解决搜索页面的交互问题

dimensionhub/Views/Search/SearchView.swift

@@ -28,6 +28,18 @@ struct SearchView: View {
         VStack(spacing: 0) {
             Color.clear
                 .frame(height: 8)
+                .background(
+                    GestureObserver {
+                        // 当检测到系统返回手势时调用
+                        if isFocused {
+                            isFocused = false
+                        }
+                    } onGestureCancelled: {
+                        if !isFocused && !showSearchResult {
+                            isFocused = true
+                        }
+                    }
+                )
             
             VStack {
                 ScrollView(.vertical, showsIndicators: false) {
@@ -54,15 +66,6 @@ struct SearchView: View {
                     .opacity(showSearchResult && searchModel.dramaGroups.isEmpty ? 1 : 0)
             }
         }
-        .background(
-            GestureObserver {
-                // 当检测到系统返回手势时调用
-                if isFocused {
-                    isFocused = false
-                }
-            }
-            .frame(width: 0, height: 0)
-        )
         .navigationTitle("")
         .toolbar {
             ToolbarItem(placement: .principal) {
@@ -134,37 +137,78 @@ struct SearchDramaGroupView: View {
 
 struct GestureObserver: UIViewControllerRepresentable {
     var onGestureBegin: () -> Void
+    var onGestureCancelled: () -> Void
 
     func makeUIViewController(context: Context) -> UIViewController {
-        let controller = UIViewController()
-        DispatchQueue.main.async {
-            if let nav = controller.navigationController,
-               let gesture = nav.interactivePopGestureRecognizer {
-                gesture.addTarget(context.coordinator, action: #selector(Coordinator.handleGesture(_:)))
-            }
-        }
-        return controller
+        return context.coordinator
     }
 
     func updateUIViewController(_ uiViewController: UIViewController, context: Context) { }
 
     func makeCoordinator() -> Coordinator {
-        Coordinator(onGestureBegin: onGestureBegin)
+        Coordinator(onGestureBegin: onGestureBegin, onGestureCancelled: onGestureCancelled)
     }
 
-    class Coordinator: NSObject {
+    class Coordinator: UIViewController {
         var onGestureBegin: () -> Void
+        var onGestureCancelled: () -> Void
+        
+        // 用来保存当前堆栈中的数量
+        var initialStackCount: Int = 0
+        
+        // 保存起来
+        var cacheNavigationController: UINavigationController?
 
-        init(onGestureBegin: @escaping () -> Void) {
+        init(onGestureBegin: @escaping () -> Void, onGestureCancelled: @escaping () -> Void) {
             self.onGestureBegin = onGestureBegin
+            self.onGestureCancelled = onGestureCancelled
+            super.init(nibName: nil, bundle: nil)
         }
-
+        
+        required init?(coder: NSCoder) {
+            fatalError("init(coder:) has not been implemented")
+        }
+        
+        override func viewDidAppear(_ animated: Bool) {
+            super.viewDidAppear(animated)
+            guard let nav = self.navigationController else {
+                return
+            }
+            initialStackCount = nav.viewControllers.count
+            
+            self.cacheNavigationController = nav
+            // 添加手势识别函数
+            if let gesture = nav.interactivePopGestureRecognizer {
+                gesture.addTarget(self, action: #selector(handleGesture(_:)))
+            }
+        }
+        
         @objc func handleGesture(_ gesture: UIScreenEdgePanGestureRecognizer) {
-            if gesture.state == .began {
+            switch gesture.state {
+            case .began:
                 onGestureBegin()
+            case .ended:
+                if let nav = self.cacheNavigationController {
+                    DispatchQueue.main.asyncAfter(deadline: .now() + 0.8) { [self] in
+                        let afterCount = nav.viewControllers.count
+                        if afterCount < initialStackCount {
+                            // 页面真的 pop 出去了
+                            print("pop out")
+                        } else {
+                            // 页面还在
+                            onGestureCancelled()
+                        }
+                    }
+                }
+            case .cancelled, .failed:
+                onGestureCancelled()
+                
+            default:
+                break
             }
         }
     }
+    
 }