kCFRunLoopEntry = (1UL << 0), RunLoop开始
kCFRunLoopBeforeTimers = (1UL << 1), RunLoop即将处理Timer
kCFRunLoopBeforeSources = (1UL << 2), RunLoop即将处理Source
kCFRunLoopBeforeWaiting = (1UL << 5), RunLoop即将进入休眠状态
kCFRunLoopAfterWaiting = (1UL << 6), RunLoop即将从休眠状态被事件唤醒
kCFRunLoopExit = (1UL << 7), RunLoop退出
kCFRunLoopAllActivities = 0x0FFFFFFFU
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