如何在 SwiftUI 中打开 ImagePicker? [英] How to open the ImagePicker in SwiftUI?

问题描述

我需要使用 SwiftUI 在我的应用程序中打开图像选择器，我该怎么做?

I need to open an image picker in my app using SwiftUI, how can I do that?

我想过使用 UIImagePickerController，但我不知道如何在 SwiftUI 中做到这一点.

I thought about using the UIImagePickerController, but I don't know how to do that in SwiftUI.

推荐答案

Xcode 12 的清理版本可通过 SPM 作为 Swift 包获得:

Cleaned up version for Xcode 12 available via SPM as Swift Package:

https://github.com/ralfebert/ImagePickerView

来源:

import SwiftUI

public struct ImagePickerView: UIViewControllerRepresentable {

    private let sourceType: UIImagePickerController.SourceType
    private let onImagePicked: (UIImage) -> Void
    @Environment(.presentationMode) private var presentationMode

    public init(sourceType: UIImagePickerController.SourceType, onImagePicked: @escaping (UIImage) -> Void) {
        self.sourceType = sourceType
        self.onImagePicked = onImagePicked
    }

    public func makeUIViewController(context: Context) -> UIImagePickerController {
        let picker = UIImagePickerController()
        picker.sourceType = self.sourceType
        picker.delegate = context.coordinator
        return picker
    }

    public func updateUIViewController(_ uiViewController: UIImagePickerController, context: Context) {}

    public func makeCoordinator() -> Coordinator {
        Coordinator(
            onDismiss: { self.presentationMode.wrappedValue.dismiss() },
            onImagePicked: self.onImagePicked
        )
    }

    final public class Coordinator: NSObject, UINavigationControllerDelegate, UIImagePickerControllerDelegate {

        private let onDismiss: () -> Void
        private let onImagePicked: (UIImage) -> Void

        init(onDismiss: @escaping () -> Void, onImagePicked: @escaping (UIImage) -> Void) {
            self.onDismiss = onDismiss
            self.onImagePicked = onImagePicked
        }

        public func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey: Any]) {
            if let image = info[.originalImage] as? UIImage {
                self.onImagePicked(image)
            }
            self.onDismiss()
        }

        public func imagePickerControllerDidCancel(_: UIImagePickerController) {
            self.onDismiss()
        }

    }

}

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