如何判断引起drawRect的原因是什么？ [英] How to tell what's causing drawRect to be called?

问题描述

我有一些自定义NSView，其中包含一些自定义按钮，这些按钮被添加为NSView的drawRect方法中的子视图。

I've got my custom NSView with a bunch of custom buttons in it, the buttons are added as a subView in the NSView's drawRect method.

现在我发现按下按钮后，父视图的drawRect被重复调用。有时候，当我退出应用程序时，它只会停止 - 我从drawRect中的一个简单的日志语句中知道这一点。

Now I'm finding that after pressing a button the drawRect of the parent view is repeatedly called. Sometimes it only stops when I quit the app - I know this from a simple log statement in drawRect.

现在我知道我的应用程序中可能有更大的体系结构问题导致，我去哪里开始跟踪导致这个视图被重复重绘的原因？

Now I know there are probably bigger architectural issues in my app causing this, where do I go to begin tracking down what's causing this view to be repeatedly redrawn?

谢谢！

推荐答案

首先，您不应该在 drawRect中添加子视图：。

您是在做任何自定义绘图还是只是添加子视图？如果你没有做任何绘图，你不应该实现 drawRect：。

Are you doing any custom drawing or are you just adding subviews? If you're not doing any drawing, you should not implement drawRect:.

你想添加子视图在 initWithFrame：中，然后您要根据在 layoutSubviews 中设置子视图的框架

You want to add the subviews in initWithFrame: and then you want to set the frames of the subviews in layoutSubviews based on self.bounds.

如果您有任何问题，请随时问。

If you have any questions, feel free to ask.

编辑：只是意识到你在问NSView而不是UIView。我从来没有使用NSView，但也许他们的工作类似。

Just realized that you were asking about NSView and not UIView. I've never used NSView, but perhaps they work similarly.

编辑2：我读了一些关于NSView，它似乎不要有 layoutSubviews 。也许您应该将框架设置为 drawRect：？我还是很确定你不想在 drawRect中添加子视图：。

EDIT 2: I read a bit about NSView and it doesn't seem to have layoutSubviews. Perhaps you should set the frames in drawRect:? I'm still pretty sure you don't want to add subviews in drawRect:.

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