blocks|key|705398|text|有一种更简单的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|705399|#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;|code-block|syntax|javascript|705400|对于Swift+4和更高版本，请遵循以下代码|705401|let+mask+=+CALayer()
mask.contents+=++[+UIImage(named:+"right_challenge_bg")?.cgImage]+as+Any
mask.frame+=+CGRect(x:+0,+y:+0,+width:+leftBGImage.frame.size.width,+height:+leftBGImage.frame.size.height)
leftBGImage.layer.mask+=+mask
leftBGImage.layer.masksToBounds+=+true|705402|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

There's an easier way.

<pre><code>#import &lt;QuartzCore/QuartzCore.h&gt;
// remember to include Framework as well

CALayer *mask = [CALayer layer];
mask.contents = (id)[[UIImage imageNamed:@"mask.png"] CGImage];
mask.frame = CGRectMake(0, 0, &lt;img_width&gt;, &lt;img_height&gt;);
yourImageView.layer.mask = mask;
yourImageView.layer.masksToBounds = YES;
</code></pre>

For Swift 4 and plus follow code below

<pre><code>let mask = CALayer()
mask.contents = [ UIImage(named: "right_challenge_bg")?.cgImage] as Any
mask.frame = CGRect(x: 0, y: 0, width: leftBGImage.frame.size.width, height: leftBGImage.frame.size.height)
leftBGImage.layer.mask = mask
leftBGImage.layer.masksToBounds = true
</code></pre>

blocks|key|921844|text|-+(UIImage*)+maskImage:(UIImage+*)image+withMask:(UIImage+*)maskImage+{
++++++++CGColorSpaceRef+colorSpace+=+CGColorSpaceCreateDeviceRGB();

++++++++CGImageRef+maskImageRef+=+[maskImage+CGImage];

++++++++//+create+a+bitmap+graphics+context+the+size+of+the+image
++++++++CGContextRef+mainViewContentContext+=+CGBitmapContextCreate+(NULL,+maskImage.size.width,+maskImage.size.height,+8,+0,+colorSpace,+kCGImageAlphaPremultipliedLast);
++++++++CGColorSpaceRelease(colorSpace);

++++++++if+(mainViewContentContext==NULL)
++++++++++++return+NULL;

++++++++CGFloat+ratio+=+0;

++++++++ratio+=+maskImage.size.width/+image.size.width;

++++++++if(ratio+*+image.size.height+<+maskImage.size.height)+{
++++++++++++ratio+=+maskImage.size.height/+image.size.height;
++++++++}

++++++++CGRect+rect1++=+{{0,+0},+{maskImage.size.width,+maskImage.size.height}};
++++++++CGRect+rect2++=+{{-((image.size.width*ratio)-maskImage.size.width)/2+,+-((image.size.height*ratio)-maskImage.size.height)/2},+{image.size.width*ratio,+image.size.height*ratio}};


++++++++CGContextClipToMask(mainViewContentContext,+rect1,+maskImageRef);
++++++++CGContextDrawImage(mainViewContentContext,+rect2,+image.CGImage);


++++++++//+Create+CGImageRef+of+the+main+view+bitmap+content,+and+then
++++++++//+release+that+bitmap+context
++++++++CGImageRef+newImage+=+CGBitmapContextCreateImage(mainViewContentContext);
++++++++CGContextRelease(mainViewContentContext);

++++++++UIImage+*theImage+=+[UIImage+imageWithCGImage:newImage];

++++++++CGImageRelease(newImage);

++++++++//+return+the+image
++++++++return+theImage;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|921845|这对我很有效。|unstyled|921846|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>- (UIImage*) maskImage:(UIImage *)image withMask:(UIImage *)maskImage {
 CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

 CGImageRef maskImageRef = [maskImage CGImage];

 // create a bitmap graphics context the size of the image
 CGContextRef mainViewContentContext = CGBitmapContextCreate (NULL, maskImage.size.width, maskImage.size.height, 8, 0, colorSpace, kCGImageAlphaPremultipliedLast);
 CGColorSpaceRelease(colorSpace);

 if (mainViewContentContext==NULL)
 return NULL;

 CGFloat ratio = 0;

 ratio = maskImage.size.width/ image.size.width;

 if(ratio * image.size.height &lt; maskImage.size.height) {
 ratio = maskImage.size.height/ image.size.height;
 }

 CGRect rect1 = {{0, 0}, {maskImage.size.width, maskImage.size.height}};
 CGRect rect2 = {{-((image.size.width*ratio)-maskImage.size.width)/2 , -((image.size.height*ratio)-maskImage.size.height)/2}, {image.size.width*ratio, image.size.height*ratio}};


 CGContextClipToMask(mainViewContentContext, rect1, maskImageRef);
 CGContextDrawImage(mainViewContentContext, rect2, image.CGImage);


 // Create CGImageRef of the main view bitmap content, and then
 // release that bitmap context
 CGImageRef newImage = CGBitmapContextCreateImage(mainViewContentContext);
 CGContextRelease(mainViewContentContext);

 UIImage *theImage = [UIImage imageWithCGImage:newImage];

 CGImageRelease(newImage);

 // return the image
 return theImage;
}
</code></pre>

This works for me.

blocks|key|921898|text|公认解决方案的Swift版本：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|921899|func+maskImage(image:+UIImage,+withMask+maskImage:+UIImage)+->+UIImage+{

++++let+maskRef+=+maskImage.CGImage

++++let+mask+=+CGImageMaskCreate(
++++++++CGImageGetWidth(maskRef),
++++++++CGImageGetHeight(maskRef),
++++++++CGImageGetBitsPerComponent(maskRef),
++++++++CGImageGetBitsPerPixel(maskRef),
++++++++CGImageGetBytesPerRow(maskRef),
++++++++CGImageGetDataProvider(maskRef),
++++++++nil,
++++++++false)

++++let+masked+=+CGImageCreateWithMask(image.CGImage,+mask)
++++let+maskedImage+=+UIImage(CGImage:+masked)!

