Blinking effect on UILabel

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.

Swift 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    }}

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;   }}