UIAlertController中按钮内部显示的倒计时计时器，然后启用按钮swift

是否可以创建一个UIAlertController，该控制器有一个按钮，该按钮最初被禁用，然后有一个5，然后是4，然后是3..2..1，然后被启用

我希望用户能够真正阅读控制器内的消息，我认为这会让人非常恼火，从而阻止他们无意识地点击OK

如果可能的话，我将如何开始这样做

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谢谢

我们试图修改

UIAlertAction

的只读属性，这有点麻烦。然而，它对我来说很好。或者，您可以创建类似UIAlertController的自定义视图控制器：

var timer: NSTimer?
var timerCount: Int = 5    
func showAlertView() {
            let alertController = UIAlertController(title: "Title", message: "Message of alert", preferredStyle: .Alert)

            let okAction = UIAlertAction(title: "Ok", style: .Default, handler: nil)
            okAction.enabled = false

            alertController.addAction(okAction)
            alertController.addAction(UIAlertAction(title: "Cancel", style: .Cancel, handler: nil))
            presentViewController(alertController, animated: true) {
                self.timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: #selector(self.countDownTimer), userInfo: nil, repeats: true)
            }
        }

        func countDownTimer() {
            timerCount -= 1

            let alertController = presentedViewController as! UIAlertController
            let okAction = alertController.actions.first

            if timerCount == 0 {
                timer?.invalidate()
                timer = nil

                okAction?.setValue("Ok", forKey: "title")
                okAction?.enabled = true
            } else {
                okAction?.setValue("Ok \(timerCount)", forKey: "title")
            }
        }

这就是它的样子：

---

我们试图修改

UIAlertAction

的只读属性，这有点太麻烦了。然而，它对我来说很好。或者，您可以创建类似UIAlertController的自定义视图控制器：

var timer: NSTimer?
var timerCount: Int = 5    
func showAlertView() {
            let alertController = UIAlertController(title: "Title", message: "Message of alert", preferredStyle: .Alert)

            let okAction = UIAlertAction(title: "Ok", style: .Default, handler: nil)
            okAction.enabled = false

            alertController.addAction(okAction)
            alertController.addAction(UIAlertAction(title: "Cancel", style: .Cancel, handler: nil))
            presentViewController(alertController, animated: true) {
                self.timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: #selector(self.countDownTimer), userInfo: nil, repeats: true)
            }
        }

        func countDownTimer() {
            timerCount -= 1

            let alertController = presentedViewController as! UIAlertController
            let okAction = alertController.actions.first

            if timerCount == 0 {
                timer?.invalidate()
                timer = nil

                okAction?.setValue("Ok", forKey: "title")
                okAction?.enabled = true
            } else {
                okAction?.setValue("Ok \(timerCount)", forKey: "title")
            }
        }

这就是它的样子：

---

是的，您可以通过以下方式在特定间隔后启用警报操作：

func showAlert() {
    let alertview = UIAlertController(title: "title", message: "msg", preferredStyle: .Alert)
    let action = UIAlertAction(title: "OK", style: .Default, handler: nil)
    alertview.addAction(action)
    self.presentViewController(alertview, animated: true) { () -> Void in
        action.enabled = false
        NSTimer.scheduledTimerWithTimeInterval(5, target: self, selector: "enableBtn:", userInfo: action, repeats: false)

    }
}

func enableBtn(t: NSTimer){
    let info = t.userInfo as! UIAlertAction
    info.enabled = true
}

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希望它能帮助您：）

是的，您可以通过以下方式在特定间隔后启用警报操作：

func showAlert() {
    let alertview = UIAlertController(title: "title", message: "msg", preferredStyle: .Alert)
    let action = UIAlertAction(title: "OK", style: .Default, handler: nil)
    alertview.addAction(action)
    self.presentViewController(alertview, animated: true) { () -> Void in
        action.enabled = false
        NSTimer.scheduledTimerWithTimeInterval(5, target: self, selector: "enableBtn:", userInfo: action, repeats: false)

    }
}

func enableBtn(t: NSTimer){
    let info = t.userInfo as! UIAlertAction
    info.enabled = true
}

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希望对您有所帮助：）

非常感谢。以后会不会有麻烦？非常感谢。将来会有麻烦吗？