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NSInteger scale = (int)[[UIScreen mainScreen] scale];
UIImage *image = nil;
while (scale > 0 && !image)
{
    NSString *fileName = [imageName stringByAppendingString:scale > 1 ? [NSString stringWithFormat:@"@%dx", scale] : @".png"];
    NSString *filePath = [[NSBundle mainBundle] pathForResource:fileName ofType:@"png"];
    image = [UIImage imageWithContentsOfFile:filePath];
    scale--;
}