iPhone Subview Transparent

Question

I subclassed a subview and added it to the current view. It draws a simple circle by overriding the draw method.

But the subview has a black background it looks like by default. How do I make the background of my subclassed subview to be transparent?

Answer 1

does

self.backgroundColor = [UIColor clearColor] not work?

Answer 2

您可以调用下一个代码进入视图初始化：

self.backgroundColor = [UIColor clearColor];