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Date
Oct. 30th, 2025
 
2025年十月三十

Post: iOS 入门 008: RunLoop运行循环

iOS 入门 008: RunLoop运行循环

Published 12:04 Apr 09, 2012.

Created by @ezra. Categorized in #Programming, and tagged as #iOS.

Source format: Markdown

Table of Content

RunLoop运行循环

作用与特性

  • 保证程序不退出

  • 监听所有事件，手势触摸、时钟触发、网络加载数据完成

  • 没有事件时回休眠(省电)，一旦监听到事件会会响应

  • 程序启动后会创建RunLoop，每一个线程都有一个RunLoop，但只有主线程的RunLoop会启动

例子

  • 按钮点击事件是如何响应的？

    • addTarget只是注册(给RunLoop)点击按钮后执行控制器的click方法
Application ⬇️
runloop ⬇️
Window ⬇️
ViewController ⬇️
View ⬇️
Button ⬇️
Earlyer Later
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