I want to mimic the UIScrollView behavior where the current thread RunLoop mode changes to UITrackingRunLoopMode when you drag the scrollView, and back to NSDefaultRunLoopMode when you stop dragging. I want to mimic the UIScrollView behavior where
阅读背景：
将当前线程NSRunLoop设置为以某种模式运行的正确方法是什么，直到我决定停止它为止？
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