任何快速和脏的反锯齿技术旋转UIImageView？ [英] Any quick and dirty anti-aliasing techniques for a rotated UIImageView?

问题描述

我有一个UIImageView（全框和矩形），我用CGAffineTransform旋转。 UIImageView的UIImage填充整个框架。当旋转和绘制图像时，边缘显得明显锯齿状。有什么我可以做，使它看起来更好吗？它显然不是背景消除锯齿。

I've got a UIImageView (full frame and rectangular) that i'm rotating with a CGAffineTransform. The UIImage of the UIImageView fills the entire frame. When the image is rotated and drawn the edges appear noticeably jagged. Is there anything I can do to make it look better? It's clearly not being anti-aliased with the background.

推荐答案

请记住设置适当的反别名选项：

Remember to set the appropriate anti-alias options:

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

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