沿MKPolyLineView（MKPolylineRenderer）的渐变 [英] Gradient along MKPolyLineView ( MKPolylineRenderer )

问题描述

我想根据速度等条件在折线视图上应用渐变。
我能够继承 MKPolyLineRenderer 来绘制自定义笔触和填充，但只沿路径使用相同的颜色。

我看到其他类似的问题，如：

你可以在这里找到演示 https://github.com/wdanxna/GradientPolyline

以及@Templar提供的一些改进提示是：

• 直接在init中准备路径。


• 同时检查CGRectContains，不仅仅是交集。

谢谢你！ ：p

I'd like to apply a gradient on a polyline view depending on some conditions like speed. I was able to subclass MKPolyLineRenderer to draw with custom stroke and fill, but only with the same color along the path.

I saw other similar questions like : Draw segments from a circle or donut or On OSX, how do I gradient fill a path stroke? , but it is not exactly what I'd want. If I understand correctly, a path like below couldn't be filled with these methods. At least not treated as a whole.

A very similar question is Gradient Polyline with MapKit ios. But it adds an overlay for each segment between the points, which I think isn't too efficient.

Is this the only possible way ? ( I'd need to draw hundreds or maybe thousands of these segments ... ) How can this be achieved easily ?

Thanks

解决方案

So the original answer is here https://stackoverflow.com/a/20159374/2606068

you can find the demo here https://github.com/wdanxna/GradientPolyline

and some improvement tips provided by @Templar is:

• prepare the path directly in the init.
• check also for CGRectContains, not only for intersection.

thanks man! :p

这篇关于沿MKPolyLineView（MKPolylineRenderer）的渐变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！