如何暂停/播放NSTimer？

Question

我需要以0:0:0的方式启动NSTimer我正在做的并且我点击了一个暂停按钮,如果用户点击播放,定时器必须暂停一段时间,它必须从暂停的时间值运行.如何暂停和玩NSTimer？有帮助吗？提前致谢.

Answer 1

尝试这个shizzle ...对我很有用

编辑

说实话,我的实际代码是这样的:

-(IBAction)clicked:(id)sender
{
    if ([startStop.titleLabel.text isEqualToString:@"Start"]) 
    {
        [startStop setTitle:@"Pause" forState:UIControlStateNormal];
        [startStop setTitleColor:[UIColor redColor] forState:UIControlStateNormal];

        timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(countUp) userInfo:nil repeats:YES];
        timerDown = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(countDown) userInfo:nil repeats:YES];

    } else if ([startStop.titleLabel.text isEqualToString:@"Pause"])
    {
        [startStop setTitle:@"Resume" forState:UIControlStateNormal];
        [startStop setTitleColor:[UIColor colorWithRed:0/255 green:0/255 blue:255/255 alpha:1.0] forState:UIControlStateNormal];

        pauseStart = [[NSDate dateWithTimeIntervalSinceNow:0] retain];
        previousFireDate = [[timer fireDate] retain];
        [timer setFireDate:[NSDate distantFuture]];

    } else if ([startStop.titleLabel.text isEqualToString:@"Resume"])
    {
        [startStop setTitle:@"Pause" forState:UIControlStateNormal];
        [startStop setTitleColor:[UIColor redColor] forState:UIControlStateNormal];

        float pauseTime = -1*[pauseStart timeIntervalSinceNow];
        [timer setFireDate:[NSDate dateWithTimeInterval:pauseTime sinceDate:previousFireDate]];
        [pauseStart release];
        [previousFireDate release];
    }
}

我使用了UIButton并在点击时使用了这段代码.

记得把这个:

NSDate *pauseStart, *previousFireDate;

在你的.h文件中

编辑!

这是countUp方法.忘记了down方法.是几分钟,几分钟,几小时

- (void)countUp
{
    seconds += 1;

    if (seconds == 60) 
    {
        seconds = 0;
        minutes++;

        if (minutes == 60) 
        {
            minutes = 0;
            hours++;
        }
    }

}

Answer 2

你没有.而不是暂停只是使无效并释放旧计时器,当用户再次按下播放时,创建一个新的计时器.