我想使用任何关闭路径裁剪图像，如UIBezierPath。它可以在iPhone应用程序？ [英] i want to crop image using any close path like UIBezierPath. it is possible in iPhone application?

问题描述

我想使用任何关闭路径（如UIBezierPath）在我的iPhone应用中裁剪图像。我知道有可能使用矩形，但我想要不同形状的裁剪。就像我使用触摸制作一个形状，并希望裁剪图像，以便如何实现。
任何建议或帮助。
提前致谢。

i want to crop image in my iPhone app using any close path like UIBezierPath. i know it is possible using rectangle but i want crop in different shape. like i make one shape using touch and want to crop that image so how it is possible. any suggestion or help. Thanks in advance.

推荐答案

您可以使用shapelayer裁剪图像。要做到这一点，你必须创建一个路径，用作新图像的边框。你应该看一下这个问题。

You can crop your image with a shapelayer. To do it you have to create a path that will be used as borders for your new image. You should look at this question.

CALayer* contentLayer = [CALayer layer];
[contentLayer setFrame:CGRectMake(0, 0, 80, 80)];
CAShapeLayer* mask = [CAShapeLayer layer];

CGMutablePathRef path = CGPathCreateMutable();

CGPathMoveToPoint(path, NULL, 10, 10);
CGPathAddLineToPoint(path, NULL, 10, 80);
CGPathAddLineToPoint(path, NULL, 80, 80);
CGPathAddLineToPoint(path, NULL, 80, 10);
mask.path = path;

[contentLayer setContents:(id)[[UIImage imageNamed:@"image.png"] CGImage]];
[contentLayer setMask:mask];          

[[self layer]addSublayer:contentLayer];

这样的事情。

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