Question

和大多数游戏一样，我以“01:05”格式看到计时器

我正在尝试实现一个计时器，并且在重置时我需要将计时器重置为“00:00”。

此计时器值应位于标签中。

如何创建递增的计时器？比如00：00 --- 00:01 --- 00:02 ..........像dat一样。

建议

问候

Answer 1

我用过的一个简单的方法是：

//In Header
int timeSec = 0;
int timeMin = 0;
NSTimer *timer;

//Call This to Start timer, will tick every second
-(void) StartTimer
{
     timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerTick:) userInfo:nil repeats:YES];
     [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];
}

//Event called every time the NSTimer ticks.
- (void)timerTick:(NSTimer *)timer
{
     timeSec++;
     if (timeSec == 60)
     {
        timeSec = 0;
        timeMin++;
     }
     //Format the string 00:00
     NSString* timeNow = [NSString stringWithFormat:@"%02d:%02d", timeMin, timeSec];
     //Display on your label
     //[timeLabel setStringValue:timeNow];
         timeLabel.text= timeNow;
}

//Call this to stop the timer event(could use as a 'Pause' or 'Reset')
- (void) StopTimer
{
    [timer invalidate];
    timeSec = 0; 
    timeMin = 0;
     //Since we reset here, and timerTick won't update your label again, we need to refresh it again.
     //Format the string in 00:00
     NSString* timeNow = [NSString stringWithFormat:@"%02d:%02d", timeMin, timeSec];
     //Display on your label
// [timeLabel setStringValue:timeNow];
       timeLabel.text= timeNow;
}

Answer 2

这应该给你一个相当准确的计时器，至少是肉眼。这不会刷新视图，只会更新时间和标签：

//call this on reset. Take note that this timers cannot be used as absolutely correct timer like a watch for example. There are some variation.

-(void) StartTimer
{
  self.startTime = [NSDate date] //start dateTime for your timer, ensure that date format is correct
  [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerTick:) userInfo:nil repeats:YES];
 [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];
}


-(void) timerTick
{
    NSTimeInterval timeInterval = fabs([self.startTime timeIntervalSinceNow]); //get the elapsed time and convert from negative value
    int duration = (int)timeInterval; // cast timeInterval to int - note: some precision might be lost
    int minutes = duration / 60; //get the elapsed minutes
    int seconds = duration % 60; //get the elapsed seconds
    NSString *elapsedTime = [NSString stringWithFormat:@"%02d:%02d", minutes, seconds]; //create a string of the elapsed time in xx:xx format for example 01:15 as 1 minute 15 seconds
    self.yourLabel.text = elapsedTime; //set the label with the time
}

Answer 3

创建一个NSDate类型的对象，例如“现在”。之后，请遵循以下代码：

self.now = [NSDate DAte];
long diff = -((long)[self.now timeIntervalSinceNow]);
timrLabel.text = [NSString stringWithFormat:@"%02d:%02d",(diff/60)%60,diff%60];

Answer 4

暂停计时器（基于Hector204答案）：

  \__________^^^^^^^_________/ -------------------- not more than once
                              \_____________/ ----- other conditions

在标签中显示计时器

4 个答案: