Add a pulsating image to a new CALayer centred on an existing view.
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// Somewhere in the setup code, possible awakeFromNib if relevant. NOT in drawRect:! UIImage *img = [UIImage imageNamed:@"BigHand"]; UIGraphicsBeginImageContext(img.size); [img drawAtPoint:CGPointMake(0, 0)]; // handy! CALayer *newLayer = [CALayer layer]; newLayer.bounds = CGRectMake(0, 0, img.size.width, img.size.height); newLayer.position = CGPointMake(self.layer.bounds.size.width/2.0, self.layer.bounds.size.height/2.0); // centred newLayer.contentsScale = self.layer.contentsScale; // for retina compat. Make sure you've set you view's main layer newLayer.contents = (__bridge id)UIGraphicsGetImageFromCurrentImageContext().CGImage; newLayer.opacity = 1.0; UIGraphicsEndImageContext(); // Create the animation... CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"opacity"]; anim.fromValue = [NSNumber numberWithFloat:0.6]; anim.toValue = [NSNumber numberWithFloat:1.0]; anim.duration = 0.7; anim.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]; anim.autoreverses = YES; anim.repeatCount = HUGE_VALF; // repeat forever [newLayer addAnimation:anim forKey:@"opacity"]; [self.layer addSublayer:newLayer]; |