在Objective-C中屏蔽视图 [英] Mask a view in Objective-C
本文介绍了在Objective-C中屏蔽视图的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
在 ActionScript 3 中,我们可以将掩码应用于这样的可视对象:
In ActionScript 3 we can apply a mask of to a visual object like this:
SomeVisualObject.mask = maskShapeObject;
如何在 Objective-C 中获得类似的结果?假设我有两个 UIImageView
对象,我想要这样的东西:
How can I achieve similar result in Objective-C? Assume I have two UIImageView
objects, I want something like this:
imageView1.mask = imageView2;
如何使用一个 UIImageView
来屏蔽或剪辑另一个的形状?
How can I use one UIImageView
to mask, or clip the shape of, another?
推荐答案
CALayer *maskLayer = [CALayer layer];
UIImage *maskImage = [UIImage imageNamed:@"maskImage.png"];
maskLayer.contents = (id)maskImage.CGImage;
maskLayer.bounds = (CGRect){CGPointZero, maskImage.size};
UIImageView *imageViewToMask = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
imageViewToMask.image = [UIImage imageNamed:@"image2.png"];
imageViewToMask.layer.mask = maskLayer;
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