diff --git a/ProHUD/Guard/GuardController.swift b/ProHUD/Guard/GuardController.swift
index 485fc96..60cc46c 100644
--- a/ProHUD/Guard/GuardController.swift
+++ b/ProHUD/Guard/GuardController.swift
@@ -120,6 +120,7 @@ public extension Guard {
     func pop() {
         if displaying {
             debug("pop")
+            willDisappearCallback?()
             displaying = false
             view.isUserInteractionEnabled = false
             self.removeFromParent()
@@ -207,6 +208,12 @@ public extension Guard {
         return self
     }
     
+    /// 消失事件
+    /// - Parameter callback: 事件回调
+    @discardableResult func willDisappear(_ callback: (() -> Void)?) -> Guard {
+        willDisappearCallback = callback
+        return self
+    }
     /// 消失事件
     /// - Parameter callback: 事件回调
     @discardableResult func didDisappear(_ callback: (() -> Void)?) -> Guard {
diff --git a/ProHUD/HUDController.swift b/ProHUD/HUDController.swift
index bf6e53f..b2a9808 100644
--- a/ProHUD/HUDController.swift
+++ b/ProHUD/HUDController.swift
@@ -13,6 +13,7 @@ public class HUDController: UIViewController {
     /// ID标识
     public var identifier = String(Date().timeIntervalSince1970)
     
+    internal var willDisappearCallback: (() -> Void)?
     /// 消失回调
     internal var disappearCallback: (() -> Void)?
     
@@ -39,6 +40,7 @@ public class HUDController: UIViewController {
         // Do any additional setup after loading the view.
     }
     
+    
     public override func viewDidDisappear(_ animated: Bool) {
         super.viewDidDisappear(animated)
         disappearCallback?()