如何向UIView添加径向渐变？ [英] How do I add a radial gradient to a UIView?
问题描述
我有一个 UIView 我想要一个径向渐变，我想知道如何去做这个？
I have a UIView which I want to have a radial gradient, and I'm wondering how to go about doing this?
推荐答案
要执行此操作，您需要下载到Core Graphics并使用 CGContextDrawRadialGradient 。
To do this you need to drop down to Core Graphics and use CGContextDrawRadialGradient.
类似Stack Overflow问题
How to draw a gradient line (fading in/out) with Core Graphics/iPhone?
其他资源
有一个教程展示如何绘制图标iOS上的渐变：
There's a tutorial showing how to draw icons with gradients on iOS here:
http://redartisan.com/2011/05/13/porting-iconapp-core-graphics
他把代码放在Github上，完成了一个UIView子类，它显示了使用Core Graphics制作渐变的（相当漫长的）方式：
He's put the code on Github, complete with a UIView subclass that shows the (rather longwinded) way of making gradients using Core Graphics:
https://github.com/crafterm/IconApp/blob/master/IconApp/IconView.m
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