使用UIImagePickerController

如何解决使用UIImagePickerController

我有一个SwiftUI应用，该应用正在使用包裹在UIViewControllerRepresentable中的图像选择器，并使用.sheet修饰符来显示它。

在拾取图像后，应用程序的其余部分或多或少地停止运行，直到后台出现某种崩溃，并且一切再次变快-在代码之后需要更多信息：

import SwiftUI

struct StylePanel: View {
    
    @Binding var image: Image?

    @State var inputimage: UIImage? = nil
    @State var showImagePicker: Bool

    func loadImage() {
        guard let inputimage = inputimage else { return }
        image = Image(uiImage: inputimage)
    }
    
    var body: some View {
        
        vstack {
            // Rest of view not shown


            Button(action: {
                self.showImagePicker = true
            },label: {
                Text("Choose image...")
            })
        }
        .sheet(isPresented: self.$showImagePicker,ondismiss: loadImage){
            ImagePicker(image: self.$inputimage)
        }
    }
}

ImagePicker.swift：

import SwiftUI

struct ImagePicker: UIViewControllerRepresentable {
    @Environment(\.presentationMode) var presentationMode
    @Binding var image: UIImage?

    func makeUIViewController(context: UIViewControllerRepresentableContext<ImagePicker>) -> UIImagePickerController {
        let picker = UIImagePickerController()
        picker.delegate = context.coordinator
        return picker
    }

    func updateUIViewController(_ uiViewController: UIImagePickerController,context: UIViewControllerRepresentableContext<ImagePicker>) {

    }
        
    func makeCoordinator() -> ImagePickerCoordinator {
        return ImagePickerCoordinator(self)
    }
}


class ImagePickerCoordinator: NSObject,UINavigationControllerDelegate,UIImagePickerControllerDelegate {
    let parent: ImagePicker

    init(_ parent: ImagePicker) {
        self.parent = parent
    }
    
    func imagePickerController(_ picker: UIImagePickerController,didFinishPickingMediawithInfo info: [UIImagePickerController.InfoKey: Any]) {
        if let uiImage = info[.originalImage] as? UIImage {
            parent.image = uiImage
        }

        parent.presentationMode.wrappedValue.dismiss()
    }
}

一旦选择了图像，它在父级中就可以很好地显示，但是其他操作（例如拖动或修改状态）确实很麻烦。该应用程序非常无响应，直到最终发生奇怪的事情为止–后台发生viewServiceDidTerminateWithError种崩溃，一切恢复正常，性能恢复正常。继而重新加载图像选择器会使情况变得更糟，直到发生相同的事情-背景崩溃和正常性能。

这是错误，之后性能恢复正常：

[ServicesDaemonManager] interruptionHandler is called. -[FontServicesDaemonManager connection]_block_invoke
[xpc] xpc error talking to pkd: Connection interrupted
[lifecycle] [u 123223B6-8A6C-4BC3-9908-269FA8A8B9E6:m (null)] [com.apple.mobileslideshow.photo-picker(1.0)] Connection to plugin interrupted while in use.
[lifecycle] [u 123223B6-8A6C-4BC3-9908-269FA8A8B9E6:m (null)] [com.apple.mobileslideshow.photo-picker(1.0)] Connection to plugin invalidated while in use.
viewServiceDidTerminateWithError:: Error Domain=_UIViewServiceInterfaceErrorDomain Code=3 "(null)" UserInfo={Message=Service Connection Interrupted}
[Generic] -[PUPhotoPickerHostViewController viewServiceDidTerminateWithError:] Error Error Domain=_UIViewServiceInterfaceErrorDomain Code=3 "(null)" UserInfo={Message=Service Connection Interrupted}

它似乎与.sheet的使用直接相关。当我将选择器直接放在包含视图中时，它可以正常工作而没有任何问题。

我想知道的是如何正确处置UIImagePickerController模式以停止此性能问题。

其他人有没有经历过或知道解决方案？

解决方法

您是否尝试过使用@StateObject var inputImage而不是@State？这样将对图像进行一次初始化，从而避免在视图更改时不断重新加载图像。