Core

- (void)blinkAnimation:(NSString *)animationID finished:(BOOL)finished target:(UIView *)targetView
{
    NSString *selectedSpeed = [[NSUserDefaults standardUserDefaults] stringForKey:@"EffectSpeed"];
    float speedFloat = (0.40 - [selectedSpeed floatValue]);
 
    [UIView beginAnimations:animationID context:(__bridge void *)(targetView)];
    [UIView setAnimationDuration:speedFloat];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDidStopSelector:@selector(blinkAnimation:finished:targetView:)];
 
    if([targetView alpha] == 1.0f)  
        [targetView setAlpha:0.0f];
    else
        [targetView setAlpha:1.0f];
    [UIView commitAnimations];
}
 
- (void)lblRetrieveBlinkAnimation
{
 
    [self blinkAnimation:@"blinkAnimation" finished:YES target:lblRetrievingData];
}