当我使用transform属性旋转UIImageView时，边缘会像素化 [英] When I rotate an UIImageView with the transform property, the edges pixellate

问题描述

可能重复：

如何在旋转视图上进行抗锯齿处理？

我正在尝试使用这种技术旋转一些UIImageViews：

I'm trying to rotate some UIImageViews using this technique:

imageView.transform = CGAffineTransformMakeRotation(r);

其中r是一个通常介于-0.3和0.3之间的浮点数。

where r is a float usually between -0.3 and 0.3.

问题在于旋转的图像（来自方形jpegs）具有锯齿状边缘（像素化），因为它们在变换后处于一个角度。有没有办法解决这个问题，使边缘平滑（即抗锯齿）？

The problem is that the images (which are derived from square jpegs) that are rotated have jagged edges (pixellation), because they are at an angle after the transform. Is there a way to fix this so the edges are smooth (i.e. antialiased)?

推荐答案

您可以在Info.plist中设置一个启用边缘抗锯齿的键：UIViewEdgeAntialiasing。

There is a key that you can set in Info.plist that enables antialiasing of the edges: UIViewEdgeAntialiasing.

http：// developer.apple.com/library/ios/#documentation/general/Reference/InfoPlistKeyReference/Articles/iPhoneOSKeys.html

这篇关于当我使用transform属性旋转UIImageView时，边缘会像素化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！