How to mask the layer of a view by the content of another view?

Question

I have a UIImageView and a UILabel, and want the content of the UILabel to mask the UIImageView. The goal is that the text is visible with content of image but everything else transparent.

Is there a simple way to mask a view by the contents of another view?

score 9 · Accepted Answer · edited Jun 20 '20 at 09:12

9

You can use QuartzCore Framework.

(Link project with QuartzCore.framework and import <QuartzCore/QuartzCore.h>).

@import QuartzCore;

Background of label must be clear color. Example:

self.imageView.layer.mask = self.label.layer;
self.imageView.layer.masksToBounds = YES;

In Interface Builder:

enter image description here

On device:

enter image description here

edited Jun 20 '20 at 09:12

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answered Apr 14 '13 at 11:59

Vitaly Berg

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This only works if the content is in monochrome color space doesn't it? – openfrog Apr 14 '13 at 12:15
No, masking use alpha channel of mask layer. – Vitaly Berg Apr 14 '13 at 12:20

How to mask the layer of a view by the content of another view?

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