在iOS 14上使用swift ui应用程序进行后台mp3下载

import SwiftUI

struct ContentView: View {
    var body: some View {
        Button(action: {
            // 在这里处理后台MP3下载操作
            let url = URL(string: "http://example.com/example.mp3")!
            let task = URLSession.shared.downloadTask(with: url) { (location, response, error) in
                // 下载完成后的处理逻辑
                if let location = location {
                    let destinationURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!.appendingPathComponent("example.mp3")
                    do {
                        try FileManager.default.moveItem(at: location, to: destinationURL)
                        print("MP3下载完成，保存在：\(destinationURL)")
                    } catch {
                        print("移动文件失败：\(error)")
                    }
                }
            }
            task.resume()
        }) {
            Text("开始下载MP3")
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}