Question

I have a button in a NIB file that plays a sound and calls this method below.

-(void) animateHeart
{
    heartLayer = [[CALayer alloc] init];
    [heartLayer setBounds:CGRectMake(0.0, 0.0, 85.0, 85.0)];
    [heartLayer setPosition:CGPointMake(150.0, 100.0)]; 

    UIImage *heartImage = [UIImage imageNamed:@"heart.png"];
    CGFloat nativeWidth = CGImageGetWidth(heartImage.CGImage) / 3;
    CGFloat nativeHeight = CGImageGetHeight(heartImage.CGImage) / 3;

    CGRect  startFrame = CGRectMake(165.0, 145.0, nativeWidth, nativeHeight);
    heartLayer.contents = (id)heartImage.CGImage;
    heartLayer.frame = startFrame;
    [self.view.layer addSublayer:heartLayer];

    CABasicAnimation *theAnimation;

    theAnimation=[CABasicAnimation animationWithKeyPath:@"opacity"];
    theAnimation.duration=2.5;
    theAnimation.repeatCount=2;
    theAnimation.speed = 1.85;
    theAnimation.autoreverses=YES;
    theAnimation.timingFunction = [CAMediaTimingFunction functionWithName: kCAMediaTimingFunctionEaseInEaseOut];
    theAnimation.fromValue=[NSNumber numberWithFloat:0.0];
    theAnimation.toValue=[NSNumber numberWithFloat:1.0];
    [theAnimation setValue:heartLayer forKey:@"parentLayer"];

    [heartLayer addAnimation:theAnimation forKey:@"animateOpacity"];

    theAnimation.fillMode = kCAFillModeRemoved;
    theAnimation.removedOnCompletion = YES;


}

The method animates the image perfectly fine but after having done so, the image is left hanging there on the view despite having set the removedOnCompletion BOOL to true. I would like to have the image disappear once the animation has completed. I’d appreciate any help I could get here.

Thank you in advance, SO.

Answer 1

Setting removedOnCompletion to YES ensures that the animation is removed from the image’s layer on completion, not that the image layer is removed from the superlayer. You need to add a delegate, track the completion event, and call removeFromSuperview on your view. Implement - (void)animationDidStart:(CAAnimation *)theAnimation method on the delegate, then call [heartLayer removeFromSuperlayer].