模糊CALayer的上层 [英] Blur CALayer's Superlayer

问题描述

我有一个CALayer和一个子图层。我想实现的是超级模糊（子层下面的区域），就像标准的工作表一样。我试图在子图层上设置 .compositingFilter ，但这似乎不起作用。

I've got a CALayer and a sublayer in it. What i want to achieve is a blur of the superlayer (the area under the sublayer), just like the standard sheets do it. I've tried to set a .compositingFilter on the sublayer but this doesn't seem to work.

任何想法如何解决这个问题？

Any ideas how to solve this?

子层中的代码init：

Code from the sublayers init:

CIFilter *blur = [CIFilter filterWithName:@"CIGaussianBlur"];
[blur setDefaults];     
self.layer.backgroundFilters = [NSArray arrayWithObject:blur];

推荐答案

上述应该工作正常，用于包含图像的简单超图层，以下适用于我：

The above should work fine, depending on the context it is used in. E.g. with a simple super-layer containing an image, the following works for me:

CALayer *blurLayer = [CALayer layer];
CIFilter *blur = [CIFilter filterWithName:@"CIGaussianBlur"];
[blur setDefaults];     
blurLayer.backgroundFilters = [NSArray arrayWithObject:blur];    
[superLayer addSublayer:blurLayer];

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