++++//+No+need+to+release.+Core+Foundation+objects+are+automatically+memory+managed.

++++return+maskedImage

}|code-block|syntax|javascript|921900|以防有人需要它。|921901|它对我来说是完美无瑕的。|921902|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Swift version of the accepted solution:

<pre><code>func maskImage(image: UIImage, withMask maskImage: UIImage) -&gt; UIImage {

 let maskRef = maskImage.CGImage

 let mask = CGImageMaskCreate(
 CGImageGetWidth(maskRef),
 CGImageGetHeight(maskRef),
 CGImageGetBitsPerComponent(maskRef),
 CGImageGetBitsPerPixel(maskRef),
 CGImageGetBytesPerRow(maskRef),
 CGImageGetDataProvider(maskRef),
 nil,
 false)

 let masked = CGImageCreateWithMask(image.CGImage, mask)
 let maskedImage = UIImage(CGImage: masked)!

 // No need to release. Core Foundation objects are automatically memory managed.

 return maskedImage

}
</code></pre>

Just in case someone need it.

It`s working for me flawlessly.

blocks|key|922004|text|我们发现，正确的答案现在不起作用了，并实现了一些插件类，这有助于在UIImageView中掩蔽任何图像。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|922005|你可以在这里找到：https://github.com/Werbary/WBMaskedImageView|offset|length|922006|示例：|922007|WBMaskedImageView+*imgView+=+[[WBMaskedImageView+alloc]+initWithFrame:frame];
imgView.originalImage+=+[UIImage+imageNamed:@"original_image.png"];
imgView.maskImage+=+[UIImage+imageNamed:@"mask_image.png"];|code-block|syntax|javascript|922008|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/Werbary/WBMaskedImageView^0|0|9|18|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@$D|W|E|X|1|Y]]|A|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|10|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

we found, that correct answer is not working now and implemented little drop-in class, which helps to mask any image in UIImageView.

It's available here: <a href="https://github.com/Werbary/WBMaskedImageView" rel="nofollow">https://github.com/Werbary/WBMaskedImageView</a>

Example:

<pre><code>WBMaskedImageView *imgView = [[WBMaskedImageView alloc] initWithFrame:frame];
imgView.originalImage = [UIImage imageNamed:@"original_image.png"];
imgView.maskImage = [UIImage imageNamed:@"mask_image.png"];
</code></pre>

blocks|key|922049|text|SWIFT+3+XCODE+8.1|type|unstyled|depth|inlineStyleRanges|entityRanges|data|922050|func+maskImage(image:+UIImage,+withMask+maskImage:+UIImage)+->+UIImage+{

++++let+maskRef+=+maskImage.cgImage

++++let+mask+=+CGImage(
++++++++maskWidth:+maskRef!.width,
++++++++height:+maskRef!.height,
++++++++bitsPerComponent:+maskRef!.bitsPerComponent,
++++++++bitsPerPixel:+maskRef!.bitsPerPixel,
++++++++bytesPerRow:+maskRef!.bytesPerRow,
++++++++provider:+maskRef!.dataProvider!,
++++++++decode:+nil,
++++++++shouldInterpolate:+false)

++++let+masked+=+image.cgImage!.masking(mask!)
++++let+maskedImage+=+UIImage(cgImage:+masked!)

++++//+No+need+to+release.+Core+Foundation+objects+are+automatically+memory+managed.

++++return+maskedImage

}|code-block|syntax|javascript|922051|//供使用|922052|testImage.image+=+maskImage(image:+UIImage(named:+"OriginalImage")!,+withMask:+UIImage(named:+"maskImage")!)|922053|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

SWIFT 3 XCODE 8.1

<pre><code>func maskImage(image: UIImage, withMask maskImage: UIImage) -&gt; UIImage {

 let maskRef = maskImage.cgImage

 let mask = CGImage(
 maskWidth: maskRef!.width,
 height: maskRef!.height,
 bitsPerComponent: maskRef!.bitsPerComponent,
 bitsPerPixel: maskRef!.bitsPerPixel,
 bytesPerRow: maskRef!.bytesPerRow,
 provider: maskRef!.dataProvider!,
 decode: nil,
 shouldInterpolate: false)

 let masked = image.cgImage!.masking(mask!)
 let maskedImage = UIImage(cgImage: masked!)

 // No need to release. Core Foundation objects are automatically memory managed.

 return maskedImage

}
</code></pre>

// for use

<pre><code>testImage.image = maskImage(image: UIImage(named: "OriginalImage")!, withMask: UIImage(named: "maskImage")!)
</code></pre>

I am trying to mask an image with something like this:

<img src="https://i.stack.imgur.com/0PeR9.png" alt="image to be masked">

Would you please help me? 

I am using this code:

<pre><code>- (void) viewDidLoad {
 UIImage *OrigImage = [UIImage imageNamed:@"dogs.png"];
 UIImage *mask = [UIImage imageNamed:@"mask.png"];
 UIImage *maskedImage = [self maskImage:OrigImage withMask:mask];
 myUIIMage.image = maskedImage;
}
</code></pre>

How can I mask a UIImageView?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在尝试用下面这样的东西来遮罩一个图像：​​你能帮帮我吗？我使用的是以下代码：- (void) viewDidLoad {    UIImage *OrigImage = [UIImage imageNamed:@"dogs.png"];    UIImage *mask = [UIImage imageNamed:...

问如何掩码UIImageView？
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问如何掩码UIImageView？
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