diff --git a/PHDemo/PHDemo/DemoAlertVC.swift b/PHDemo/PHDemo/DemoAlertVC.swift
index 5518e53..330af50 100644
--- a/PHDemo/PHDemo/DemoAlertVC.swift
+++ b/PHDemo/PHDemo/DemoAlertVC.swift
@@ -110,7 +110,7 @@ class DemoAlertVC: 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.title = "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
@@ -140,7 +140,7 @@ class DemoAlertVC: 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.title = "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
@@ -193,8 +193,7 @@ class DemoAlertVC: ListVC {
             }
             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").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
@@ -301,8 +300,7 @@ class DemoAlertVC: 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").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)
@@ -338,7 +336,7 @@ class DemoAlertVC: ListVC {
                 let vc = UIViewController()
                 vc.title = "页面"
                 vc.view.backgroundColor = .systemYellow
-                let alert = Alert(.loading.title("正在加载").message("这个弹窗被放在指定容器中")).target
+                let alert = AlertTarget(.loading.title("正在加载").message("这个弹窗被放在指定容器中"))
                 alert.add(action: "返回上一页") { alert in
                     vc.dismiss(animated: true)
                 }
diff --git a/PHDemo/PHDemo/DemoCapsuleVC.swift b/PHDemo/PHDemo/DemoCapsuleVC.swift
index c98fbdf..e8c8127 100644
--- a/PHDemo/PHDemo/DemoCapsuleVC.swift
+++ b/PHDemo/PHDemo/DemoCapsuleVC.swift
@@ -35,9 +35,8 @@ class DemoCapsuleVC: ListVC {
                 }
             }
             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。")
+                // 也可以手动创建一个Target实例，在需要的时候再push
+                let obj = CapsuleTarget(.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
                 DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
                     obj.push()
@@ -55,7 +54,7 @@ class DemoCapsuleVC: ListVC {
         
         list.add(title: "默认布局：图文") { section in
             section.add(title: "下载进度") {
-                let capsule = Capsule().target
+                let capsule = CapsuleTarget()
                 capsule.vm = .message("正在下载").icon(.init(systemName: "arrow.down.circle.fill")).duration(.infinity)
                 capsule.update(progress: 0)
                 capsule.push()
diff --git a/PHDemo/PHDemo/DemoToastVC.swift b/PHDemo/PHDemo/DemoToastVC.swift
index 72bf556..e84f7e9 100644
--- a/PHDemo/PHDemo/DemoToastVC.swift
+++ b/PHDemo/PHDemo/DemoToastVC.swift
@@ -79,7 +79,7 @@ class DemoToastVC: ListVC {
             section.add(title: "图标 + 标题 + 正文") {
                 let s1 = "笑容正在加载"
                 let s2 = "这通常不会太久"
-                let toast = Toast(.loading.title(s1).message(s2)).target
+                let toast = ToastTarget(.loading.title(s1).message(s2))
                 toast.push()
                 toast.update(progress: 0)
                 updateProgress(in: 4) { percent in
@@ -186,9 +186,7 @@ class DemoToastVC: ListVC {
             }
             section.add(title: "不存在就创建，存在就更新") {
                 i += 1
-                Toast.lazyPush(identifier: "loading") { toast in
-                    toast.vm = .loading.title("正在加载\(i)").message("这条消息不会重复显示多条")
-                }
+                Toast(.identifier("loading").title("正在加载\(i)").message("这条消息不会重复显示多条"))
             }
             section.add(title: "如果存在就更新，如果不存在就忽略") {
                 i += 1
diff --git a/Sources/ProHUD/Alert/AlertProvider.swift b/Sources/ProHUD/Alert/AlertProvider.swift
index f480f70..7837890 100644
--- a/Sources/ProHUD/Alert/AlertProvider.swift
+++ b/Sources/ProHUD/Alert/AlertProvider.swift
@@ -21,9 +21,17 @@ open class AlertProvider: HUDProvider<AlertViewModel, AlertTarget> {
     ///   - vm: 数据模型
     ///   - initializer: 自定义的初始化代码
     @discardableResult public convenience init(_ vm: ViewModel, initializer: ((_ alert: Target) -> Void)?) {
-        self.init { alert in
-            alert.vm = vm
-            initializer?(alert)
+        if let id = vm.identifier, id.count > 0 {
+            Self.lazyPush(identifier: id) { target in
+                target.vm = vm
+                initializer?(target)
+            }
+            self.init(initializer: nil)
+        } else {
+            self.init { target in
+                target.vm = vm
+                initializer?(target)
+            }
         }
     }
     /// 根据ViewModel创建一个Target并显示
diff --git a/Sources/ProHUD/Alert/AlertTarget.swift b/Sources/ProHUD/Alert/AlertTarget.swift
index 57709ba..3149e53 100644
--- a/Sources/ProHUD/Alert/AlertTarget.swift
+++ b/Sources/ProHUD/Alert/AlertTarget.swift
@@ -9,6 +9,8 @@ import UIKit
 
