diff --git a/PHDemo/PHDemo/AlertVC.swift b/PHDemo/PHDemo/AlertVC.swift
index d33ba3d..54fa2a3 100644
--- a/PHDemo/PHDemo/AlertVC.swift
+++ b/PHDemo/PHDemo/AlertVC.swift
@@ -29,14 +29,15 @@ class AlertVC: ListVC {
         
         list.add(title: "纯文字") { section in
             section.add(title: "只有一句话") {
-                Alert(.message("只有一句话").duration(2))
+                // Alert(.message("只有一句话").duration(2))
+                // 可以简写成这样：
+                Alert("只有一句话")
             }
             section.add(title: "标题 + 正文") {
                 let title = "这是标题"
                 let message = "这是正文，文字支持自动换行，可设置最小宽度和最大宽度。这个弹窗将会持续4秒。"
                 Alert { alert in
-                    alert.vm = .title(title).message(message)
-                    alert.vm.duration = 4
+                    alert.vm = .title(title).message(message).duration(4)
                 }
             }
         }
@@ -62,9 +63,9 @@ class AlertVC: ListVC {
             }
             section.add(title: "图标 + 标题 + 正文") {
                 Alert(.error) { alert in
-                    alert.vm.title = "加载失败"
-                    alert.vm.message = "请稍后重试"
-                    alert.vm.duration = 3
+                    alert.vm?.title = "加载失败"
+                    alert.vm?.message = "请稍后重试"
+                    alert.vm?.duration = 3
                 }
             }
         }
@@ -81,7 +82,7 @@ class AlertVC: ListVC {
                     alert.config.customButton { button in
                         button.titleLabel?.font = .systemFont(ofSize: 15)
                     }
-                    alert.vm.title = "你正在使用移动网络观看"
+                    alert.title = "你正在使用移动网络观看"
                     alert.onViewDidLoad { vc in
                         guard let alert = vc as? AlertTarget else {
                             return
@@ -111,7 +112,7 @@ class AlertVC: ListVC {
                     alert.config.customButton { button in
                         button.titleLabel?.font = .systemFont(ofSize: 15)
                     }
-                    alert.vm.message = "为了维护社区氛围，上麦用户需进行主播认证"
+                    alert.vm?.message = "为了维护社区氛围，上麦用户需进行主播认证"
                     alert.onViewDidLoad { vc in
                         guard let alert = vc as? AlertTarget else {
                             return
@@ -141,7 +142,7 @@ class AlertVC: ListVC {
                     alert.config.customButton { button in
                         button.titleLabel?.font = .systemFont(ofSize: 15)
                     }
-                    alert.vm.message = "本次消费需要你支付999软妹豆，确认支付吗？"
+                    alert.vm?.message = "本次消费需要你支付999软妹豆，确认支付吗？"
                     alert.config.customActionStack { stack in
                         stack.spacing = 0
                         stack.axis = .vertical // 竖排按钮
@@ -187,15 +188,15 @@ class AlertVC: ListVC {
             
             section.add(title: "只有一段文字 + 按钮") {
                 Alert { alert in
-                    alert.vm.title = "只有一段文字"
+                    alert.title = "只有一段文字"
                     alert.add(action: "取消", style: .gray)
                     alert.add(action: "默认按钮")
                 }
             }
             section.add(title: "标题 + 正文 + 按钮") {
                 Alert { alert in
-                    alert.vm.title = "标题"
-                    alert.vm.message = "这是一段正文，长度超出最大宽度时会自动换行"
+                    alert.vm?.title = "标题"
+                    alert.vm?.message = "这是一段正文，长度超出最大宽度时会自动换行"
                     alert.add(action: "取消", style: .gray)
                     alert.add(action: "删除", style: .destructive) { alert in
                         // 自定义了按钮事件之后，需要手动pop弹窗
@@ -229,8 +230,8 @@ class AlertVC: ListVC {
             }
             section.add(title: "确认删除") {
                 Alert(.delete) { alert in
-                    alert.vm.title = "确认删除"
-                    alert.vm.message = "此操作无法撤销"
+                    alert.vm?.title = "确认删除"
+                    alert.vm?.message = "此操作无法撤销"
                     alert.add(action: "取消", style: .gray)
                     alert.add(action: "删除", style: .destructive)
                 }
@@ -239,7 +240,7 @@ class AlertVC: ListVC {
         list.add(title: "控件管理") { section in
             section.add(title: "按钮增删改查") {
                 Alert(.note) { alert in
-                    alert.vm.message = "可以动态增加、删除按钮"
+                    alert.vm?.message = "可以动态增加、删除按钮"
                     alert.add(action: "在底部增加按钮", style: .filled(color: .systemGreen)) { alert in
                         alert.add(action: "哈哈1", identifier: "haha1")
                     }
@@ -265,36 +266,34 @@ class AlertVC: ListVC {
                 }
             }
             section.add(title: "更新文字") {
-                Alert(.note) { alert in
-                    alert.vm.message = "可以动态增加、删除、更新文字"
+                Alert(.note.message("可以动态增加、删除、更新文字")) { alert in
                     alert.add(action: "增加标题") { alert in
-                        alert.vm.title = "这是标题"
+                        alert.vm?.title = "这是标题"
                         alert.reloadTextStack()
                     }
                     alert.add(action: "增加正文") { alert in
-                        alert.vm.message = "可以动态增加、删除、更新文字"
+                        alert.vm?.message = "可以动态增加、删除、更新文字"
                         alert.reloadTextStack()
                     }
                     alert.add(action: "删除标题", style: .destructive) { alert in
-                        alert.vm.title = nil
+                        alert.vm?.title = nil
                         alert.reloadTextStack()
                     }
                     alert.add(action: "删除正文", style: .destructive) { alert in
-                        alert.vm.message = nil
+                        alert.vm?.message = nil
                         alert.reloadTextStack()
                     }
                     alert.add(action: "取消", style: .gray)
                 }
             }
             section.add(title: "在弹出过程中增加元素") {
-                Alert(.loading) { alert in
-                    alert.vm.title = "在弹出过程中增加元素"
+                Alert(.loading.title("在弹出过程中增加元素")) { alert in
                     alert.add(action: "OK", style: .gray)
                     alert.onViewWillAppear { vc in
                         guard let alert = vc as? AlertTarget else {
                             return
                         }
-                        alert.vm.message = "这是一段后增加的文字\n动画效果会有细微差别"
+                        alert.vm?.message = "这是一段后增加的文字\n动画效果会有细微差别"
                         alert.reloadTextStack()
                     }
                 }
@@ -304,8 +303,8 @@ class AlertVC: ListVC {
             section.add(title: "多层级弹窗") {
                 func f(i: Int) {
                     Alert { alert in
-                        alert.vm.title = "第\(i)次弹"
-                        alert.vm.message = "每次都是一个新的实例覆盖在上一个弹窗上面，而背景不会叠加变深。"
+                        alert.vm?.title = "第\(i)次弹"
+                        alert.vm?.message = "每次都是一个新的实例覆盖在上一个弹窗上面，而背景不会叠加变深。"
                         alert.add(action: "取消", style: .gray)
                         alert.add(action: "增加一个") { alert in
                             f(i: i + 1)
@@ -357,7 +356,7 @@ class AlertVC: ListVC {
         list.add(title: "自定义视图") { section in
             section.add(title: "自定义控件") {
                 Alert { alert in
-                    alert.vm.title = "自定义控件"
+                    alert.title = "自定义控件"
                     // 图片
                     let imgv = UIImageView(image: UIImage(named: "landscape"))
                     imgv.contentMode = .scaleAspectFill
diff --git a/PHDemo/PHDemo/CapsuleVC.swift b/PHDemo/PHDemo/CapsuleVC.swift
index 335d72f..271cb20 100644
--- a/PHDemo/PHDemo/CapsuleVC.swift
+++ b/PHDemo/PHDemo/CapsuleVC.swift
@@ -17,12 +17,15 @@ class CapsuleVC: ListVC {
         header.detailLabel.text = "状态胶囊控件，用于状态显示，一个主程序窗口每个位置（上中下）各自最多只有一个状态胶囊实例。"
         
