MonoTouch的：圆角UIImage的便捷方法 [英] MonoTouch: Rounded UIImage Convenience Method

问题描述

有一个MonoTouch的内置方法来圆一个的UIImage ？

Is there a MonoTouch built-in method to round the edges of a UIImage ?

我​​似乎记得看到过一次。

I seem to remember seeing it once.

推荐答案

四舍五入一个UIImage会产生另一UIImage的。

Rounding a UIImage would produce another UIImage.

如果您创建一个CGContext上渲染与同样大小的原始图像，您可以做到这一点，然后添加一个剪切路径与圆角和渲染你原来的UIImage。

You can do this if you create a CGContext to render into with the same size as the original image, then add a clipping path with the rounded corners and rendering your original UIImage.

然后就可以拉的UIImage出CGContext上的。

Then you can pull the UIImage out of the CGContext.

另一种选择是避免中间步骤，是推动在上下文绘制图形状态，加上圆润路径作为剪贴路径，绘制图像，然后弹出图形状态回到这一点。

Another option is to avoid the intermediate step, is to push the graphics state in your context drawing, add the rounded path as a clipping path, draw the image and then pop the graphics state to go back to this.

您可以看到TweetStation如何使用这为它的玻璃按钮

You can see how TweetStation uses this for its Glass Buttons:

的 https://github.com/migueldeicaza/MonoTouch.Dialog/blob/master/MonoTouch.Dialog/Utilities/GlassButton.cs#L76

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