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copied!<p>Before all, I am afraid that may cause memory warning if you load all 48 images in to memory, check it with Instrument.</p> <p>================================</p> <p>You probably need to force it do the decompressing and rendering before, check this <a href="https://stackoverflow.com/questions/14116194/any-way-to-encode-a-png-faster-than-uiimagepngrepresentation">link1</a> and this <a href="http://www.cocoanetics.com/2011/10/avoiding-image-decompression-sickness/" rel="nofollow noreferrer">link2</a></p> <p>Try this, it causes the image to decompress, even though the image context is just 1 pixel large.:</p> <pre><code>UIGraphicsBeginImageContext(CGSizeMake(1, 1)); [decompressedImage drawAtPoint:CGPointZero]; UIGraphicsEndImageContext(); </code></pre> <p>or something like this:</p> <pre><code>CGDataProviderRef imageDataProvider = CGDataProviderCreateWithCFData((__bridge CFDataRef)imageData); CGImageRef image = CGImageCreateWithJPEGDataProvider(imageDataProvider, NULL, NO, kCGRenderingIntentDefault); CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef bitmapContext = CGBitmapContextCreate(NULL, CGImageGetWidth(image), CGImageGetHeight(image), CGImageGetBitsPerComponent(image), 0, colorSpace, kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Little); CGColorSpaceRelease(colorSpace); CGContextDrawImage(bitmapContext, CGRectMake(0, 0, CGImageGetWidth(image), CGImageGetHeight(image)), image); CGDataProviderRelease(imageDataProvider); CGContextRelease(bitmapContext); if (image){ decompressedImage = [UIImage imageWithCGImage:image]; CGImageRelease(image); } </code></pre> <p>Hope this is helpful.</p>

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