         CapsuleConfiguration.global { config in
+            config.defaultDuration = 3 // 默认的持续时间
 //            config.cardCornerRadius = .infinity // 设置一个较大的数字就会变成胶囊形状
         }
         list.add(title: "默认布局：纯文字") { section in
             section.add(title: "一条简短的消息") {
                 // 设置vm或者handler都会自动push，这里测试传入vm：
-                Capsule(.message("一条简短消息"))
+                // Capsule(.message("一条简短消息"))
+                // 如果只有一条文字信息，可以直接传字符串：
+                Capsule("一条简短消息")
             }
             section.add(title: "一条稍微长一点的消息") {
                 // 设置vm或者handler都会自动push，这里测试传入handler：
@@ -31,12 +34,14 @@ class CapsuleVC: ListVC {
                     capsule.vm = .message("一条稍微长一点的消息")
                 }
             }
-            section.add(title: "（默认）状态胶囊控件，用于状态显示，一个主程序窗口只有一个状态胶囊实例。") {
+            section.add(title: "延迟显示") {
                 // 也可以创建一个空白实例，在需要的时候再push
                 let obj = Capsule().target
                 obj.vm = .message("状态胶囊控件，用于状态显示，一个主程序窗口只有一个状态胶囊实例。")
                 // ... 在需要的时候手动push
-                obj.push()
+                DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
+                    obj.push()
+                }
             }
             section.add(title: "（限制1行）状态胶囊控件，用于状态显示，一个主程序窗口只有一个状态胶囊实例。") {
                 // 同时设置vm和handler也可以
@@ -146,7 +151,7 @@ class CapsuleVC: ListVC {
 
 }
 
-extension CapsuleTarget.ViewModel {
+extension CapsuleViewModel {
     
     static func info(_ text: String?) -> Self {
         .init()
diff --git a/PHDemo/PHDemo/SheetVC.swift b/PHDemo/PHDemo/SheetVC.swift
index e368553..ec62d7e 100644
--- a/PHDemo/PHDemo/SheetVC.swift
+++ b/PHDemo/PHDemo/SheetVC.swift
@@ -25,7 +25,7 @@ class SheetVC: ListVC {
                     sheet.add(spacing: 24)
                     sheet.add(action: "确认", style: .destructive) { sheet in
                         Alert(.confirm) { alert in
-                            alert.vm.title = "处理点击事件"
+                            alert.title = "处理点击事件"
                             alert.add(action: "我知道了")
                         }
                     }
@@ -74,12 +74,11 @@ class SheetVC: ListVC {
                     sheet.add(action: "确认")
                     sheet.add(action: "取消", style: .gray)
                     sheet.onTappedBackground { sheet in
-                        print("点击了背景")
                         Toast.lazyPush(identifier: "alert") { toast in
                             toast.vm = .error
-                            toast.vm.title = "点击了背景"
-                            toast.vm.message = "点击背景将不会dismiss，必须在下方做出选择才能关掉"
-                            toast.vm.duration = 2
+                                .title("点击了背景")
+                                .message("点击背景将不会dismiss，必须在下方做出选择才能关掉")
+                                .duration(2)
                         }
                     }
                 }
diff --git a/PHDemo/PHDemo/ToastVC.swift b/PHDemo/PHDemo/ToastVC.swift
index 6c51fab..1a515c3 100644
--- a/PHDemo/PHDemo/ToastVC.swift
+++ b/PHDemo/PHDemo/ToastVC.swift
@@ -39,7 +39,10 @@ class TestToastTarget: ToastTarget {
     }
 }
 
-typealias TestToast = HUDProvider<ToastViewModel, TestToastTarget>
+//typealias TestToast = HUDProvider<ToastViewModel, TestToastTarget>
+class TestToast: ToastProvider {
+    typealias Target = TestToastTarget
+}
 
 class ToastVC: ListVC {
 
@@ -54,6 +57,7 @@ class ToastVC: ListVC {
         header.detailLabel.text = message
         
