NSTimer 倒计时跳过最后一秒（不使用最后毫秒）答案

【问题标题】：NSTimer countdown skips last second (not using last milliseconds)NSTimer 倒计时跳过最后一秒（不使用最后毫秒）
【发布时间】：2013-09-27 19:39:21
【问题描述】：

感谢您的回答，我有一个 NS 计时器倒计时，它工作得非常好。但是，我的计时器跳过了最后一秒，因此它不计算最后的 0s:99 ms 。我的代码有什么问题吗？最好的问候！

-(void) setTimer {
    MySingletonCenter *tmp = [MySingletonCenter sharedSingleton];
    tmp.milisecondsCount = 99;
    tmp.secondsCount = 2;



    tmp.countdownTimerGame = [NSTimer scheduledTimerWithTimeInterval:.01 target:self selector:@selector(timerRun) userInfo:nil repeats:YES];


}

-(void) timerRun {
    MySingletonCenter *tmp = [MySingletonCenter sharedSingleton];
    tmp.milisecondsCount = tmp.milisecondsCount - 1;



    if(tmp.milisecondsCount == 0){
        tmp.secondsCount -= 1;


        if (tmp.secondsCount == 0){

            //Stuff for when the timer reaches 0

            [tmp.countdownTimerGame invalidate];
            tmp.countdownTimerGame = nil;
            tmp.lives = tmp.lives - 1;
            NSString *newLivesOutput = [NSString stringWithFormat:@"%d", tmp.lives];
            livesLabel.text = newLivesOutput;
            if (tmp.lives == 0) {
                timeLabel.text = @"0:00";
                [self performSelector:@selector(stopped) withObject:nil afterDelay:2.0];

            }
            else {[self setTimer]; }
        }
        else

            tmp.milisecondsCount = 99;
    }


    NSString *timerOutput = [NSString stringWithFormat:@"%2d:%2d", tmp.secondsCount, tmp.milisecondsCount];

    timeLabel.text = timerOutput;






}

【问题讨论】：

标签： iphone ios xcode nstimer countdown

【解决方案1】：

尝试改变这一点

-(void) setTimer {
    MySingletonCenter *tmp = [MySingletonCenter sharedSingleton];
    tmp.milisecondsCount = 100;// Change this from 99 to 100
    tmp.secondsCount = 2;



    tmp.countdownTimerGame = [NSTimer scheduledTimerWithTimeInterval:.01 target:self selector:@selector(timerRun) userInfo:nil repeats:YES];


}

【讨论】：

我已经试过了。但它不起作用。无论如何感谢您的回答。

【解决方案2】：

首先，摆脱

else {[self setTimer]; }

否则，每次选择器触发时，您都会重新启动计时器。

下一步：交换这两个

    tmp.secondsCount -= 1;

    if (tmp.secondsCount == 0){

到

else {
    tmp.secondsCount -= 1;
    tmp.milisecondsCount = 99;
}

像这样：

-(void) timerRun {
    MySingletonCenter *tmp = [MySingletonCenter sharedSingleton];
    tmp.milisecondsCount = tmp.milisecondsCount - 1;

    if(tmp.milisecondsCount == 0){

        if (tmp.secondsCount == 0){

            //Stuff for when the timer reaches 0

            [tmp.countdownTimerGame invalidate];
            tmp.countdownTimerGame = nil;
            tmp.lives = tmp.lives - 1;
            NSString *newLivesOutput = [NSString stringWithFormat:@"%d", tmp.lives];
            livesLabel.text = newLivesOutput;
            if (tmp.lives == 0) {
                timeLabel.text = @"0:00";
                [self performSelector:@selector(stopped) withObject:nil afterDelay:2.0];

            }
        }
        else
        {
            tmp.milisecondsCount = 99;
            tmp.secondsCount -= 1;
        }
    }

    NSString *timerOutput = [NSString stringWithFormat:@"%2d:%2d", tmp.secondsCount, tmp.milisecondsCount];

    timeLabel.text = timerOutput;

}

【讨论】：