We can have many handlers: touches handler, UIControl handler (buttons, sliders), performSelector, CADisplayLink, NSTimer events, Gesture Recognizer, accelerometer handler, and We can have many handlers: touches handler, UIC
阅读背景：
iOS应用中的所有方法通常都在一个线程中吗？ （用于预防竞赛条件）
来源：互联网
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