         ToastConfiguration.global { config in
+            config.defaultDuration = 5
             config.contentViewMask { mask in
                 mask.backgroundColor = .clear
                 mask.effect = UIBlurEffect(style: .systemChromeMaterial)
@@ -68,7 +72,9 @@ class ToastVC: ListVC {
                 TestToast(.title(title).message(message))
             }
             section.add(title: "一段长文本") {
-                Toast(.message(message))
+                // Toast(.message(message))
+                // 可以简写成这样：
+                Toast(message)
             }
             section.add(title: "图标 + 标题 + 正文") {
                 let s1 = "笑容正在加载"
@@ -80,8 +86,10 @@ class ToastVC: ListVC {
                     toast.update(progress: percent)
                 } completion: {
                     toast.update { toast in
-                        toast.vm = .success(5).title("加载成功").message("这条通知5s后消失")
-                        toast.vm.icon = UIImage(named: "twemoji")
+                        toast.vm = .success(5)
+                            .title("加载成功")
+                            .message("这条通知5s后消失")
+                            .icon(.init(named: "twemoji"))
                     }
                 }
             }
@@ -119,16 +127,15 @@ class ToastVC: ListVC {
             section.add(title: "增加按钮") {
                 let title = "您收到了一条好友申请"
                 let message = "丹妮莉丝·坦格利安申请添加您为好友，是否同意？"
-                Toast(.title(title).message(message)) { toast in
+                Toast(.title(title).message(message).icon(.init(named: "avatar"))) { toast in
                     toast.isRemovable = false
-                    toast.vm.icon = UIImage(named: "avatar")
                     toast.imageView.layer.masksToBounds = true
                     toast.imageView.layer.cornerRadius = toast.config.iconSize.width / 2
                     toast.add(action: "拒绝", style: .destructive) { toast in
                         Alert.lazyPush(identifier: "Dracarys") { alert in
                             alert.vm = .message("Dracarys")
-                            alert.vm.icon = UIImage(inProHUD: "prohud.windmill")
-                            alert.vm.rotation = .init(repeatCount: .infinity)
+                                .icon(UIImage(inProHUD: "prohud.windmill"))
+                                .rotation(.init(repeatCount: .infinity))
                             alert.config.enableShadow = false
                             alert.config.contentViewMask { mask in
                                 mask.effect = .none
@@ -217,7 +224,7 @@ class ToastVC: ListVC {
             }
             section.add(title: "修改左右外边距") {
                 Toast(.message("这条toast的左右外边距经过自定义设置，与其它的有所不同。")) { toast in
-                    toast.config.windowEdgeInset = 8
+                    toast.config.marginX = 32
                     toast.config.cardCornerRadius = 24
                 }
             }
@@ -306,7 +313,7 @@ class ToastVC: ListVC {
             
             section.add(title: "卡片背景样式") {
                 Toast { toast in
-                    toast.vm.title = "卡片背景样式"
+                    toast.title = "卡片背景样式"
                     toast.add(action: "浅色毛玻璃") { toast in
                         toast.contentMaskView.effect = UIBlurEffect(style: .light)
                         toast.contentMaskView.backgroundColor = .clear
@@ -327,7 +334,7 @@ class ToastVC: ListVC {
                 func foo() {
                     Toast { toast in
                         toast.title = "共享配置"
-                        toast.vm.message = "建议在App启动后进行通用配置设置，所有实例都会先拉取通用配置为默认值，修改这些配置会影响到所有实例。"
+                        toast.vm?.message = "建议在App启动后进行通用配置设置，所有实例都会先拉取通用配置为默认值，修改这些配置会影响到所有实例。"
                         toast.add(action: "默认", style: .gray) { toast in
                             ToastConfiguration.global { config in
                                 config.customTitleLabel { titleLabel in
@@ -359,7 +366,7 @@ class ToastVC: ListVC {
 
 fileprivate func testAlert() {
     Alert { alert in
-        alert.vm.title = "处理点击事件"
+        alert.title = "处理点击事件"
         alert.add(action: "我知道了", style: .destructive)
     }
 }
diff --git a/Sources/ProHUD/Alert/AlertDefaultLayout.swift b/Sources/ProHUD/Alert/AlertDefaultLayout.swift
index 825e0f6..d0c3c2a 100644
--- a/Sources/ProHUD/Alert/AlertDefaultLayout.swift
+++ b/Sources/ProHUD/Alert/AlertDefaultLayout.swift
@@ -17,7 +17,7 @@ extension AlertTarget: DefaultLayout {
         if self.cfg.customReloadData?(self) == true {
             return
         }
-        view.tintColor = vm.tintColor ?? config.tintColor
+        view.tintColor = vm?.tintColor ?? config.tintColor
         let isFirstLayout: Bool
         if contentView.superview == nil {
             isFirstLayout = animated
@@ -126,7 +126,7 @@ extension AlertTarget: DefaultLayout {
     
     func updateTimeoutDuration() {
         // 设置持续时间
-        vm.timeoutHandler = DispatchWorkItem(block: { [weak self] in
+        vm?.timeoutHandler = DispatchWorkItem(block: { [weak self] in
             self?.pop()
         })
     }
@@ -144,9 +144,9 @@ extension AlertTarget {
         // 移除进度
         progressView?.removeFromSuperview()
         
-        if vm.icon != nil || vm.iconURL != nil {
-            imageView.image = vm.icon
-            if let iconURL = vm.iconURL {
+        if vm?.icon != nil || vm?.iconURL != nil {
+            imageView.image = vm?.icon
+            if let iconURL = vm?.iconURL {
                 config.customWebImage?(imageView, iconURL)
             }
             if imageView.superview == nil {
@@ -159,7 +159,7 @@ extension AlertTarget {
                     mk.height.equalTo(config.iconSize.height)
                 }
             }
-            if let rotation = vm.rotation {
+            if let rotation = vm?.rotation {
                 startRotate(rotation)
             }
         } else {
@@ -171,8 +171,8 @@ extension AlertTarget {
         
     }
     func setupTextStack() {
-        let titleCount = vm.title?.count ?? 0
-        let bodyCount = vm.message?.count ?? 0
+        let titleCount = vm?.title?.count ?? 0
+        let bodyCount = vm?.message?.count ?? 0
         if titleCount > 0 || bodyCount > 0 {
             if textStack.superview != contentStack {
                 if let index = contentStack.arrangedSubviews.firstIndex(of: imageView) {
@@ -189,7 +189,7 @@ extension AlertTarget {
                 }
             }
             if titleCount > 0 {
-                titleLabel.text = vm.title
+                titleLabel.text = vm?.title
                 if titleLabel.superview != textStack {
                     textStack.insertArrangedSubview(titleLabel, at: 0)
                 }
@@ -209,7 +209,7 @@ extension AlertTarget {
                 titleLabel.removeFromSuperview()
             }
             if bodyCount > 0 {
-                bodyLabel.text = vm.message
+                bodyLabel.text = vm?.message
                 if bodyLabel.superview != textStack {
                     textStack.addArrangedSubview(bodyLabel)
                 }
diff --git a/Sources/ProHUD/Alert/AlertProvider.swift b/Sources/ProHUD/Alert/AlertProvider.swift
index f97d71b..15c18c6 100644
--- a/Sources/ProHUD/Alert/AlertProvider.swift
+++ b/Sources/ProHUD/Alert/AlertProvider.swift
@@ -8,13 +8,30 @@
 import UIKit
 
 open class AlertProvider: HUDProvider<AlertViewModel, AlertTarget> {
-    @discardableResult public required init(_ vm: ViewModel?, initializer: ((_ alert: Target) -> Void)?) {
-        super.init(vm, initializer: initializer)
+    
+    public typealias ViewModel = AlertViewModel
+    public typealias Target = AlertTarget
+    
+    @discardableResult @objc public required init(initializer: ((_ alert: Target) -> Void)?) {
+        super.init(initializer: initializer)
     }
     
