iPhone - 将视角应用于CALayer时的锯齿状边缘 [英] iPhone - Jagged Edges when applying perspective to CALayer

问题描述

我有一个CALayer，我应用透视图来使用 CGTransform3D 并指定 m14 属性。应用透视时，图层具有锯齿状边缘。我听说有人提到在图层周围添加1px透明边框会有助于此。我不知道该怎么做。我已尝试使用CALayer的 border 和 borderWidth 属性，但锯齿状边缘仍然存在。我也试图减少所有方面1px绘制的矩形，但它也没有帮助。

任何帮助都会很棒！谢谢！

解决方案

通过我听过人们提到，我认为你的意思是关于这个问题。建议实际绘制CALayer中的内容，使其在核心内容之外有一个像素透明边框，使用代码

  CGContextSetAllowsAntialiasing（theContext，true）; 
 CGContextSetShouldAntialias（theContext，true）; 
  

在该图层的Quartz图形中。

<在CALayer上还有 edgeAntialiasingMask 属性，但在使用如下代码时我没有看到任何影响：

  layer.edgeAntialiasingMask = kCALayerLeftEdge | kCALayerRightEdge | kCALayerBottomEdge | kCALayerTopEdge; 
  

关于变换图层边缘的抗锯齿。另请参阅此问题，以便对此进行讨论，以及它们如何使用图像周围的单像素透明边框解决了他们的问题。

I have a CALayer that I apply a perspective to using a CGTransform3D and specifying the m14 property. When the perspective is applied, the layer has jagged edges. I've heard people mention that adding a 1px transparent border around the layer will help with this. I don't know how to do that. I have tried using the border and borderWidth properties of a CALayer but the jagged edges are still there. I also tried to reduce the rect that is drawn by 1px on all sides, but it doesn't help either.

Any help would be great! Thanks!

解决方案

By "I've heard people mention," I assume you mean the discussion on this question. What was suggested there was to actually draw the content in your CALayer so that it has a one-pixel transparent border outside of the core content, using the code

CGContextSetAllowsAntialiasing(theContext, true);
CGContextSetShouldAntialias(theContext, true);

within your Quartz drawing for that layer.

There's also the edgeAntialiasingMask property on CALayer, but I've seen no impact when using code like the following:

layer.edgeAntialiasingMask = kCALayerLeftEdge | kCALayerRightEdge | kCALayerBottomEdge | kCALayerTopEdge;

on the antialiasing of transformed layer edges. See also this question for discussion of this, as well as how they solved their problem using one-pixel transparent borders around their images.

这篇关于iPhone - 将视角应用于CALayer时的锯齿状边缘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！