iPhone - setNeedsDisplay 不调用drawRect
我看过很多关于这个问题的帖子，但没有得到答案。我有一个控制器，它将视图添加到主窗口。控制器的视图有一个子视图，该子视图有一个drawRect。问题是，即使我调用 [self setNeedsDisplay]，这个函数也永远不会被调用。
谢谢
I have seen many posts about this problem but didn't get an answer. I have a controller which view is added to the main window. The controller's view has a subview which has a drawRect. The problem is that this function is never called even if I call [self setNeedsDisplay].
Thanks
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它是
-(void)drawRect:(CGRect)rect对吧？确保方法签名正确，并且即使不使用rect参数，也不要省略它。-setNeedsDisplay应该被称为子视图，而不是self。另外，
-setNeedsDisplay不会立即调用-drawRect:。它仅刷新图形缓存，以便在下一次更新帧时强制调用-drawRect:。It is
-(void)drawRect:(CGRect)rectright? Make sure the method signature is correct, and you don't omit therectargument even if you don't use it.-setNeedsDisplayshould be called the the subview, notself.Also,
-setNeedsDisplaywon't call-drawRect:immediately. It only flushes the graphics cache so that-drawRect:is forced to be called in the next update of the frame.