-    @discardableResult public required convenience init(initializer: ((_ alert: Target) -> Void)?) {
-        self.init(nil, initializer: initializer)
+    @discardableResult public convenience init(_ vm: ViewModel, initializer: ((_ alert: Target) -> Void)?) {
+        self.init { alert in
+            alert.vm = vm
+            initializer?(alert)
+        }
     }
+    /// 根据ViewModel创建一个Target并显示
+    /// - Parameter vm: 数据模型
+    @discardableResult public convenience init(_ vm: ViewModel) {
+        self.init(vm, initializer: nil)
+    }
+    
+    @discardableResult @objc public convenience init(_ text: String, duration: TimeInterval = 3) {
+        self.init(.message(text).duration(duration), initializer: nil)
+    }
+    
     
     /// 如果不存在就创建并弹出一个HUD实例，如果存在就更新实例
     /// - Parameters:
diff --git a/Sources/ProHUD/Alert/AlertTarget.swift b/Sources/ProHUD/Alert/AlertTarget.swift
index 1a520f5..57709ba 100644
--- a/Sources/ProHUD/Alert/AlertTarget.swift
+++ b/Sources/ProHUD/Alert/AlertTarget.swift
@@ -74,11 +74,15 @@ open class AlertTarget: BaseController, HUDTargetType {
     }()
     
     /// 视图模型
-    @objc public var vm: AlertViewModel = .init()
+    @objc public var vm: AlertViewModel?
     
     public override var title: String? {
         didSet {
-            vm.title = title
+            if let vm = vm {
+                vm.title = title
+            } else {
+                vm = .title(title)
+            }
         }
     }
     
diff --git a/Sources/ProHUD/Capsule/CapsuleConfiguration.swift b/Sources/ProHUD/Capsule/CapsuleConfiguration.swift
index 35e03b6..608e3a7 100644
--- a/Sources/ProHUD/Capsule/CapsuleConfiguration.swift
+++ b/Sources/ProHUD/Capsule/CapsuleConfiguration.swift
@@ -19,6 +19,9 @@ public class CapsuleConfiguration: CommonConfiguration {
         customGlobalConfig = callback
     }
     
+    /// 默认的持续时间
+    public var defaultDuration: TimeInterval = 3
+    
     override var cardCornerRadiusByDefault: CGFloat {
         cardCornerRadius ?? 16
     }
diff --git a/Sources/ProHUD/Capsule/CapsuleDefaultLayout.swift b/Sources/ProHUD/Capsule/CapsuleDefaultLayout.swift
index fff99ef..05aa75b 100644
--- a/Sources/ProHUD/Capsule/CapsuleDefaultLayout.swift
+++ b/Sources/ProHUD/Capsule/CapsuleDefaultLayout.swift
@@ -18,7 +18,7 @@ extension CapsuleTarget: DefaultLayout {
             return
         }
         
-        view.tintColor = vm.tintColor ?? config.tintColor
+        view.tintColor = vm?.tintColor ?? config.tintColor
         
         // content
         loadContentViewIfNeeded()
@@ -29,7 +29,7 @@ extension CapsuleTarget: DefaultLayout {
         
         // text
         textLabel.removeFromSuperview()
-        var text = [vm.title ?? "", vm.message ?? ""].filter({ $0.count > 0 }).joined(separator: " ")
+        var text = [vm?.title ?? "", vm?.message ?? ""].filter({ $0.count > 0 }).joined(separator: " ")
         if text.count > 0 {
             contentStack.addArrangedSubview(textLabel)
             textLabel.snp.makeConstraints { make in
@@ -81,11 +81,11 @@ extension CapsuleTarget: DefaultLayout {
     
     private func updateTimeoutDuration() {
         // 为空时使用默认规则
-        if vm.duration == nil {
-            vm.duration = 3
+        if vm?.duration == nil {
+            vm?.duration = config.defaultDuration
         }
         // 设置持续时间
-        vm.timeoutHandler = DispatchWorkItem(block: { [weak self] in
+        vm?.timeoutHandler = DispatchWorkItem(block: { [weak self] in
             self?.pop()
         })
     }
@@ -99,16 +99,16 @@ extension CapsuleTarget: DefaultLayout {
         // 移除进度
         progressView?.removeFromSuperview()
         
-        if vm.icon == nil && vm.iconURL == nil {
+        if vm?.icon == nil && vm?.iconURL == nil {
             contentStack.removeArrangedSubview(imageView)
         } else {
             contentStack.insertArrangedSubview(imageView, at: 0)
         }
-        imageView.image = vm.icon
-        if let iconURL = vm.iconURL {
+        imageView.image = vm?.icon
+        if let iconURL = vm?.iconURL {
             config.customWebImage?(imageView, iconURL)
         }
-        if let rotation = vm.rotation {
+        if let rotation = vm?.rotation {
             startRotate(rotation)
         }
         
diff --git a/Sources/ProHUD/Capsule/CapsuleManager.swift b/Sources/ProHUD/Capsule/CapsuleManager.swift
index 8261eda..55e9a1f 100644
--- a/Sources/ProHUD/Capsule/CapsuleManager.swift
+++ b/Sources/ProHUD/Capsule/CapsuleManager.swift
@@ -13,7 +13,7 @@ extension CapsuleTarget {
         guard CapsuleConfiguration.isEnabled else { return }
         let isNew: Bool
         let window: CapsuleWindow
-        let position = vm.position
+        let position = vm?.position ?? .top
         
         if let w = AppContext.current?.capsuleWindows[position] {
             isNew = false
@@ -30,10 +30,10 @@ extension CapsuleTarget {
         
