iOS Swift: 20秒内发起100个URL的下载任务(并发)

let concurrentQueue = DispatchQueue(label: "com.example.concurrentQueue", attributes: .concurrent)

var completedTasks = 0
let taskCount = 100

for i in 1...taskCount {
    let url = URL(string: "https://example.com/file\(i).txt")!
    let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
        // 处理下载完成的数据
        if let data = data {
            // 处理下载完成的数据
        }
        
        // 更新计数器
        concurrentQueue.async(flags: .barrier) {
            completedTasks += 1
            if completedTasks == taskCount {
                // 所有任务已完成
            }
        }
    }
    task.resume()
}