 open class AlertTarget: BaseController, HUDTargetType {
     
+    public typealias ViewModel = AlertViewModel
+    
     public lazy var config: AlertConfiguration = {
         var cfg = AlertConfiguration()
         AlertConfiguration.customGlobalConfig?(cfg)
@@ -74,7 +76,11 @@ open class AlertTarget: BaseController, HUDTargetType {
     }()
     
     /// 视图模型
-    @objc public var vm: AlertViewModel?
+    @objc public var vm: AlertViewModel? {
+        didSet {
+            vm?.vc = self
+        }
+    }
     
     public override var title: String? {
         didSet {
@@ -94,6 +100,11 @@ open class AlertTarget: BaseController, HUDTargetType {
         fatalError("init(coder:) has not been implemented")
     }
     
+    public convenience init(_ vm: ViewModel) {
+        self.init()
+        self.vm = vm
+    }
+    
     public override func viewDidLoad() {
         super.viewDidLoad()
         reloadData(animated: false)
diff --git a/Sources/ProHUD/Capsule/CapsuleProvider.swift b/Sources/ProHUD/Capsule/CapsuleProvider.swift
index 00b8d5a..161fc4a 100644
--- a/Sources/ProHUD/Capsule/CapsuleProvider.swift
+++ b/Sources/ProHUD/Capsule/CapsuleProvider.swift
@@ -21,9 +21,17 @@ open class CapsuleProvider: HUDProvider<CapsuleViewModel, CapsuleTarget> {
     ///   - vm: 数据模型
     ///   - initializer: 初始化代码
     @discardableResult public convenience init(_ vm: ViewModel, initializer: ((_ capsule: Target) -> Void)?) {
-        self.init { capsule in
-            capsule.vm = vm
-            initializer?(capsule)
+        if let id = vm.identifier, id.count > 0 {
+            Self.lazyPush(identifier: id) { target in
+                target.vm = vm
+                initializer?(target)
+            }
+            self.init(initializer: nil)
+        } else {
+            self.init { target in
+                target.vm = vm
+                initializer?(target)
+            }
         }
     }
     
diff --git a/Sources/ProHUD/Capsule/CapsuleTarget.swift b/Sources/ProHUD/Capsule/CapsuleTarget.swift
index dc56c33..85c8fc1 100644
--- a/Sources/ProHUD/Capsule/CapsuleTarget.swift
+++ b/Sources/ProHUD/Capsule/CapsuleTarget.swift
@@ -9,7 +9,9 @@ import UIKit
 
 open class CapsuleTarget: BaseController, HUDTargetType {
     
-    public lazy var config: CapsuleConfiguration = {
+    public typealias ViewModel = CapsuleViewModel
+    
+    @objc public lazy var config: CapsuleConfiguration = {
         var cfg = CapsuleConfiguration()
         CapsuleConfiguration.customGlobalConfig?(cfg)
         return cfg
@@ -46,7 +48,11 @@ open class CapsuleTarget: BaseController, HUDTargetType {
         return lb
     }()
     
-    public var vm: CapsuleViewModel?
+    @objc public var vm: CapsuleViewModel? {
+        didSet {
+            vm?.vc = self
+        }
+    }
     
     public override var title: String? {
         didSet {
@@ -68,6 +74,11 @@ open class CapsuleTarget: BaseController, HUDTargetType {
         fatalError("init(coder:) has not been implemented")
     }
     
+    public convenience init(_ vm: ViewModel) {
+        self.init()
+        self.vm = vm
+    }
+    
     public override func viewDidLoad() {
         super.viewDidLoad()
         view.layer.shadowRadius = 8
@@ -84,7 +95,7 @@ open class CapsuleTarget: BaseController, HUDTargetType {
         
