小编Mar*_*Dev的帖子

任何人都可以告诉我如何验证UITextFields内部UIAlertController？

除非输入两个字段,否则我需要它来阻止用户单击"保存".

到目前为止,这是我的代码:

@IBAction func btnStart(sender: AnyObject) {
    var alert = UIAlertController(title: "New user",
        message: "Add a new user",
        preferredStyle: .Alert)

    let saveAction = UIAlertAction(title: "Save",
        style: .Default) { (action: UIAlertAction!) -> Void in

            self.textFieldName = alert.textFields![0] as UITextField
            self.textFieldEmail = alert.textFields![1] as UITextField
            self.saveUser(self.textFieldName.text, email: self.textFieldEmail.text)
            self.tableView.reloadData()
    }

    saveAction.enabled = false

    let cancelAction = UIAlertAction(title: "Cancel",
        style: .Default) { (action: UIAlertAction!) -> Void in
    }

    alert.addTextFieldWithConfigurationHandler {
        (textFieldName: UITextField!) in
        textFieldName.placeholder = "Enter full name" …

我需要构建一个iOS Swift单页面应用程序,它具有60:00分钟的倒数计时器.2秒后,我需要显示一个UILabel,在6秒后隐藏它,然后显示另一个文本.到目前为止这是我的代码:

var startTime = NSTimeInterval()
var timer = NSTimer()

func startCountdownTimer() {

    var currentTime = NSDate.timeIntervalSinceReferenceDate()

    //Find the difference between current time and start time.
    var elapsedTime: NSTimeInterval = 3600-(currentTime-startTime)

    //Calculate the minutes in elapsed time.
    let minutes = UInt8(elapsedTime / 60.0)
    elapsedTime -= (NSTimeInterval(minutes) * 60)

    //Calculate the seconds in elapsed time.
    var seconds = UInt8(elapsedTime)
    elapsedTime -= NSTimeInterval(seconds)

    //Add the leading zero for minutes and seconds and store them as string constants
    let strMinutes = …