如何屏蔽 UIScrollView? [英] How to mask a UIScrollView?

问题描述

我目前有一个图像遮罩，我想用它来遮罩 UIScrollView.滚动视图包含 1 个 UIImageView.

I currently have an image mask I want to use to mask a UIScrollView. The scrollview holds 1 UIImageView.

这是我目前在 viewdidload 中所做的:

Here is what I do at the moment in viewdidload:

CALayer *mask = [CALayer layer];
mask.contents = (id)[UIImage imageNamed:@"ScrollMask.png"].CGImage;
mask.frame = CGRectMake(0, 0, 512, 384);
[Scroll1.layer setMask:mask]; 

这在某种程度上有效.它掩盖了滚动视图内的 ImageView，但不掩盖滚动视图本身.

This works to some degree. It masks the ImageView inside the scrollview but not the scrollview itself.

有没有办法屏蔽滚动视图的 CALayer 而不是 imageview 的层?

Is there a way to mask the scrollview's CALayer and not imageview's layer?

推荐答案

你应该把 UIScrollView 放到 UIView 中，然后将 mask 应用到 UIView 而不是 UIScrollView.

You should put the UIScrollView into a UIView, and then apply the mask to the UIView instead of the UIScrollView.

CALayer *mask = [CALayer layer];
mask.contents = (id)[UIImage imageNamed:@"ScrollMask.png"].CGImage;
mask.frame = CGRectMake(0, 0, 512, 384);

UIView *containerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 512, 384)];
[containerView.layer setMask:mask];

[containerView addSubview:Scroll1];
[self.view addSubview:containerView];

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