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    <p>The following set of routines create versions of a UIImage with either only the content <strong>inside</strong> a path, or only content <strong>outside</strong> that path. </p> <p>Both make use of the <code>compositeImage</code> method, which uses CGBlendMode. CGBlendMode is very powerful for masking anything you can draw against anything else you can draw. Calling compositeImage: with other blend modes can have interesting (if not always useful) effects. See the <a href="https://developer.apple.com/library/mac/#documentation/graphicsimaging/reference/CGContext/Reference/reference.html#//apple_ref/c/tdef/CGBlendMode" rel="noreferrer">CGContext Reference</a> for all the modes.</p> <p>The clipping method I described in my comment to your OP does work and is probably faster, but only if you have UIBezierPaths defining all the regions you want to clip.</p> <pre><code>- (UIImage*) compositeImage:(UIImage*) sourceImage onPath:(UIBezierPath*) path usingBlendMode:(CGBlendMode) blend; { // Create a new image of the same size as the source. UIGraphicsBeginImageContext([sourceImage size]); // First draw an opaque path... [path fill]; // ...then composite with the image. [sourceImage drawAtPoint:CGPointZero blendMode:blend alpha:1.0]; // With drawing complete, store the composited image for later use. UIImage *maskedImage = UIGraphicsGetImageFromCurrentImageContext(); // Graphics contexts must be ended manually. UIGraphicsEndImageContext(); return maskedImage; } - (UIImage*) maskImage:(UIImage*) sourceImage toAreaInsidePath:(UIBezierPath*) maskPath; { return [self compositeImage:sourceImage onPath:maskPath usingBlendMode:kCGBlendModeSourceIn]; } - (UIImage*) maskImage:(UIImage*) sourceImage toAreaOutsidePath:(UIBezierPath*) maskPath; { return [self compositeImage:sourceImage onPath:maskPath usingBlendMode:kCGBlendModeSourceOut]; } </code></pre>
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    1. PODivide UIImage into two parts along a UIBezierPath
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    1. COThank you! All regions are known.
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    2. COWhy not draw uiiview? UIImage *image=[self maskImage:beginImage toAreaInsidePath:Figure]; [image drawAtPoint:CGPointZero];
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    3. COPlease explain more. Are you trying to show the image inside a UIView? If so, putting those two lines inside the `drawRect` method should work.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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