如何使用Core Graphics / Quartz 2D在iOS中制作圆锥形渐变？ [英] How to make a conical gradient in iOS using Core Graphics / Quartz 2D?

问题描述

如何使用Core Graphics / Quartz 2D API在iOS中绘制这样的锥形渐变？

How can I draw such a conical gradient in iOS using Core Graphics / Quartz 2D API?

Conical Gradient Sample http://ods.com.ua/win/eng/other/gimpdoc-html/painta27.gif

推荐答案

这种渐变风格没有Quartz函数。除非你准备深入研究它背后的数学，否则我建议你使用预先制作的图像。如果你只需要它用于不透明蒙版，这不是问题。

There is no Quartz function for this style of gradient. Unless you're ready to dig into mathematics behind it, I'd suggest you use pre-made images for this. It's not a problem if you need it only for opacity mask.

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