         // 应用到frame
         let newFrame: CGRect
-        switch vm.position {
-        case .top:
-            let topLayoutMargins = AppContext.appWindow?.layoutMargins.top ?? 8
-            let y = max(topLayoutMargins - 8, 8)
+        switch vm?.position {
+        case .top, .none:
+            let topLayoutMargins = AppContext.appWindow?.safeAreaInsets.top ?? 8
+            let y = max(topLayoutMargins, 8)
             newFrame = .init(x: (AppContext.appBounds.width - size.width) / 2, y: y, width: size.width, height: size.height)
         case .middle:
             newFrame = .init(x: (AppContext.appBounds.width - size.width) / 2, y: (AppContext.appBounds.height - size.height) / 2 - 20, width: size.width, height: size.height)
@@ -60,6 +60,10 @@ extension CapsuleTarget {
             AppContext.capsuleWindows[s]?[position] = window
         }
         navEvents[.onViewWillAppear]?(self)
+        
+        // 更新toast防止重叠
+        ToastWindow.updateToastWindowsLayout()
+        
         if isNew {
             window.isHidden = false
             func completion() {
@@ -116,8 +120,11 @@ extension CapsuleTarget {
     
     @objc open func pop() {
         guard let window = attachedWindow, let windowScene = windowScene else { return }
-        AppContext.capsuleWindows[windowScene]?[vm.position] = nil
+        AppContext.capsuleWindows[windowScene]?[vm?.position ?? .top] = nil
         navEvents[.onViewWillDisappear]?(self)
+        // 更新toast防止重叠
+        ToastWindow.updateToastWindowsLayout()
+        
         func completion() {
             window.isHidden = true
             window.transform = .identity
@@ -128,8 +135,8 @@ extension CapsuleTarget {
         } else {
             let duration = config.animateDurationForBuildOutByDefault
             let oldFrame = window.frame
-            switch vm.position {
-            case .top:
+            switch vm?.position {
+            case .top, .none:
                 UIView.animateEaseOut(duration: duration) {
                     window.transform = .init(translationX: 0, y: -oldFrame.maxY - 20)
                 } completion: { done in
diff --git a/Sources/ProHUD/Capsule/CapsuleProvider.swift b/Sources/ProHUD/Capsule/CapsuleProvider.swift
index 1a0bd9a..fa8e969 100644
--- a/Sources/ProHUD/Capsule/CapsuleProvider.swift
+++ b/Sources/ProHUD/Capsule/CapsuleProvider.swift
@@ -7,20 +7,37 @@
 
 import UIKit
 
-open class CapsuleProvider: HUDProvider<CapsuleTarget.ViewModel, CapsuleTarget> {
+open class CapsuleProvider: HUDProvider<CapsuleViewModel, CapsuleTarget> {
+    
+    public typealias ViewModel = CapsuleViewModel
+    public typealias Target = CapsuleTarget
+    
+    @discardableResult @objc public required init(initializer: ((_ capsule: Target) -> Void)?) {
+        super.init(initializer: initializer)
+    }
     
     /// 根据ViewModel和自定义的初始化代码创建一个Target并显示
     /// - Parameters:
     ///   - vm: 数据模型
     ///   - initializer: 初始化代码
-    @discardableResult public required init(_ vm: ViewModel?, initializer: ((_ capsule: Target) -> Void)?) {
-        super.init(vm, initializer: initializer)
+    @discardableResult public convenience init(_ vm: ViewModel, initializer: ((_ capsule: Target) -> Void)?) {
+        self.init { capsule in
+            capsule.vm = vm
+            initializer?(capsule)
+        }
     }
     
-    @discardableResult public required convenience init(initializer: ((_ capsule: Target) -> Void)?) {
-        self.init(nil, initializer: initializer)
+    /// 根据ViewModel创建一个Target并显示
+    /// - Parameter vm: 数据模型
+    @discardableResult public convenience init(_ vm: ViewModel) {
+        self.init(vm, initializer: nil)
     }
     
+    @discardableResult public convenience init(_ text: String) {
+        self.init(.message(text), initializer: nil)
+    }
+    
+    
     /// 如果不存在就创建并弹出一个HUD实例，如果存在就更新实例
     /// - Parameters:
     ///   - identifier: 实例唯一标识符（如果为空，则以代码位置为唯一标识符）
diff --git a/Sources/ProHUD/Capsule/CapsuleTarget.swift b/Sources/ProHUD/Capsule/CapsuleTarget.swift
index ff465f3..dc56c33 100644
--- a/Sources/ProHUD/Capsule/CapsuleTarget.swift
+++ b/Sources/ProHUD/Capsule/CapsuleTarget.swift
@@ -46,7 +46,17 @@ open class CapsuleTarget: BaseController, HUDTargetType {
         return lb
     }()
     
-    public var vm: CapsuleViewModel = .init()
+    public var vm: CapsuleViewModel?
+    
+    public override var title: String? {
+        didSet {
+            if let vm = vm {
+                vm.title = title
+            } else {
+                vm = .title(title)
+            }
+        }
+    }
     
     private var tapActionCallback: ((_ capsule: CapsuleTarget) -> Void)?
     
diff --git a/Sources/ProHUD/Capsule/CapsuleWindow.swift b/Sources/ProHUD/Capsule/CapsuleWindow.swift
index 3d986f4..fea0a79 100644
--- a/Sources/ProHUD/Capsule/CapsuleWindow.swift
+++ b/Sources/ProHUD/Capsule/CapsuleWindow.swift
@@ -15,8 +15,8 @@ class CapsuleWindow: Window {
         self.capsule = capsule
         super.init(frame: .zero)
         windowScene = AppContext.windowScene
-        switch capsule.vm.position {
-        case .top:
+        switch capsule.vm?.position {
+        case .top, .none:
             // 略高于toast
             windowLevel = .phCapsuleTop
         case .middle:
diff --git a/Sources/ProHUD/Core/Protocols/Provider.swift b/Sources/ProHUD/Core/Protocols/Provider.swift
index 7246a4a..b25c7cb 100644
--- a/Sources/ProHUD/Core/Protocols/Provider.swift
+++ b/Sources/ProHUD/Core/Protocols/Provider.swift
@@ -12,11 +12,9 @@ public protocol HUDProviderType {
     associatedtype ViewModel = HUDViewModelType
     associatedtype Target = HUDTargetType
     
-    /// 根据ViewModel和自定义的初始化代码创建一个Target并显示
-    /// - Parameters:
-    ///   - vm: 数据模型
-    ///   - initializer: 初始化代码
-    @discardableResult init(_ vm: ViewModel?, initializer: ((_ target: Target) -> Void)?)
+    /// 根据自定义的初始化代码创建一个Target并显示
+    /// - Parameter initializer: 初始化代码
+    @discardableResult init(initializer: ((_ target: Target) -> Void)?)
     
