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1. Animating layer opacity

   - (void)startPulsing {
       CABasicAnimation* a = [CABasicAnimation animation];
   
       a.keyPath = @"opacity";
       a.fromValue = [NSNumber numberWithFloat:1.0];
       a.toValue = [NSNumber numberWithFloat:0.8];
       a.duration = 1.0;
       a.repeatCount = HUGE_VALF;
       a.autoreverses = YES;
       a.timingFunction = [CAMediaTimingFunction
                           functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
   
       [self.layer addAnimation:a forKey:@"pulseAnimation"];
   }