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2013-03-07T12:05:02.073
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Hope it is helpful Step 1: Create a mask without any alpha channel. Step 2: Create a invert mask by following method <pre><code>- (UIImage*)createInvertMask:(UIImage *)maskImage withTargetImage:(UIImage *) image { CGImageRef maskRef = maskImage.CGImage; CGBitmapInfo bitmapInfo = kCGImageAlphaNone; CGColorRenderingIntent renderingIntent = kCGRenderingIntentDefault; CGImageRef mask = CGImageCreate(CGImageGetWidth(maskRef), CGImageGetHeight(maskRef), CGImageGetBitsPerComponent(maskRef), CGImageGetBitsPerPixel(maskRef), CGImageGetBytesPerRow(maskRef), CGColorSpaceCreateDeviceGray(), bitmapInfo, CGImageGetDataProvider(maskRef), nil, NO, renderingIntent); CGImageRef masked = CGImageCreateWithMask([image CGImage], mask); CGImageRelease(mask); CGImageRelease(maskRef); return [UIImage imageWithCGImage:masked]; } </code></pre> Step 3: Set the invert mask to a UIView by following method <pre><code>- (void)maskWithImage:(UIImage*) maskImage TargetView:(UIView*) targetView { CALayer *_maskingLayer = [CALayer layer]; _maskingLayer.frame = targetView.bounds; [_maskingLayer setContents:(id)[maskImage CGImage]]; [targetView.layer setMask:_maskingLayer]; } </code></pre> Finished. How to call? <pre><code>UIImage* targetImage = [UIImage imageNamed:@"sky_bg.png"]; UIImage* mask = [UIImage imageNamed:@"mask01.png"]; UIImage* invertMask = [self createInvertMask:mask withTargetImage:targetImage]; [self maskWithImage:invertMask TargetView:targetview]; </code></pre>
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1. POHow to create reverse masks on CALayers
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