Visualizzare una barra di scorrimento con la posizione corrente del tempo di riproduzione

È possibile visualizzare il tempo corrente e rimanente del contenuto in fase di riproduzione.

Per implementare una barra di scorrimento, utilizza il seguente codice di esempio:

// 1. Register for the PTMediaPlayerTimeChangeNotification
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(onMediaPlayerTimeChange:)
  name:PTMediaPlayerTimeChangeNotification object:self.player];

...

_positionSlider = [[UISlider alloc] initWithFrame:CGRectMake(105.0, 14.0, 370, 24)];
[_positionSlider addTarget:self action:@selector(sliderThumbReleased:)
  forControlEvents:UIControlEventTouchUpInside];

...

// 2. Cover the event where the user moves to a different location in the stream
- (void)sliderThumbReleased:(id)sender {
    double  sliderTime = [_positionSlider  value];
    CMTimeRange seekableRange = self.player.seekableRange;
    if (CMTIMERANGE_IS_VALID(seekableRange)) {
        double start = CMTimeGetSeconds(seekableRange.start);
        double duration = CMTimeGetSeconds(seekableRange.duration);

        CMTime newTime = CMTimeMakeWithSeconds((sliderTime * duration) + start, AD_TIMESCALE);
        [self.player seekToTime:newTime];
    }
}

...

// 3. This method is called whenever the player time changes
(PTMediaPlayerTimeChangeNotification)
- (void) onMediaPlayerTimeChange:(NSNotification *)notification {
    CMTimeRange seekableRange = self.player.seekableRange;

    if (CMTIMERANGE_IS_VALID(seekableRange)) {
        double start = CMTimeGetSeconds(seekableRange.start);
        double duration = CMTimeGetSeconds(seekableRange.duration);
        double currentTime = CMTimeGetSeconds(self.player.currentItem.currentTime);

        if (duration > 0) {
            //Set the position slider value on the current playback time
            [_positionSlider setValue:((currentTime - start) / duration)];
        }
    }
}

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