Geek asks and answers

AVAudioPlayer - display the countdown timer on UILabel

I have a countdown timer that displays the number of seconds remaining on the audio track. For some reason, the countdown is not calculated at intervals of 1 second, but 2 seconds on the first count, and then 1 second on the next count. (He counts in this pattern - he jumps 2 seconds, then 1 again and again).

here is my code:

// display current time left on the track
- (void)updateTimeLeft {
    NSTimeInterval timeLeft = self.player.duration - self.player.currentTime;

    // update your UI with timeLeft
    self.timeDisplay.text = [NSString stringWithFormat:@"%.2f", timeLeft / 60];

}

and here is my NSTimer:

NSTimer * myTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateTimeLeft) userInfo:nil repeats:YES];

Thanks for any help.

+3
source share
3 answers

try it

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

int min=timeLeft/60;

int sec = lroundf(timeLeft) % 60;

// update your UI with timeLeft
self. timeDisplay.text = [NSString stringWithFormat:@"%d minutes %d seconds", min,sec];
}

just an idea

+7
source 
 - (void)updateTimeLeft
 {
NSTimeInterval timeLeft = self.player.duration - self.player.currentTime;

// update your UI with timeLeft
self. timeDisplay.text = [NSString stringWithFormat:@"%f seconds left", timeLeft];
}

try this ... it will only be displayed in seconds

+1
source

The best way to use the formate system:

    - (NSString*)updateTimeLeft
    {
        float current = CMTimeGetSeconds(_player.currentItem.currentTime);
        float duration = CMTimeGetSeconds(_player.currentItem.duration);

        if(!isnan(current) && !isnan(duration)){
             NSTimeInterval timeLeft = duration - current;    
             NSTimeInterval durationInSeconds = timeLeft;
             NSDateComponentsFormatter *formatter = [[NSDateComponentsFormatter alloc] init];
             formatter.allowedUnits = NSCalendarUnitMinute | NSCalendarUnitSecond;
             formatter.zeroFormattingBehavior = NSDateComponentsFormatterZeroFormattingBehaviorPad;
             NSString *string = [formatter stringFromTimeInterval:durationInSeconds];

             return string;
         }

     return nil;
    }
0
source

More articles:


All Articles