Question

我有这个扩展名，我正在使用它作为一个闪光效果。它消失了，只有一次。

我该如何重复？

如何在用户输入之前重复此操作？ IBAction低于扩展名。

extension UIView {
func fadeIn(duration: NSTimeInterval = 1.0, delay: NSTimeInterval = 0.0, completion: ((Bool) -> Void) = {(finished: Bool) -> Void in}) {
UIView.animateWithDuration(duration, delay: delay, options: UIViewAnimationOptions.CurveEaseIn, animations: {
    self.alpha = 1.0
    }, completion: completion)  }

func fadeOut(duration: NSTimeInterval = 1.0, delay: NSTimeInterval = 0.0, completion: (Bool) -> Void = {(finished: Bool) -> Void in}) {
UIView.animateWithDuration(duration, delay: delay, options: UIViewAnimationOptions.CurveEaseIn, animations: {
    self.alpha = 0.0
    }, completion: completion)
}
}

单独IBAction

@IBAction func SendAge(sender: AnyObject) {


    let newAge = String(inputField.text!)

    if ((inputField.text?.isEmpty) != false) {

        self.sentence.blink()
        self.sentence.text = "Enter a number!"
        self.sentence.textColor = UIColor.redColor()
    }
    else {
        sentence.text = "Oh, you're \(newAge)"
        return()
    }

}

Answer 1

这是一种非常简单的方法：

extension UIView {

    func blink(duration: NSTimeInterval = 1.0) {
        self.alpha = 1
        UIView.animateWithDuration(duration, delay: 0,
            options: [.CurveEaseIn, .Autoreverse, .Repeat], animations: {
                self.alpha = 0
            }, completion: nil)
    }

}

要取消它，只需将视图的alpha设置为1。

Answer 2

您应该使用NSTimer scheduledTimerWithTimeInterval(interval: NSTimeInterval, target:, selector, userInfo:, repeats: bool)上可以设置为true的方法，只要计时器正在运行，这个方法就会运行。

如何重复fadeIn（持续时间：NSTimeInterval方法无限期？

2 个答案: