如何在Swift中使用URLSession添加UIActivityIndicatorView？

let activityIndicator = UIActivityIndicatorView(style: .gray)

activityIndicator.center = view.center
view.addSubview(activityIndicator)

activityIndicator.startAnimating()

let url = URL(string: "https://example.com")!
let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
    // 处理请求结果
    DispatchQueue.main.async {
        activityIndicator.stopAnimating()
    }
}
task.resume()