如何从 UIAlertController 中删除延迟? [英] How to remove delay from UIAlertController?

问题描述

点击表格单元格后，我的警报视图延迟了 4 到 5 秒.下面是代码

After I tap table cells, I am getting a delay of 4 to 5 seconds for the alert view to display. Below is the code

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){

let cell = tableView.cellForRow(at: indexPath)!
let alertController = UIAlertController(title: nil, message: nil, preferredStyle: .alert)

let ok = UIAlertAction(title: "Ok", style: .default, handler: { (action) -> Void in
    let cell = tableView.cellForRow(at: indexPath)!
    })
let cancel = UIAlertAction(title: "Cancel", style: .cancel, handler: { (action) -> Void in
})
   alertController.addAction(ok)
   alertController.addAction(cancel)

present(alertController, animated: true, completion: nil)
}

如何避免这种延迟?

推荐答案

当我们处理 UI 时，重要的是它必须在主要步骤上完成.因此，只需复制显示警报的代码并粘贴到调度主线程块中即可.

When we deal with UI, then its important that it must be done on main tread. So just copy your code of showing alert and paste in dispatch main thread block.

DispatchQueue.main.async {
   let alertController = UIAlertController(title: nil, message: nil, preferredStyle: .alert)

let ok = UIAlertAction(title: "Ok", style: .default, handler: { (action) -> Void in
    let cell = tableView.cellForRow(at: indexPath)!
    })
let cancel = UIAlertAction(title: "Cancel", style: .cancel, handler: { (action) -> Void in
})
   alertController.addAction(ok)
   alertController.addAction(cancel)

present(alertController, animated: true, completion: nil)
}

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