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    <p>I would recommend using Core Animation. Try something like this:</p> <pre><code>-(void) flash{ [UIView beginAnimations:nil context:NULL]; [UIView setAnimationDuration:0.3f]; [UIView setAnimationCurve:UIViewAnimationCurveLinear]; if( emergency ){ // Start flashing [UIView setAnimationRepeatCount:1000]; [UIView setAnimationRepeatAutoreverses:YES]; [btn setAlpha:0.0f]; }else{ // Stop flashing [UIView setAnimationBeginsFromCurrentState:YES]; [UIView setAnimationRepeatCount:1]; [btn setAlpha:1.0f]; } emergency = !emergency; [UIView commitAnimations]; } </code></pre> <p>Where btn is declared as</p> <pre><code>@property(nonatomic, retain) IBOutlet UIButton *btn; </code></pre> <p>and emergency is a simple BOOL variable.</p> <p>Call flash to start and to stop the animation.</p> <p>In this example we animate the alpha attribute for simplicity, but you can do the same with the button backcolor, as Sam said in his answer, or whatever attribute you like.</p> <p>Hope it helps.</p> <p><strong>UPDATE:</strong></p> <p>Regarding making the transition between two images, try calling <code>imageFlash</code> instead of <code>flash</code>:</p> <pre><code>-(void) imageFlash{ CABasicAnimation *imageAnimation = [CABasicAnimation animationWithKeyPath:@"contents"]; [btn setImage:normalState forState:UIControlStateNormal]; if( emergency ){ imageAnimation.duration = 0.5f; imageAnimation.repeatCount = 1000; }else{ imageAnimation.repeatCount = 1; } imageAnimation.fromValue = (id)normalState.CGImage; imageAnimation.toValue = (id)emergencyState.CGImage; [btn.imageView.layer addAnimation:imageAnimation forKey:@"animateContents"]; [btn setImage:normalState forState:UIControlStateNormal]; // Depending on what image you want after the animation. emergency = !emergency; } </code></pre> <p>Where <code>normalState</code> and <code>emergencyState</code> are the images you want to use:</p> <p>Declared as:</p> <pre><code>UIImage *normalState; UIImage *emergencyState; </code></pre> <p>Assigning the images:</p> <pre><code>normalState = [UIImage imageNamed:@"normal.png"]; emergencyState = [UIImage imageNamed:@"alert.png"]; </code></pre> <p>Good luck!</p>
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    1. POHow to flash a button on UI thread?
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    1. COThank you for this. This is a good idea; for some reason I did not think of Core Animation at all... however, my button consists of two images: One for off and one for on. Is there a way of animating the transition between the two images?
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    2. COSee updated answer :)
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