ios - 将 NSTimeInterval 格式化为 Minutes:Seconds:milliseconds

Question

谁能告诉我如何在这段代码中显示毫秒？

-(void)updateViewForPlayerInfo:(AVAudioPlayer*)p {
    countdownTimer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(updateTimeLeft)userInfo:p repeats:YES];
}

- (void)updateTimeLeft {
    NSTimeInterval timeLeft = player.duration - player.currentTime;

    int min=timeLeft / 60;
    int sec=lroundf(timeLeft) % 60;

    durationLabel.text = [NSString stringWithFormat:@"-%02d:%02d",min,sec,nil];
}

Answer 1

[NSTimer scheduledTimerWithTimeInterval:0.0167 target:self selector:@selector(updateTimer) userInfo:nil repeats:YES];

-(void)updateTimer {
    countDownTotalTimer++;     
    TotalTime.text=[self timeFormatted:countDownTotalTimer];
}

- (NSString *)timeFormatted:(int)milli
{
    int millisec = ((milli) % 60)+39; 
    int sec = (milli / 60) % 60; 
    int min = milli / 3600; 

    return [NSString stringWithFormat:@"%02d:%02d:%02d",min, sec, millisec]; 
}

If any wants milliseconds to max 60 than edit this line

int millisec = ((milli) % 60)+39;  

to

int millisec = ((milli) % 60);

Answer 2

我不明白。您不必为毫秒创建一个新变量吗？

NSInteger milliseconds = (sec * 1000);

durationLabel.text = [NSString stringWithFormat:@"-%02d:%02d.%04d",min,sec, milliseconds, nil];

Answer 3

我认为这是最简单的解决方案：

durationLabel.text = [NSString stringWithFormat:@"-%02d:%06.3f",
    (int)(timeLeft / 60), fmod(timeLeft, 60)];

将时间格式化为MM:SS.sss. 如果你真的想要它MM:SS:sss（我不推荐），你可以这样做：

durationLabel.text = [NSString stringWithFormat:@"-%02d:%02d:%03.0f",
    (int)(timeLeft / 60), (int)fmod(timeLeft, 60), 1000*fmod(timeLeft, 1)];

请注意，stringWithFormat:不需要nil在其参数列表的末尾。