应用程序冻结，但CPU使用率随时间增加

@ Paulw11的评论有所帮助-与系统跟踪工具相比，Time Profiler模板更适合此任务。

I used the Time Profiler and got led to a bunch of traces that point to the UINavigationBar as the suspect repetitive caller to my custom UIControl's layoutSubviews. To further explain my view hierarchy:

• My "Home" view controller has a custom title view in its UINavigationItem
• The custom title view is a custom UIControl that launches a modal when tapped

Here's the deal: If I alloc-initWithFrame my custom UIControl with a frame of CGRectZero, the app freezes. If I provide a garbage initial value to the frame (which is disregarded anyway since UINavigationBar reshapes my custom UIControl) like CGRectMake(0, 0, 10, 10), the crash doesn't happen.

我猜想UINavigationBar对如何布局初始帧为的自定义标题视图感到困惑(0, 0, 0, 0)。听起来像是苹果的虫子。

注意：我在iOS 8.2上运行。