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我在iOS和macOSX两个平台上用同样的代码测试，查看Runloop的activity switch，发现两个平台的结果不一样，是什么原因.s

代码：

1.创建RunLoop Observer

CFRunLoopObserverContext context = {0,(__bridge void*)self, NULL, NULL, NULL};
_observer = CFRunLoopObserverCreate(kCFAllocatorDefault,
                                          kCFRunLoopAllActivities,
                                          YES,
                                          0,
                                          &runLoopObserverCallBack,
                                          &context);
CFRunLoopAddObserver(CFRunLoopGetMain(), _observer, kCFRunLoopCommonModes);

2.打印活动状态

static void runLoopObserverCallBack(CFRunLoopObserverRef observer, CFRunLoopActivity activity, void *info){
Monitor *monitor = (__bridge Monitor*)info;

switch (activity) {
    case kCFRunLoopEntry:
        NSLog(@"activity_kCFRunLoopEntry");
        break;
    case kCFRunLoopBeforeTimers:
        NSLog(@"activity_kCFRunLoopBeforeTimers");
        break;
    case kCFRunLoopBeforeSources:
        NSLog(@"activity_kCFRunLoopBeforeSources");
        break;
    case kCFRunLoopBeforeWaiting:
        NSLog(@"activity_kCFRunLoopBeforeWaiting");
        break;
    case kCFRunLoopAfterWaiting:
        NSLog(@"activity_kCFRunLoopAfterWaiting");
        break;
    case kCFRunLoopExit:
        NSLog(@"activity_kCFRunLoopExit");
        break;
    default:
        break;
}}

结果：

1.iOS iOS结果

2.macOS MacOS结果

为什么macOS系统中有多个kCFRunLoopEntry？

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0 回答 0