当url更改SwiftUI时强制重新加载图像

import SwiftUI

struct ContentView: View {
    @State private var imageURL: URL? = URL(string: "https://example.com/image.jpg")
    @State private var reloadTrigger = false

    var body: some View {
        VStack {
            if let url = imageURL {
                AsyncImage(url: url, reloadTrigger: reloadTrigger)
                    .frame(width: 200, height: 200)
            } else {
                Text("Image URL is invalid")
            }

            Button("Change URL") {
                imageURL = URL(string: "https://example.com/another_image.jpg")
                reloadTrigger.toggle()
            }
        }
    }
}

struct AsyncImage: View {
    let url: URL
    let reloadTrigger: Bool

    var body: some View {
        ImageLoader(url: url, reloadTrigger: reloadTrigger)
            .resizable()
            .aspectRatio(contentMode: .fit)
    }
}

struct ImageLoader: View {
    @StateObject private var imageLoader: ImageLoaderService

    init(url: URL, reloadTrigger: Bool) {
        _imageLoader = StateObject(wrappedValue: ImageLoaderService(url: url, reloadTrigger: reloadTrigger))
    }

    var body: some View {
        if let image = imageLoader.image {
            Image(uiImage: image)
        } else {
            ProgressView()
        }
    }
}

class ImageLoaderService: ObservableObject {
    @Published var image: UIImage?
    private var url: URL
    private var reloadTrigger: Bool

    init(url: URL, reloadTrigger: Bool) {
        self.url = url
        self.reloadTrigger = reloadTrigger
        loadImage()
    }

    private func loadImage() {
        // Perform image loading logic here
        // You can use URLSession or any other image loading library

        // Example using URLSession
        URLSession.shared.dataTask(with: url) { data, _, _ in
            if let data = data {
                DispatchQueue.main.async {
                    self.image = UIImage(data: data)
                }
            }
        }.resume()
    }

    private func reloadImage() {
        // Perform image reloading logic here
        // This method will be called when reloadTrigger changes
        // You can re-fetch the image using the updated URL
        // and update the `image` property
    }
}