force decoding of UIImage on load on iOS7 (so it can be done on a background thread not the UI thread).

gistfile1.m

+(UIImage*)immediateImageWithData:(NSData*)data
{
    CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);
    CGImageRef cgImage = CGImageSourceCreateImageAtIndex(source, 0, (__bridge CFDictionaryRef)@{(id)kCGImageSourceShouldCacheImmediately: (id)kCFBooleanTrue});
    
    UIImage *temp = [UIImage imageWithCGImage:cgImage];

    CGImageRelease(cgImage);
    CFRelease(source);
    
    return temp;
}