SwiftUI中使用ImagePicker报错：Cannot find 'ImagePicker' in scope，需导入什么？

SwiftUI框架本身并没有提供现成的ImagePicker结构体和pickImage()方法，你看到的文章里的实现是自定义的，并非系统原生API，所以直接套用会报错。下面是完整的解决方案：

1. 导入必要框架 #

在代码文件顶部添加：

import SwiftUI
import UIKit

2. 自定义实现ImagePicker #

通过UIViewControllerRepresentable桥接UIKit的UIImagePickerController，实现SwiftUI可用的图片选择器：

struct ImagePicker: UIViewControllerRepresentable {
    @Binding var selectedImage: UIImage?
    @Environment(\.dismiss) private var dismiss
    
    func makeUIViewController(context: Context) -> UIImagePickerController {
        let picker = UIImagePickerController()
        picker.delegate = context.coordinator
        picker.sourceType = .photoLibrary // 改成.camera可调用相机
        return picker
    }
    
    func updateUIViewController(_ uiViewController: UIImagePickerController, context: Context) {}
    
    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }
    
    class Coordinator: NSObject, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
        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.selectedImage = uiImage
            }
            parent.dismiss()
        }
        
        func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
            parent.dismiss()
        }
    }
}

3. 修改ContentView代码 #

图片选择是异步操作，需要通过绑定变量+模态弹窗的方式实现：

struct ContentView: View {
    @State private var image: UIImage?
    @State private var showImagePicker = false
    
    var body: some View {
        VStack {
            if let image = image {
                Image(uiImage: image)
                    .resizable()
                    .scaledToFit()
                    .frame(maxWidth: 300, maxHeight: 300)
            } else {
                Text("未选择图片")
                    .font(.title)
                    .foregroundColor(.gray)
            }
            
            Button("选择图片") {
                showImagePicker = true
            }
            .padding()
            .background(Color.blue)
            .foregroundColor(.white)
            .cornerRadius(8)
        }
        .sheet(isPresented: $showImagePicker) {
            ImagePicker(selectedImage: $image)
        }
    }
}

补充说明 #

• 若要调用相机，需将ImagePicker中的sourceType改为.camera，同时在Info.plist中添加相机权限申请：NSCameraUsageDescription（填写相机使用目的）
• 访问相册需在Info.plist中添加NSPhotoLibraryUsageDescription权限配置

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