StackOverflow2013

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2013-02-04T19:11:18.760
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2013-03-04T19:47:21.100
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2013-03-04T19:47:21.100
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The <code>imageWithData:</code> method will always create an image with a scale of 1.0 (non-retina). Creating a retina-aware UIImage from a custom location outside the bundle, you need to use the <code>initWithCGImage:scale:orientation:</code> method: <pre><code>UIImage *image = [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://www.test.com/img2@2x.png"]]]; UIImage *retinaImage = [UIImage initWithCGImage:[image CGImage] scale:2.0 orientation:UIImageOrientationUp]; </code></pre> (and, obviously, you shouldn't download the image synchronously...). I needed to do the same thing (loading scale-dependent images from the documents directory) in my last project, so I've written a small convenience method in a UIImage category: <pre><code>- (id)initWithContentsOfResolutionIndependentFile:(NSString *)path { if([[UIScreen mainScreen] scale] == 2.0) { NSString *path2x = [[path stringByDeletingLastPathComponent] stringByAppendingPathComponent:[NSString stringWithFormat:@"%@@2x.%@", [[path lastPathComponent] stringByDeletingPathExtension], [path pathExtension]]]; if([[NSFileManager defaultManager] fileExistsAtPath:path2x]) { return [self initWithCGImage:[[UIImage imageWithData:[NSData dataWithContentsOfFile:path2x]] CGImage] scale:2.0 orientation:UIImageOrientationUp]; } } return [self initWithContentsOfFile:path]; } </code></pre> Usage: <pre><code>UIImage *myImage = [[UIImage alloc] initWithContentsOfResolutionIndependentFile:@"/path/to/image.png"]; </code></pre> This will try to load the image from <code>/path/to/image@2x.png</code> when on retina, and use <code>/path/to/image.png</code> otherwise.
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1. POSaving high-resolution resources so that the app knows it can use them on retina devices
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1. USDaniel Rinser
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1. USDaniel Rinser
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1. POSaving high-resolution resources so that the app knows it can use them on retina devices
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