Arepeatingtimerreschedulesitselfbasedonthescheduledfiringtime,nottheactualfiringtime.Forexample,ifatimerisscheduledtofireataparticulartimeandevery5secondsaftert...

调用一次计时器方法：myTimer = [NSTimer scheduledTimerWithTimeInterval:1.5 target:self selector:@selector(scrollTimer) userInfo:nil repe...