 }
 
@@ -25,39 +23,22 @@ open class HUDProvider<ViewModel: HUDViewModelType, Target: HUDTargetType>: HUDP
     /// HUD实例
     public var target: Target
     
-    /// 根据ViewModel和自定义的初始化代码创建一个Target并显示
-    /// - Parameters:
-    ///   - vm: 数据模型
-    ///   - initializer: 初始化代码
-    @discardableResult public required init(_ vm: ViewModel?, initializer: ((_ target: Target) -> Void)?) {
+    /// 根据自定义的初始化代码创建一个Target并显示
+    /// - Parameter initializer: 初始化代码
+    @discardableResult public required init(initializer: ((_ target: Target) -> Void)?) {
         var t = Target()
-        if let vm = vm as? Target.ViewModel {
-            t.vm = vm
-        }
         initializer?(t)
         self.target = t
-        if (vm == nil && initializer == nil) == false {
+        if (t.vm == nil && initializer == nil) == false {
             DispatchQueue.main.async {
                 t.push()
             }
         }
     }
     
-    /// 根据自定义的初始化代码创建一个Target并显示
-    /// - Parameter initializer: 初始化代码
-    @discardableResult public convenience init(initializer: ((_ target: Target) -> Void)?) {
-        self.init(nil, initializer: initializer)
-    }
-    
-    /// 根据ViewModel创建一个Target并显示
-    /// - Parameter vm: 数据模型
-    @discardableResult public convenience init(_ vm: ViewModel?) {
-        self.init(vm, initializer: nil)
-    }
-    
     /// 创建一个空白的实例，不立即显示，需要手动调用target.push()来显示
     @discardableResult public convenience init() {
-        self.init(nil, initializer: nil)
+        self.init(initializer: nil)
     }
     
     
diff --git a/Sources/ProHUD/Core/Protocols/Target.swift b/Sources/ProHUD/Core/Protocols/Target.swift
index 82749e2..db3ec52 100644
--- a/Sources/ProHUD/Core/Protocols/Target.swift
+++ b/Sources/ProHUD/Core/Protocols/Target.swift
@@ -14,6 +14,6 @@ import UIKit
 
 public protocol HUDTargetType: HUDControllerType {
     associatedtype ViewModel = HUDViewModelType
-    var vm: ViewModel { get set }
+    var vm: ViewModel? { get set }
     init()
 }
diff --git a/Sources/ProHUD/Core/Utils/AppContext.swift b/Sources/ProHUD/Core/Utils/AppContext.swift
index 6db9658..88c1230 100644
--- a/Sources/ProHUD/Core/Utils/AppContext.swift
+++ b/Sources/ProHUD/Core/Utils/AppContext.swift
@@ -36,7 +36,7 @@ public struct AppContext {
     static var toastWindows: [UIWindowScene: [ToastWindow]] = [:]
     static var alertWindow: [UIWindowScene: AlertWindow] = [:]
     static var sheetWindows: [UIWindowScene: [SheetWindow]] = [:]
-    static var capsuleWindows: [UIWindowScene: [CapsuleTarget.ViewModel.Position: CapsuleWindow]] = [:]
+    static var capsuleWindows: [UIWindowScene: [CapsuleViewModel.Position: CapsuleWindow]] = [:]
     
     static var current: AppContext? {
         guard let windowScene = windowScene else { return nil }
@@ -120,7 +120,7 @@ extension AppContext {
     var toastWindows: [ToastWindow] {
         Self.toastWindows[windowScene] ?? []
     }
-    var capsuleWindows: [CapsuleTarget.ViewModel.Position: CapsuleWindow] {
+    var capsuleWindows: [CapsuleViewModel.Position: CapsuleWindow] {
         Self.capsuleWindows[windowScene] ?? [:]
     }
 }
diff --git a/Sources/ProHUD/Sheet/SheetDefaultLayout.swift b/Sources/ProHUD/Sheet/SheetDefaultLayout.swift
index 15a89e3..6b34277 100644
--- a/Sources/ProHUD/Sheet/SheetDefaultLayout.swift
+++ b/Sources/ProHUD/Sheet/SheetDefaultLayout.swift
@@ -17,7 +17,7 @@ extension SheetTarget: DefaultLayout {
         if self.cfg.customReloadData?(self) == true {
             return
         }
-        view.tintColor = vm.tintColor ?? config.tintColor
+        view.tintColor = vm?.tintColor ?? config.tintColor
         // background
         if backgroundView.superview == nil {
             view.insertSubview(backgroundView, at: 0)
diff --git a/Sources/ProHUD/Sheet/SheetProvider.swift b/Sources/ProHUD/Sheet/SheetProvider.swift
index 8e5a9ec..dd15e43 100644
--- a/Sources/ProHUD/Sheet/SheetProvider.swift
+++ b/Sources/ProHUD/Sheet/SheetProvider.swift
@@ -8,12 +8,12 @@
 import UIKit
 
 open class SheetProvider: HUDProvider<SheetViewModel, SheetTarget> {
-    @discardableResult public required init(_ vm: ViewModel?, initializer: ((_ sheet: Target) -> Void)?) {
-        super.init(vm, initializer: initializer)
-    }
     
-    @discardableResult public required convenience init(initializer: ((_ sheet: Target) -> Void)?) {
-        self.init(nil, initializer: initializer)
+    public typealias ViewModel = SheetViewModel
+    public typealias Target = SheetTarget
+    
+    @discardableResult @objc public required init(initializer: ((_ sheet: Target) -> Void)?) {
+        super.init(initializer: initializer)
     }
     
     /// 如果不存在就创建并弹出一个HUD实例，如果存在就更新实例
diff --git a/Sources/ProHUD/Sheet/SheetTarget.swift b/Sources/ProHUD/Sheet/SheetTarget.swift
index 738455a..5fc245f 100644
--- a/Sources/ProHUD/Sheet/SheetTarget.swift
+++ b/Sources/ProHUD/Sheet/SheetTarget.swift
@@ -41,7 +41,7 @@ open class SheetTarget: BaseController, HUDTargetType {
         }
     }
     
-    public var vm: SheetViewModel = .init()
+    public var vm: SheetViewModel? = nil
     
     required public override init() {
         super.init()
diff --git a/Sources/ProHUD/Toast/ToastConfiguration.swift b/Sources/ProHUD/Toast/ToastConfiguration.swift
index 7ac28e1..d9f34f5 100644
--- a/Sources/ProHUD/Toast/ToastConfiguration.swift
+++ b/Sources/ProHUD/Toast/ToastConfiguration.swift
@@ -9,16 +9,6 @@ import UIKit
 
 public class ToastConfiguration: CommonConfiguration {
     
-    /// 元素与元素之间的距离
-    public var margin = CGFloat(8)
-    
-    var customInfoStack: ((_ stack: StackView) -> Void)?
-    public func customInfoStack(handler: @escaping (_ stack: StackView) -> Void) {
-        customInfoStack = handler
-    }
-    /// 行间距
-    public var lineSpace = CGFloat(4)
-    
     static var customGlobalConfig: ((_ config: ToastConfiguration) -> Void)?
     
