iphone - NSTimer : How to change the scheduled method without having delay?

Question

在我的 iPhone TIMER 应用程序中，

经过一段时间后，我需要更改预定的方法......

-(void)startTimerAction
{
    NSLog(@"Start timer Action");
    NSLog(@"Time is Over %@",isTimeOver?@"YES":@"NO");

    if(!isTimeOver)
    {
    timer_main = [NSTimer scheduledTimerWithTimeInterval:(1.0) target:self selector:@selector(ShowActicity) userInfo:nil repeats:YES];
    }
    else if(isTimeOver)
    {
    timer_main = [NSTimer scheduledTimerWithTimeInterval:(1.0) target:self selector:@selector(continueClock) userInfo:nil repeats:YES];    
    }

}

所以，为了停止并重新安排它，我正在这样做......以某种方式......

isTimeOver=YES;
               [timer_main invalidate];
               timer_main=nil;
               [self startTimerAction];

为此，需要一些时间延迟或不需要的间隔才能在新方法中重新安排计时器....

怎样才能顺利完成......

我只是想用另一种方法重新安排计时器而不造成延迟......

现在我正在这样做来修复它......

      NSTimeInterval x=[[timer_main fireDate] timeIntervalSinceNow];
       [timer_main invalidate];
       timer_main=nil;
       sleep(x);   
       totalCount++; 
       seconds++;
       if(seconds>59)
       {
           minutes++;
           seconds=0;
       }

       [self startTimerAction];

谢谢...

Answer 1

您可以schedule repeating timers with a firedate :

NSTimer *timer = [[NSTimer alloc] initWithFireDate:fireDate
                                  interval:interval
                                  target:self
                                  selector:@selector(foo)
                                  userInfo:nil
                                  repeats:YES];
NSRunLoop *runLoop = [NSRunLoop currentRunLoop];
[runLoop addTimer:timer forMode:NSDefaultRunLoopMode];