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POHow to make UIButton use a masked image correctly?
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  1. POHow to make UIButton use a masked image correctly?
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    copied!<p>I’m creating a UIButton programmatically and then adding a masked image with setImage:</p> <pre><code>CGRect photoFrame = CGRectMake(11, 11, 180, 120); UIButton *cardPhotoButton = [[UIButton alloc] initWithFrame:photoFrame]; cardPhotoButton.backgroundColor = [UIColor clearColor]; UIImage *cardPhoto = [[UIImage alloc] init]; cardPhoto = [self maskImage: [UIImage imageNamed:[metaDict objectForKey:@"Photo"]] withMask:[UIImage imageNamed:@"CardPhotoFrame.png"]]; [cardPhotoButton setImage:cardPhoto forState:UIControlStateNormal]; cardPhotoButton.contentMode = UIViewContentModeScaleAspectFit; [self addSubview:cardPhotoButton]; </code></pre> <p>The masking is done with this method I got from the web:</p> <pre><code>- (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 masked = CGImageCreateWithMask([image CGImage], mask); return [UIImage imageWithCGImage:masked]; } </code></pre> <p>Now, the problem is that the masking for the default state does not work, but weirdly when I actually click on the button and the button goes to "highlighted" state, the transparent parts of the masked image start to work.</p> <p>I’m guessing I need to set somekind of BG color to clearColor somewhere, but I’ve tried them all and none work.</p> <p>Any ideas what I might be missing?</p>
 

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