     /// 全局共享配置（只能设置一次，影响所有实例）
@@ -27,11 +17,21 @@ public class ToastConfiguration: CommonConfiguration {
         customGlobalConfig = callback
     }
     
-    /// 距离窗口左右的间距
-    public var windowEdgeInset: CGFloat?
-    var windowEdgeInsetByDefault: CGFloat {
-        windowEdgeInset ?? 16
+    /// 默认的持续时间
+    public var defaultDuration: TimeInterval = 10
+    
+    /// 元素与左右屏幕之间的距离（在没有达到最大宽度的情况下）
+    public var marginX = CGFloat(8)
+    
+    /// 元素与元素之间的纵向距离
+    public var marginY = CGFloat(8)
+    
+    var customInfoStack: ((_ stack: StackView) -> Void)?
+    public func customInfoStack(handler: @escaping (_ stack: StackView) -> Void) {
+        customInfoStack = handler
     }
+    /// 行间距
+    public var lineSpace = CGFloat(4)
     
     override var cardMaxWidthByDefault: CGFloat {
         cardMaxWidth ?? 500
diff --git a/Sources/ProHUD/Toast/ToastDefaultLayout.swift b/Sources/ProHUD/Toast/ToastDefaultLayout.swift
index 7c9f543..4e6decb 100644
--- a/Sources/ProHUD/Toast/ToastDefaultLayout.swift
+++ b/Sources/ProHUD/Toast/ToastDefaultLayout.swift
@@ -17,7 +17,7 @@ extension ToastTarget: DefaultLayout {
         if self.cfg.customReloadData?(self) == true {
             return
         }
-        view.tintColor = vm.tintColor ?? config.tintColor
+        view.tintColor = vm?.tintColor ?? config.tintColor
         loadContentViewIfNeeded()
         loadContentMaskViewIfNeeded()
         guard customView == nil else {
@@ -26,7 +26,7 @@ extension ToastTarget: DefaultLayout {
             }
             return
         }
-        if vm.icon != nil || vm.iconURL != nil {
+        if vm?.icon != nil || vm?.iconURL != nil {
             if imageView.superview == nil {
                 infoStack.insertArrangedSubview(imageView, at: 0)
                 imageView.snp.makeConstraints { make in
@@ -42,8 +42,8 @@ extension ToastTarget: DefaultLayout {
         if textStack.superview == nil {
             infoStack.addArrangedSubview(textStack)
         }
-        let titleCount = vm.title?.count ?? 0
-        let bodyCount = vm.message?.count ?? 0
+        let titleCount = vm?.title?.count ?? 0
+        let bodyCount = vm?.message?.count ?? 0
         if titleCount > 0 {
             textStack.insertArrangedSubview(titleLabel, at: 0)
             if bodyCount > 0 {
@@ -79,14 +79,12 @@ extension ToastTarget: DefaultLayout {
             bodyLabel.removeFromSuperview()
         }
         // 设置数据
-        titleLabel.text = vm.title
-        bodyLabel.text = vm.message
+        titleLabel.text = vm?.title
+        bodyLabel.text = vm?.message
         view.layoutIfNeeded()
         
         // 设置持续时间
-        vm.timeoutHandler = DispatchWorkItem(block: { [weak self] in
-            self?.pop()
-        })
+        updateTimeoutDuration()
         
         setupImageView()
         
@@ -132,6 +130,17 @@ extension ToastTarget {
         }
     }
     
+    private func updateTimeoutDuration() {
+        // 为空时使用默认规则
+        if vm?.duration == nil {
+            vm?.duration = config.defaultDuration
+        }
+        // 设置持续时间
+        vm?.timeoutHandler = DispatchWorkItem(block: { [weak self] in
+            self?.pop()
+        })
+    }
+    
     func setupImageView() {
         // 移除动画
         stopRotate(animateLayer)
@@ -141,11 +150,11 @@ extension ToastTarget {
         // 移除进度
         progressView?.removeFromSuperview()
         
-        imageView.image = vm.icon
-        if let iconURL = vm.iconURL {
+        imageView.image = vm?.icon
+        if let iconURL = vm?.iconURL {
             config.customWebImage?(imageView, iconURL)
         }
-        if let rotation = vm.rotation {
+        if let rotation = vm?.rotation {
             startRotate(rotation)
         }
         
diff --git a/Sources/ProHUD/Toast/ToastManager.swift b/Sources/ProHUD/Toast/ToastManager.swift
index 631589e..52b31f7 100644
--- a/Sources/ProHUD/Toast/ToastManager.swift
+++ b/Sources/ProHUD/Toast/ToastManager.swift
@@ -50,7 +50,7 @@ extension ToastTarget {
         
         // frame
         let cardEdgeInsets = config.cardEdgeInsetsByDefault
-        let width = CGFloat.minimum(AppContext.appBounds.width - config.windowEdgeInsetByDefault - config.windowEdgeInsetByDefault, config.cardMaxWidthByDefault)
+        let width = CGFloat.minimum(AppContext.appBounds.width - config.marginX - config.marginX, config.cardMaxWidthByDefault)
         view.frame.size = CGSize(width: width, height: config.cardMaxHeightByDefault)
         titleLabel.sizeToFit()
         bodyLabel.sizeToFit()
@@ -92,7 +92,7 @@ extension ToastTarget {
         } else {
             consolePrint("‼️代码漏洞：已经没有toast了")
         }
-        vm.duration = nil
+        vm?.duration = nil
         setContextWindows(windows)
         UIView.animateEaseOut(duration: config.animateDurationForBuildOutByDefault) {
             window.transform = .init(translationX: 0, y: 0-20-window.maxY)
@@ -124,21 +124,34 @@ fileprivate var updateToastsLayoutWorkItem: DispatchWorkItem?
 fileprivate extension ToastWindow {
     