     }
     
-    public func onTapped(action: @escaping (_ capsule: CapsuleTarget) -> Void) {
+    @objc public func onTapped(action: @escaping (_ capsule: CapsuleTarget) -> Void) {
         self.tapActionCallback = action
     }
     
diff --git a/Sources/ProHUD/Core/Models/BaseViewModel.swift b/Sources/ProHUD/Core/Models/BaseViewModel.swift
index 689e825..ab32a33 100644
--- a/Sources/ProHUD/Core/Models/BaseViewModel.swift
+++ b/Sources/ProHUD/Core/Models/BaseViewModel.swift
@@ -12,6 +12,26 @@ public protocol HUDViewModelType {}
 /// 数据模型
 open class BaseViewModel: NSObject, HUDViewModelType {
     
+    /// 在创建target之前临时暂存的id
+    private var tmpStoredIdentifier: String?
+    
+    /// 创建target时将指定为此值
+    @objc open var identifier: String? {
+        set {
+            tmpStoredIdentifier = newValue
+            if let id = tmpStoredIdentifier, id.count > 0 {
+                vc?.identifier = id
+            }
+        }
+        get {
+            if let vc = vc {
+                return vc.identifier
+            } else {
+                return tmpStoredIdentifier
+            }
+        }
+    }
+    
     /// 图标
     @objc open var icon: UIImage?
     @objc var iconURL: URL?
@@ -34,7 +54,15 @@ open class BaseViewModel: NSObject, HUDViewModelType {
         }
     }
     
-    @objc public required override init() {
+    weak var vc: BaseController? {
+        didSet {
+            if let id = tmpStoredIdentifier {
+                vc?.identifier = id
+            }
+        }
+    }
+    
+    @objc required public override init() {
         
     }
     
@@ -70,6 +98,11 @@ open class BaseViewModel: NSObject, HUDViewModelType {
 // MARK: - convenience func
 public extension BaseViewModel {
     
+    func identifier(_ identifier: String?) -> Self {
+        self.identifier = identifier
+        return self
+    }
+    
     func icon(_ image: UIImage?) -> Self {
         self.icon = image
         return self
@@ -110,6 +143,11 @@ public extension BaseViewModel {
 // MARK: - example scenes
 public extension BaseViewModel {
     
+    static func identifier(_ text: String?) -> Self {
+        .init()
+        .identifier(text)
+    }
+    
     // MARK: plain
     static func title(_ text: String?) -> Self {
         .init()
diff --git a/Sources/ProHUD/Core/Protocols/Provider.swift b/Sources/ProHUD/Core/Protocols/Provider.swift
index b25c7cb..134eb65 100644
--- a/Sources/ProHUD/Core/Protocols/Provider.swift
+++ b/Sources/ProHUD/Core/Protocols/Provider.swift
@@ -18,28 +18,23 @@ public protocol HUDProviderType {
     
 }
 
-open class HUDProvider<ViewModel: HUDViewModelType, Target: HUDTargetType>: HUDProviderType {
-    
-    /// HUD实例
-    public var target: Target
+open class HUDProvider<ViewModel: HUDViewModelType, Target: HUDTargetType>: NSObject, HUDProviderType {
     
     /// 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
+    /// - Parameter initializer: 初始化代码（传空值时不会做任何事）
     @discardableResult public required init(initializer: ((_ target: Target) -> Void)?) {
+        guard let initializer = initializer else {
+            // Provider的作用就是push一个target
+            // 如果没有任何初始化代码就没有target，就是个无意义的Provider
+            // 但为了支持lazyPush（找到已有实例并更新），所以就需要支持无意义的Provider
+            // 详见子类中的 self.init(initializer: nil)
+            return
+        }
         var t = Target()
-        initializer?(t)
-        self.target = t
-        if (t.vm == nil && initializer == nil) == false {
-            DispatchQueue.main.async {
-                t.push()
-            }
+        initializer(t)
+        DispatchQueue.main.async {
+            t.push()
         }
     }
     
-    /// 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(initializer: nil)
-    }
-    
-    
 }
diff --git a/Sources/ProHUD/Core/Views/ProgressView.swift b/Sources/ProHUD/Core/Views/ProgressView.swift
index e2d555d..d1f5238 100644
--- a/Sources/ProHUD/Core/Views/ProgressView.swift
+++ b/Sources/ProHUD/Core/Views/ProgressView.swift
@@ -34,7 +34,7 @@ public class ProgressView: UIView {
         let bgLayer = CAShapeLayer()
         bgLayer.fillColor = UIColor.clear.cgColor
         bgLayer.path = path.cgPath
-        bgLayer.strokeColor = UIColor.white.cgColor
+        bgLayer.strokeColor = UIColor.clear.cgColor
         bgLayer.lineWidth = lineWidth
         bgLayer.lineCap = .round
         bgLayer.strokeStart = 0
diff --git a/Sources/ProHUD/Sheet/SheetTarget.swift b/Sources/ProHUD/Sheet/SheetTarget.swift
index 5fc245f..b83287a 100644
--- a/Sources/ProHUD/Sheet/SheetTarget.swift
+++ b/Sources/ProHUD/Sheet/SheetTarget.swift
@@ -41,7 +41,11 @@ open class SheetTarget: BaseController, HUDTargetType {
         }
     }
     
