如何获得NSScrollView尊重剪切路径 [英] How can I get NSScrollView to respect a clipping path

问题描述

我想让一个NSScrollView剪辑的角落，类似于Twitter的应用程序：

I am trying to make a NSScrollView with clipped corners, similar to the Twitter app:

我有一个 NSScrollView 添加了以下代码：

I have a NSScrollView subclass which I added the following code:

- (void)drawRect:(NSRect)dirtyRect {
    NSBezierPath *pcath = [NSBezierPath bezierPathWithRoundedRect:[self bounds] xRadius:kDefaultCornerRadius yRadius:kDefaultCornerRadius];
    [path setClip];

    [super drawRect:dirtyRect];
}

我希望 NSScrollView 有圆角，但它不尊重剪裁的路径。我如何做到这一点？

I expected the content of the NSScrollView to have rounded corners, but it is not respecting the clipped path. How can I do this?

UPDATE&澄清

我知道如何制作一个自定义的 NSScroller ，我知道如何使其透明覆盖。我要求的是如何使 NSSCrollView 剪辑它的角落，包括它包含的一切。 NSScrollView 在一个 NSView 里面，它有一个可以改变的背景，这意味着一个视图覆盖来伪造圆角是

UPDATE & CLARIFICATION
I know how to make a custom NSScroller, I know how to make it transparent overlay. All I am asking is how to make the NSSCrollView clip its corners, including everything it contains. The NSScrollView is inside a NSView which has a background that could change, meaning a view overlay to fake the rounded corners is not an option.

推荐答案

您可以对视图的图层应用遮罩：

You can apply a mask to a view's layer:

[myScrollView setWantsLayer: YES];
[myScrollView layer].mask = ...;

掩码是另一个 CALayer 。因此，在这种情况下，您将创建一个 CALayer ，将其背景颜色设置为不透明，设置其边界以匹配scrollview，并给它一个 cornerRadius $

The mask is another CALayer. So in this case you'd create a CALayer, set its background colour to opaque, set its bounds to match the scrollview, and give it a cornerRadius of, say, 8.0.

结果将是滚动视图和它的所有内容将被掩盖为一个圆角半径为8px的圆角。

The result would be that the scroll view and all its contents would appear to be masked to a roundrect with a corner radius of 8px.

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