     static func setToastWindowsLayout(windows: [ToastWindow]) {
+        var windows: [Window] = windows
+        if let win = AppContext.current?.capsuleWindows[.top] {
+            windows.insert(win, at: 0)
+        }
         for (i, window) in windows.enumerated() {
-            let config = window.toast.config
+            let margin: CGFloat
+            if let window = window as? ToastWindow {
+                margin = window.toast.config.marginY
+            } else if let window = window as? CapsuleWindow {
+                margin = window.safeAreaInsets.top
+            } else {
+                margin = 8
+            }
             var y = window.frame.origin.y
             if i == 0 {
-                let topLayoutMargins = AppContext.appWindow?.layoutMargins.top ?? config.margin
-                y = max(topLayoutMargins - config.margin, config.margin)
+                let topLayoutMargins = AppContext.appWindow?.safeAreaInsets.top ?? margin
+                y = max(topLayoutMargins, margin)
             } else {
                 if i - 1 < windows.count && i > 0 {
-                    y = config.margin + windows[i-1].frame.maxY
+                    y = margin + windows[i-1].frame.maxY
                 } else {
-                    y = config.margin
+                    y = margin
                 }
             }
-            window.maxY = y + window.frame.size.height
-            UIView.animateEaseOut(duration: config.animateDurationForReloadByDefault) {
+            if let window = window as? ToastWindow {
+                window.maxY = y + window.frame.size.height
+            }
+            UIView.animateEaseOut(duration: 0.68) {
                 window.frame.origin.y = y
             }
         }
@@ -154,3 +167,10 @@ fileprivate extension ToastWindow {
     }
     
 }
+
+extension ToastWindow {
+    static func updateToastWindowsLayout() {
+        let wins = AppContext.current?.toastWindows ?? []
+        updateToastWindowsLayout(windows: wins)
+    }
+}
diff --git a/Sources/ProHUD/Toast/ToastProvider.swift b/Sources/ProHUD/Toast/ToastProvider.swift
index b726549..e1c2c22 100644
--- a/Sources/ProHUD/Toast/ToastProvider.swift
+++ b/Sources/ProHUD/Toast/ToastProvider.swift
@@ -8,19 +8,37 @@
 import UIKit
 
 open class ToastProvider: HUDProvider<ToastViewModel, ToastTarget> {
-    @discardableResult public required init(_ vm: ViewModel?, initializer: ((_ toast: Target) -> Void)?) {
-        super.init(vm, initializer: initializer)
+    
+    public typealias ViewModel = ToastViewModel
+    public typealias Target = ToastTarget
+    
+    @discardableResult @objc public required init(initializer: ((_ toast: Target) -> Void)?) {
+        super.init(initializer: initializer)
     }
     
-    @discardableResult public required convenience init(initializer: ((_ toast: Target) -> Void)?) {
-        self.init(nil, initializer: initializer)
+    @discardableResult public convenience init(_ vm: ViewModel, initializer: ((_ toast: Target) -> Void)?) {
+        self.init { toast in
+            toast.vm = vm
+            initializer?(toast)
+        }
     }
     
+    /// 根据ViewModel创建一个Target并显示
+    /// - Parameter vm: 数据模型
+    @discardableResult public convenience init(_ vm: ViewModel) {
+        self.init(vm, initializer: nil)
+    }
+    
+    @discardableResult @objc public convenience init(_ text: String) {
+        self.init(.message(text), initializer: nil)
+    }
+    
+    
     /// 如果不存在就创建并弹出一个HUD实例，如果存在就更新实例
     /// - Parameters:
     ///   - identifier: 实例唯一标识符（如果为空，则以代码位置为唯一标识符）
     ///   - handler: 实例创建代码
-    public static func lazyPush(identifier: String? = nil, file: String = #file, line: Int = #line, handler: @escaping (_ toast: ToastTarget) -> Void, onExists: ((_ toast: ToastTarget) -> Void)? = nil) {
+    @objc public static func lazyPush(identifier: String? = nil, file: String = #file, line: Int = #line, handler: @escaping (_ toast: ToastTarget) -> Void, onExists: ((_ toast: ToastTarget) -> Void)? = nil) {
         let id = identifier ?? (file + "#\(line)")
         if let vc = find(identifier: id).last {
             vc.update(handler: onExists ?? handler)
@@ -35,7 +53,7 @@ open class ToastProvider: HUDProvider<ToastViewModel, ToastTarget> {
     /// 查找HUD实例
     /// - Parameter identifier: 唯一标识符
     /// - Returns: HUD实例
-    @discardableResult public static func find(identifier: String, update handler: ((_ toast: ToastTarget) -> Void)? = nil) -> [ToastTarget] {
+    @discardableResult @objc public static func find(identifier: String, update handler: ((_ toast: ToastTarget) -> Void)? = nil) -> [ToastTarget] {
         let arr = AppContext.toastWindows.values.flatMap({ $0 }).compactMap({ $0.toast }).filter({ $0.identifier == identifier })
         if let handler = handler {
             arr.forEach({ $0.update(handler: handler) })
diff --git a/Sources/ProHUD/Toast/ToastTarget.swift b/Sources/ProHUD/Toast/ToastTarget.swift
index b94dd70..9b875d9 100644
--- a/Sources/ProHUD/Toast/ToastTarget.swift
+++ b/Sources/ProHUD/Toast/ToastTarget.swift
@@ -84,14 +84,17 @@ open class ToastTarget: BaseController, HUDTargetType {
     public var isRemovable = true
     
     /// 视图模型
-    @objc public var vm = ToastViewModel()
+    @objc public var vm: ToastViewModel?
     
     private var tapActionCallback: ((_ toast: ToastTarget) -> Void)?
     
-    
     public override var title: String? {
         didSet {
-            vm.title = title
+            if let vm = vm {
+                vm.title = title
+            } else {
+                vm = .title(title)
+            }
         }
     }
     
@@ -135,7 +138,7 @@ fileprivate extension ToastTarget {
     /// 拖拽事件
     /// - Parameter sender: 手势
     @objc func _onPanGesture(_ sender: UIPanGestureRecognizer) {
-        vm.timeoutTimer?.invalidate()
+        vm?.timeoutTimer?.invalidate()
         let point = sender.translation(in: sender.view)
         window?.transform = .init(translationX: 0, y: point.y)
         if sender.state == .recognized {
@@ -150,8 +153,8 @@ fileprivate extension ToastTarget {
             UIView.animateEaseOut(duration: config.animateDurationForReloadByDefault) {
                 self.window?.transform = .identity
             } completion: { done in
-                let d = self.vm.duration
-                self.vm.duration = d
+                let d = self.vm?.duration
+                self.vm?.duration = d
             }
         }
     }