Blinking effect on UILabel

I have a UILabel with background color as grey.

I want a blinking effect on this label like it should become a little white & then become gray and it should keep happen till I turn it off programatically.

Any clue how to achieve this?

---

Use NSTimer

NSTimer *timer = [NSTimer 
                      scheduledTimerWithTimeInterval:(NSTimeInterval)(1.0)
                            target:self 
                             selector:@selector(blink) 
                             userInfo:nil 
                             repeats:TRUE];
BOOL blinkStatus = NO;

in your blink function

-(void)blink{
   if(blinkStatus == NO){
      yourLabel.backgroundColor = [UIColor whiteColor];
     blinkStatus = YES;
   }else {
      yourLabel.backgroundColor = [UIColor grayColor];
      blinkStatus = NO;
   }
}

---

You can do this within a block:

self.yourLabel.alpha = 1;
[UIView animateWithDuration:1.5 delay:0.5 options:UIViewAnimationOptionRepeat | UIViewAnimationOptionAutoreverse animations:^{
        self.yourLabel.alpha = 0;
} completion:nil];

So you dont need a second method.

---

斯威夫特3

extension UILabel {

    func startBlink() {
        UIView.animate(withDuration: 0.8,
              delay:0.0,
              options:[.allowUserInteraction, .curveEaseInOut, .autoreverse, .repeat],
              animations: { self.alpha = 0 }, 
              completion: nil)
    }

    func stopBlink() {
        layer.removeAllAnimations()
        alpha = 1
    }
}

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