我需要在核心图中设置主机视图的背景颜色, 以清除颜色 。 有人能帮我吗?
核心绘图主机视图是 UIView 的子类。 它应该默认为明确的 begroundColor 。 见 UIView docs 。
您也可以使用您的图像在图形上设置一个填充,而不是将其放在背景中。
graph.fill = [CPTFill fillWithImage:[CPTImage imageWithCGImage:myCGImage]];
这只是一个例子。 CPTimage 还有其他几种初始化方法。
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