UIImageview 遮罩效果

簡單的讓一張普通圖片變形，如圖：

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實現(xiàn)方式1： ... 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 appliedreturn maskedImage; }

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實現(xiàn)方式2：

#import <QuartzCore/QuartzCore.h> // remember to include Framework as well CALayer *mask = [CALayer layer]; mask.contents = (id)[[UIImage imageNamed:@"mask.png"] CGImage]; mask.frame = CGRectMake(0, 0, <img_width>, <img_height>); yourImageView.layer.mask = mask; yourImageView.layer.masksToBounds = YES;

注意，使用方法2時，必須配合[view.layer setMasksToBounds:YES]使用！！

posted on 2013-04-09 16:51 韓超2012 閱讀(...) 評論(...) 編輯 收藏

轉(zhuǎn)載于:https://www.cnblogs.com/hanchao/archive/2013/04/09/3010421.html

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