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POCABasicAnimation - Infinite scrolling of an image on retina device is garbled
 

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  1. POCABasicAnimation - Infinite scrolling of an image on retina device is garbled
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    <p>In a similar post, I found a solution to animating a scrolling image infinitely:</p> <p><a href="https://stackoverflow.com/questions/8790079/animate-infinite-scrolling-of-an-image-in-a-seamless-loop">Animate infinite scrolling of an image in a seamless loop</a></p> <p>While this solution works beautifully, there seems to be an issue when running on a retina device. In particular, I am running this project on an iPad only. A non-retina iPad 2 scrolls the image without any problems. But run on a retina iPad 3 or 4 the image is a mess! It's difficult to describe, but the best I can say is that it is garbled. Pixels are stretched every which way. It resembles a Jackson Pollak painting.</p> <p>Screen shot:</p> <p><a href="https://imgur.com/Q7n08kv" rel="nofollow noreferrer">http://imgur.com/Q7n08kv</a></p> <p>I tested this using a non-retina image (non 2x) and a retina version (@2x). The image is large - full screen (landscape) and is 4 panels wide (4096 x 768). I played around with smaller images but with the same result.</p> <p><strong>Is there a limitation with the scrolling functionality of CABasicAnimation that would affect retina devices?</strong> Here is the code I am using (as contributed by rob mayoff):</p> <pre><code>UIImage *crawlImage = [UIImage imageNamed:@"CrawlBackground.png"]; UIColor *crawlPattern = [UIColor colorWithPatternImage:crawlImage]; self.crawlLayer = [CALayer layer]; self.crawlLayer.backgroundColor = crawlPattern.CGColor; self.crawlLayer.transform = CATransform3DMakeScale(1, -1, 1); self.crawlLayer.anchorPoint = CGPointMake(0, 1); self.crawlLayer.frame = CGRectMake(0, 0, crawlImage.size.width + 1024, crawlImage.size.height); [self.backgroundCrawl.layer addSublayer:self.crawlLayer]; self.backgroundCrawl.layer.zPosition = 0; CGPoint startPoint = CGPointZero; CGPoint endPoint = CGPointMake(-crawlImage.size.width, 0); self.crawlLayerAnimation = [CABasicAnimation animationWithKeyPath:@"position"]; self.crawlLayerAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear]; self.crawlLayerAnimation.fromValue = [NSValue valueWithCGPoint:startPoint]; self.crawlLayerAnimation.toValue = [NSValue valueWithCGPoint:endPoint]; self.crawlLayerAnimation.repeatCount = HUGE_VALF; self.crawlLayerAnimation.duration = 30; // nn seconds to complete the cycle </code></pre>
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    1. USSteve Barden
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    1. COPerhaps you could upload a screen shot to imgur.com and post a link to it.
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      1. POCABasicAnimation - Infinite scrolling of an image on retina device is garbled
      1. USrob mayoff
    2. COI've edited the question and added a link to a screen capture of what the problem looks like.
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      1. POCABasicAnimation - Infinite scrolling of an image on retina device is garbled
      1. USSteve Barden
 

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