swift - SwiftUI 中的 ImagePicker

Question

我正在尝试在 SwiftUI 中创建一个图像选择器，如下 this tutorial .基本上，这个想法是当用户点击屏幕上的灰色矩形时，会出现一个图像选择器。当他们选择一个图像时，它被导入到灰色矩形中。
问题是，当我运行代码时，出现以下错误:Thread 1: Fatal error: Reading Environment<Binding<PresentationMode>> outside View.body这出现在线parent.presentationMode.wrappedValue.dismiss()在图像选择器结构中。
我的代码如下所示:
图像选择器

struct ImagePicker: UIViewControllerRepresentable {
    
  @Environment(\.presentationMode) var presentationMode
  @Binding var image: UIImage?
    
    class Coordinator: 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()
        }     
    }
    
    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }
    

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

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

内容 View

import SwiftUI

struct ContentView: View {
    
    @State private var image: Image?
    @State private var showingImagePicker = false
    @State private var inputImage: UIImage?
    

    var body: some View {
     NavigationView {
             ZStack {
                 Rectangle()
                     .fill(Color.secondary)

                 if image != nil {
                     image?
                         .resizable()
                         .scaledToFit()
                 } else {
                     Text("Tap to select a picture")
                 }
             }
             .onTapGesture {
                 self.showingImagePicker = true
             }


        .sheet(isPresented: $showingImagePicker, onDismiss: loadImage) {
            ImagePicker(image: self.$inputImage)
        }
     }
    }

    func loadImage() {
        guard let inputImage = inputImage else { return }
        image = Image(uiImage: inputImage)
    }
    
}

类似于推荐的解决方案 here ，我尝试更换 @Environment(\.presentationMode) var presentationMode与 @Binding var isPresented: Bool在图像选择器结构中并替换麻烦的行 parent.presentationMode.wrappedValue.dismiss()与 parent.isPresented = false .
然而，这导致了一个不同的问题——当工作表被解散时图像没有加载(我猜是因为我没有在任何地方调用 dismiss() 方法)。
我对 Swift 和编码很陌生，所以如果我能在任何地方更简洁地解释并随时进行更正，我深表歉意。

Answer 1

好的，看起来您正在测试 13.1 -> 更新到 13.2 - 它可以工作