我需要使用SwiftUI在应用程序中打开ImagePicker，我该怎么做？
我考虑过使用UIImagePickerController，但是我不知道如何在SwiftUI中做到这一点。
最佳答案
这是一个“粗糙的边缘”实现。
您需要将UIImagePickerController包装在实现UIViewControllerRepresentable的结构中。
有关UIViewControllerRepresentable的更多信息，请查看此惊人的WWDC 2019演讲：
Integrating SwiftUI
struct ImagePicker: UIViewControllerRepresentable {
@Environment(\.presentationMode)
var presentationMode
@Binding var image: Image?
class Coordinator: NSObject, UINavigationControllerDelegate, UIImagePickerControllerDelegate {
@Binding var presentationMode: PresentationMode
@Binding var image: Image?
init(presentationMode: Binding<PresentationMode>, image: Binding<Image?>) {
_presentationMode = presentationMode
_image = image
}
func imagePickerController(_ picker: UIImagePickerController,
didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
let uiImage = info[UIImagePickerController.InfoKey.originalImage] as! UIImage
image = Image(uiImage: uiImage)
presentationMode.dismiss()
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
presentationMode.dismiss()
}
}
func makeCoordinator() -> Coordinator {
return Coordinator(presentationMode: presentationMode, image: $image)
}
func makeUIViewController(context: UIViewControllerRepresentableContext<ImagePicker>) -> UIImagePickerController {
let picker = UIImagePickerController()
picker.delegate = context.coordinator
return picker
}
func updateUIViewController(_ uiViewController: UIImagePickerController,
context: UIViewControllerRepresentableContext<ImagePicker>) {
}
}
这是一个简单的测试视图。
从某种意义上来说，这很粗糙：
选择器显示在工作表中
所选图像将不显示任何形式的动画，并替换
Show image picker按钮struct ContentView: View {
@State var showImagePicker: Bool = false
@State var image: Image? = nil
var body: some View {
ZStack {
VStack {
Button(action: {
withAnimation {
self.showImagePicker.toggle()
}
}) {
Text("Show image picker")
}
image?.resizable().frame(width: 100, height: 100)
}
.sheet(isPresented: $showImagePicker) {
ImagePicker(image: self.$image)
}
}
}
}
我希望这可以作为起点！
我敢肯定，一旦
SwiftUI超出测试版，Apple就会使此操作变得更容易。
在Xcode 11.1上测试
关于ios - 如何在SwiftUI中打开ImagePicker？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/56855649/