我在C++类中创建了一个CFRunLoopTimer,如下所示:

#import <CoreFoundation/CoreFoundation.h>

void cClass::StartTimer()
{
  if(!mActiveSenseTimer)
  {
    CFTimeInterval TIMER_INTERVAL = 5;
    CFRunLoopTimerContext TimerContext = {0, this, NULL, NULL, NULL};
    CFAbsoluteTime FireTime = CFAbsoluteTimeGetCurrent() + TIMER_INTERVAL;
    mTimer = CFRunLoopTimerCreate(kCFAllocatorDefault,
                                  FireTime,
                                  0, 0, 0,
                                  ActiveSenseTimerCallback,
                                  &TimerContext);

    NSLog(@"RunLoop:0x%x, TimerIsValid:%d, TimeIsNow:%f, TimerWillFireAt:%f",
          CFRunLoopGetCurrent(),
          CFRunLoopTimerIsValid(mActiveSenseTimer),
          CFAbsoluteTimeGetCurrent(),
          FireTime);
  }
}

void ActiveSenseTimerCallback(CFRunLoopTimerRef timer, void *info)
{
  NSLog(@"Timeout");
  CFRunLoopTimerContext TimerContext;
  TimerContext.version = 0;

  CFRunLoopTimerGetContext(timer, &TimerContext);
  ((cClass *)TimerContext.info)->Timeout();
}

调用cClass::StartTimer()会导致以下日志输出:



但是,我的计时器永远不会触发。有什么想法吗?

最佳答案

引用docs



另外,请确保您的运行循环不会在计时器触发之前消失。

10-08 06:26