runloop 多线程

好文章链接:https://www.jianshu.com/p/b9426458fcf6 // Runloop 负责1. 监听 2.保证程序不退出 //currentRunLoop 当前线程的 RunLoop NSTime * timer = [NSTimer timerWithTimeInterval:1.0 target:self selector:@selector(timerMethod)

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