-    public var vm: SheetViewModel? = nil
+    public var vm: SheetViewModel? = nil {
+        didSet {
+            vm?.vc = self
+        }
+    }
     
     required public override init() {
         super.init()
diff --git a/Sources/ProHUD/Toast/ToastDefaultLayout.swift b/Sources/ProHUD/Toast/ToastDefaultLayout.swift
index 4e6decb..fcc3d40 100644
--- a/Sources/ProHUD/Toast/ToastDefaultLayout.swift
+++ b/Sources/ProHUD/Toast/ToastDefaultLayout.swift
@@ -26,11 +26,17 @@ extension ToastTarget: DefaultLayout {
             }
             return
         }
+        let titleCount = vm?.title?.count ?? 0
+        let bodyCount = vm?.message?.count ?? 0
         if vm?.icon != nil || vm?.iconURL != nil {
             if imageView.superview == nil {
                 infoStack.insertArrangedSubview(imageView, at: 0)
                 imageView.snp.makeConstraints { make in
-                    make.width.height.equalTo(config.iconSize)
+                    if titleCount > 0 && bodyCount > 0 {
+                        make.width.height.equalTo(config.iconSize)
+                    } else {
+                        make.width.equalTo(config.iconSize)
+                    }
                 }
             }
         } else {
@@ -42,8 +48,6 @@ extension ToastTarget: DefaultLayout {
         if textStack.superview == nil {
             infoStack.addArrangedSubview(textStack)
         }
-        let titleCount = vm?.title?.count ?? 0
-        let bodyCount = vm?.message?.count ?? 0
         if titleCount > 0 {
             textStack.insertArrangedSubview(titleLabel, at: 0)
             if bodyCount > 0 {
diff --git a/Sources/ProHUD/Toast/ToastProvider.swift b/Sources/ProHUD/Toast/ToastProvider.swift
index a94f6fe..b65ce18 100644
--- a/Sources/ProHUD/Toast/ToastProvider.swift
+++ b/Sources/ProHUD/Toast/ToastProvider.swift
@@ -21,9 +21,17 @@ open class ToastProvider: HUDProvider<ToastViewModel, ToastTarget> {
     ///   - vm: 数据模型
     ///   - initializer: 自定义的初始化代码
     @discardableResult public convenience init(_ vm: ViewModel, initializer: ((_ toast: Target) -> Void)?) {
-        self.init { toast in
-            toast.vm = vm
-            initializer?(toast)
+        if let id = vm.identifier, id.count > 0 {
+            Self.lazyPush(identifier: id) { target in
+                target.vm = vm
+                initializer?(target)
+            }
+            self.init(initializer: nil)
+        } else {
+            self.init { target in
+                target.vm = vm
+                initializer?(target)
+            }
         }
     }
     
diff --git a/Sources/ProHUD/Toast/ToastTarget.swift b/Sources/ProHUD/Toast/ToastTarget.swift
index 9b875d9..2a230a3 100644
--- a/Sources/ProHUD/Toast/ToastTarget.swift
+++ b/Sources/ProHUD/Toast/ToastTarget.swift
@@ -9,6 +9,8 @@ import UIKit
 
 open class ToastTarget: BaseController, HUDTargetType {
     
+    public typealias ViewModel = ToastViewModel
+    
     weak var window: ToastWindow?
     
     public lazy var config: ToastConfiguration = {
@@ -84,7 +86,11 @@ open class ToastTarget: BaseController, HUDTargetType {
     public var isRemovable = true
     
     /// 视图模型
-    @objc public var vm: ToastViewModel?
+    @objc public var vm: ToastViewModel? {
+        didSet {
+            vm?.vc = self
+        }
+    }
     
     private var tapActionCallback: ((_ toast: ToastTarget) -> Void)?
     
@@ -103,7 +109,12 @@ open class ToastTarget: BaseController, HUDTargetType {
     }
     
     required public init?(coder: NSCoder) {
-        fatalError("init(coder:) has not been implemented")
+        super.init(coder: coder)
+    }
+    
+    public convenience init(_ vm: ViewModel) {
+        self.init()
+        self.vm = vm
     }
     
     public override func viewDidLoad() {