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    <p>The tutorial uses this method with two parameters: <code>image</code> and <code>maskImage</code>, these you have to set when you call the method. An example call could look like this, assuming the method is in the same class and the pictures are in your bundle:</p> <p>Note - amazingly the images do not even have to be the same size.</p> <pre><code>... UIImage *image = [UIImage imageNamed:@"dogs.png"]; UIImage *mask = [UIImage imageNamed:@"mask.png"]; // result of the masking method UIImage *maskedImage = [self maskImage:image withMask:mask]; ... - (UIImage*) maskImage:(UIImage *)image withMask:(UIImage *)maskImage { CGImageRef maskRef = maskImage.CGImage; CGImageRef mask = CGImageMaskCreate(CGImageGetWidth(maskRef), CGImageGetHeight(maskRef), CGImageGetBitsPerComponent(maskRef), CGImageGetBitsPerPixel(maskRef), CGImageGetBytesPerRow(maskRef), CGImageGetDataProvider(maskRef), NULL, false); CGImageRef maskedImageRef = CGImageCreateWithMask([image CGImage], mask); UIImage *maskedImage = [UIImage imageWithCGImage:maskedImageRef]; CGImageRelease(mask); CGImageRelease(maskedImageRef); // returns new image with mask applied return maskedImage; } </code></pre> <p>After you provided your code I have added some numbers as comments to it for reference. You still have two options. This whole thing is a method, which you are calling somewhere. You don't need to create the images inside it: this reduces the reusability of the method to zero. </p> <p>To get your code working. Change the methods head (<strong>1.</strong>) to</p> <pre><code>- (UIImage *)maskImageMyImages { </code></pre> <p>Then change the name of the variable in <strong>2.</strong> to</p> <pre><code>UIImage *maskImage = [UIImage imageNamed:@"mask.png"]; </code></pre> <p>The method will return your masked images so you'll have to call this method in some place. Can you show us the code where you are calling your method?</p>
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    1. POHow can I mask a UIImageView?
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    1. USNick Weaver
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    1. COsorry ! where should write `UIImage *image` code ? !!! because on `-(UIimage *) maskeImage` compiler gives redefinition error !
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    2. COCan you post your code in your question?
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    3. COsee my edited question
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