maskToBounds和cornerRadius之间的关系是什么？ [英] what is relation between masksToBounds and cornerRadius?

问题描述

我的滚动条有一些视图 cornerRadius = 10.0 和 masksToBounds = YES 。

My scroll has some views that is cornerRadius = 10.0 and masksToBounds = YES.

这会导致滚动滚动视图时出现性能问题。虽然我尝试了每个视图的 shouldRasterize 设置为 YES ，但问题仍未解决。

This causes a performance issue for scrolling my scroll view. Though I tried each view's shouldRasterize is set YES, the issue is not solved.

但是，我知道这个问题的解决方案。这就是 masksToBound 设置否。 （ masksToBound的默认值为NO）
虽然 masksToBound 是否，我的观点的角落仍然有曲线，性能问题也解决了。

However, I know the solution for this issue. That is what masksToBound is set NO. (masksToBound's default value is NO) Although masksToBound is NO, my views's corners still have curve and the performance issue is solved, too.

我想知道 cornerRadius <之间的关系/ code>和 masksToBounds 。我担心此设置会出现意外问题。

I want to know about relation between cornerRadius and masksToBounds. I'm afraid of unexpected issues with this setting.

谢谢。

推荐答案

提供 cornerRadius 后，指定用于绘制接收者背景圆角的半径。

After providing cornerRadius which specifies a radius used to draw the rounded corners of the receiver’s background.

现在它依赖于 masksToBounds ，它确定子层是否被剪切到接收器的边界。因此，如果将其设置为 YES ，则会将与图层边界匹配的隐式遮罩应用于图层，包括 cornerRadius 财产。如果设置为 YES 并指定了mask属性，则将两个掩码相乘以获得实际的掩码值。

Now it depends on masksToBounds which determines if the sublayers are clipped to the receiver’s bounds. So if it is set to YES, an implicit mask matching the layer bounds is applied to the layer, including the effects of the cornerRadius property. If it is set to YES and a mask property is specified, the two masks are multiplied to get the actual mask values.

例如：

如果您在带有图像内容的 CALayer 上设置该图像，图像仍然是在角半径边界外绘制。您可以通过将 sublayer.masksToBounds 设置为 YES 来解决此问题;但如果你这样做，阴影就不会出现，因为它们会被掩盖掉！

If you set that on a CALayer with image contents, the image will still be drawn outside the corner radius boundary. You can solve this by setting sublayer.masksToBounds to YES; but if you do that, the shadows won’t show up because they’ll be masked out!

这篇关于maskToBounds和cornerRadius之间的关系是什么？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！