ios - 定时器 3 :30 mins which has a options with add and skip?

Question

我是 ios 的新手，所以我需要帮助制作一个 3:30 分钟的计时器，它有两个选项，添加和跳过，在计时器到达 00:00 后会消失。请帮助我，我现在处于非常困难的境地。

这是定时器

-(void)updatelable:(NSTimer *)timer {

    remainingTime=180;

    for (int i=remainingTime;i==0 ;i--) {

        NSInteger minutes = floor(*(remainingTime))/ 60;
        remainingTime = remainingTime-(minutes*60);

        NSInteger seconds = remainingTime;

        second.text =[NSString stringWithFormat:@"%02ld",seconds];
        minute.text =[NSString stringWithFormat:@"%02ld",minutes];

        timerLabel.text = @"Time up!!";
    }

    [timer invalidate];
}

Answer 1

这不是最复杂的方法，但它确实适合您，并且它准确地展示了这种方法在实践中应该如何工作:

static NSInteger remainingTime = 210;

// ...

- (void)startTimer {
    [[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(counter:) userInfo:nil repeats:TRUE] fire];
}

- (void)counter:(NSTimer *)timer {
    remainingTime--;

    NSLog(@"%02ld:%02ld", (NSInteger)(remainingTime / 60.0), (remainingTime % 60));

    if (remainingTime == 0) {
        // times up!
       [timer invalidate];
    }
}