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POHow to change UIImage of UIImageView after duration (blinking effect)
 

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  1. POHow to change UIImage of UIImageView after duration (blinking effect)
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    <p>I am trying to animate the blinking between two images on an imageview to draw the user's attention to an indicator to noticing the change. I would like the image to only blink one or two times before remaining on the new image. The timeline of events would be something like the following:</p> <ol> <li>Old image has been set and is waiting for a particular event to occur. </li> <li>Event occurs and blinking animation begins. New image is displayed for 0.25 seconds.</li> <li>Old image is displayed for 0.25 seconds. </li> <li>New image is displayed for 0.25 seconds. Animation ends. </li> </ol> <p>Due to the short timeframe of the animation I was under the impression that there was a way to do this without using a NSTimer. My current attempt is below</p> <pre><code>+(void)blinkImage:(UIImageView*)view toNewImage:(UIImage*)newImage numOfTimes:(int)numOfTimes{ float waitInterval = 0.25; float totalWaitTime = 0.0; UIImage *oldImage = view.image; view.image = newImage; totalWaitTime = totalWaitTime+waitInterval; for (int times = 0; times&lt;numOfTimes; times++) { [UIView beginAnimations:@"setOld" context:nil]; [UIView setAnimationDelay:totalWaitTime]; [UIView setAnimationDuration:waitInterval]; view.image = oldImage; totalWaitTime = totalWaitTime+waitInterval; NSLog(@"SetOld; waitTime %f", totalWaitTime); [UIView commitAnimations]; [UIView beginAnimations:@"setNew" context:nil]; [UIView setAnimationDelay:totalWaitTime]; [UIView setAnimationDuration:waitInterval]; view.image = newImage; totalWaitTime = totalWaitTime+waitInterval; NSLog(@"SetNew; waitTime %f", totalWaitTime); [UIView commitAnimations]; } } </code></pre> <p>However, this did not yield the expected results. With the above code, the view simply changed to the new image and did nothing more. </p> <p>Any help would be greatly appreciated. Thanks in advance!</p>
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