UIImagePickerController多次替换图片后崩溃报错求助

问题现象 #

使用UIImagePickerController的编辑功能时，替换图片5-6次后程序崩溃，抛出以下错误：

<0x100d08660> Gesture: System gesture gate timed out.

[u 0A3027E7-E344-4002-9629:m (null)] [com.apple.mobileslideshow.photo-picker(1.0)] Connection to plugin interrupted while in use.

[u 0A3027E7-E344-4002-9629:m (null)] [com.apple.mobileslideshow.photo-picker(1.0)] Connection to plugin invalidated while in use.

-[PUPhotoPickerHostViewController viewServiceDidTerminateWithError:] Error Error Domain=_UIViewServiceInterfaceErrorDomain Code=3 "(null)" UserInfo={Message=Service Connection Interrupted}

相关代码如下：

import SwiftUI

struct ImagePicker: UIViewControllerRepresentable {
    var sourceType: UIImagePickerController.SourceType = .photoLibrary
    
    @Binding var selectedImage: UIImage
    @Binding var showSheet: Bool
    
    func makeUIViewController(context: UIViewControllerRepresentableContext<ImagePicker>) -> UIImagePickerController {
        
        let imagePicker = UIImagePickerController()
        imagePicker.allowsEditing = true
        imagePicker.sourceType = sourceType
        imagePicker.delegate = context.coordinator
        
        let appearance = UINavigationBarAppearance()
        appearance.configureWithTransparentBackground()
        appearance.backgroundColor = .systemBackground
        appearance.titleTextAttributes = [.foregroundColor: UIColor.systemBackground]
        appearance.largeTitleTextAttributes = [.foregroundColor: UIColor.systemBackground]
        
        imagePicker.navigationBar.tintColor = .white
        imagePicker.navigationBar.standardAppearance = appearance
        imagePicker.navigationBar.compactAppearance = appearance
        imagePicker.navigationBar.scrollEdgeAppearance = appearance
        
        return imagePicker
    }
    
    func updateUIViewController(_ uiViewController: UIImagePickerController, context: UIViewControllerRepresentableContext<ImagePicker>) {
        
    }
    
    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }
    
    final class Coordinator: NSObject, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
        
        var parent: ImagePicker
        
        init(_ parent: ImagePicker) {
            self.parent = parent
        }
        
        func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
            
            if let image = info[UIImagePickerController.InfoKey.editedImage] as? UIImage {
                parent.selectedImage = image
            }
            
            parent.showSheet = false
        }
        
    }
}

struct ImagePickerTest: View {
    @State private var image = UIImage()
    @State private var showSheet = false
    
    var body: some View {
        VStack {

            Button("Change photo") {
                showSheet = true
            }
            Image(uiImage: self.image)
                .resizable()
                .frame(width: 100, height: 100)
                .background(Color.gray)
                .scaledToFit()
                .clipShape(Circle())
        }
        .sheet(isPresented: $showSheet) {
            ImagePicker(sourceType: .photoLibrary, selectedImage: $image, showSheet: $showSheet)
                .ignoresSafeArea(.all)
        }
    }
}

问题原因 #

1. 未正确销毁Picker实例：原代码仅通过修改showSheet绑定关闭Sheet，但未主动调用UIImagePickerController的dismiss方法，导致Picker实例无法被正确销毁，插件进程资源持续占用，多次重复后触发连接中断。
2. 循环引用风险：Coordinator强持有parent（ImagePicker实例），可能引发循环引用，导致内存泄漏，进一步加剧资源消耗。
3. 缺少取消处理逻辑：未实现imagePickerControllerDidCancel代理方法，用户取消选择时Picker同样无法被正确清理。

修复方案 #

1. 修改Coordinator的引用方式并完善代理方法 #

将Coordinator中对parent的引用改为弱引用，并实现取消选择的处理逻辑，确保Picker被正确dismiss：

final class Coordinator: NSObject, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    // 改为弱引用避免循环引用
    weak var parent: ImagePicker?

    init(_ parent: ImagePicker) {
        self.parent = parent
    }

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        if let image = info[.editedImage] as? UIImage {
            parent?.selectedImage = image
        }
        // 先dismiss Picker，再更新绑定状态
        picker.dismiss(animated: true) {
            self.parent?.showSheet = false
        }
    }

    // 实现取消选择的代理方法
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        picker.dismiss(animated: true) {
            self.parent?.showSheet = false
        }
    }
}

2. 确保Sheet的正确销毁 #

SwiftUI的sheet在isPresented变为false时会自动销毁内部的ViewController，但配合主动调用Picker的dismiss，可以确保资源被及时释放，避免插件进程过载。

额外说明 #

PhotosPicker基于新的PhotosUI框架，采用了更轻量的进程管理机制，因此不会出现此类问题，但它确实缺乏UIImagePickerController的内置编辑功能。上述修改通过规范内存管理和Picker生命周期，即可解决重复编辑后的崩溃问题。

内容的提问来源于stack exchange，提问作者MobileFirst