如何将UISlider添加到AVPlayer

Question

我想将uislider添加到我的播放器中,这样我就可以在AVPlayer中播放音频时实现擦洗.一旦第一首歌曲播出,uislider将返回原始位置,下一首歌曲将开始播放.如果有人帮助我,我会很感激.这是我的代码.

-(IBAction)goToiPodLibrary:(UIButton *)sender
{

    // Create picker view
    MPMediaPickerController* picker = [[MPMediaPickerController alloc] init];
    picker.delegate = self;

    if (userMediaItemCollection) {

        MusicTableViewController *controller = [[MusicTableViewController alloc] initWithNibName: @"MusicTableView" bundle: nil];
        controller.delegate = self;

        controller.modalTransitionStyle = UIModalTransitionStyleCoverVertical;

        [self presentModalViewController: controller animated: YES];

        // else, if no music is chosen yet, display the media item picker
    } else {

        MPMediaPickerController *picker =
        [[MPMediaPickerController alloc] initWithMediaTypes: MPMediaTypeMusic];

        picker.delegate                     = self;
        picker.allowsPickingMultipleItems   = YES;
        picker.prompt                       = NSLocalizedString (@"Add songs to play", "Prompt in media item picker");

        // The media item picker uses the default UI style, so it needs a default-style
        //      status bar to match it visually
        [[UIApplication sharedApplication] setStatusBarStyle: UIStatusBarStyleDefault animated: YES];

        [self presentModalViewController: picker animated: YES];
    }

}



-(IBAction)playButtonPressed:(UIButton *)sender
{
    [myPlayer play];
}


-(IBAction)pauseButtonPressed:(UIButton *)sender
{
    [myPlayer pause];
}


-(void) mediaPickerDidCancel:(MPMediaPickerController *)mediaPicker {

    // Dismiss selection view
    [self dismissViewControllerAnimated:YES completion:nil];

}

-(void) mediaPicker:(MPMediaPickerController *)mediaPicker didPickMediaItems:(MPMediaItemCollection *)mediaItemCollection {

    // Dismiss selection view
    [self dismissViewControllerAnimated:YES completion:nil];

    // Get AVAsset
    NSURL* assetUrl = [mediaItemCollection.representativeItem valueForProperty:MPMediaItemPropertyAssetURL];
    AVURLAsset* asset = [AVURLAsset URLAssetWithURL:assetUrl options:nil];

    // Create player item
    AVPlayerItem* playerItem = [AVPlayerItem playerItemWithAsset:asset];



    // Play it
    myPlayer = [AVPlayer playerWithPlayerItem:playerItem];

    [playlistSongsArray addObjectsFromArray:mediaItemCollection.items];

    NSLog(@" Playlist songs  %@",playlistSongsArray);

    [self.myPlaylistTable reloadData];

    [myPlayer play];

}

Answer 1

- (void)sliderValueChanged:(id)sender {
    CMTime newTime = CMTimeMakeWithSeconds(timeSlider.value * durationSeconds, player.currentTime.timescale);
    [self.player seekToTime:newTime];
}

使用UISlider(这里称为timeSlider)和上面的方法

这是在播放时更新滑块的方法:

self.playbackObserver = [player addPeriodicTimeObserverForInterval:interval queue:NULL usingBlock:^(CMTime time) {
    CMTime endTime = CMTimeConvertScale (player.currentItem.asset.duration, player.currentTime.timescale, kCMTimeRoundingMethod_RoundHalfAwayFromZero);
    if (CMTimeCompare(endTime, kCMTimeZero) != 0) {
        double normalizedTime = (double) player.currentTime.value / (double) endTime.value;
        self.timeSlider.value = normalizedTime;
    }
    Float64 currentSeconds = CMTimeGetSeconds(player.currentTime);
    int mins = currentSeconds/60.0;
    int secs = fmodf(currentSeconds, 60.0);
    NSString *minsString = mins < 10 ? [NSString stringWithFormat:@"0%d", mins] :      [NSString stringWithFormat:@"%d", mins];
    NSString *secsString = secs < 10 ? [NSString stringWithFormat:@"0%d", secs] : [NSString stringWithFormat:@"%d", secs];
    currentTimeLabel.text = [NSString stringWithFormat:@"%@:%@", minsString, secsString];
}];

Answer 2

我制作了自己的播放器来播放视频。这是UISlider我制作的代码。初始化 UISlider

self.progressBar = [[[UISlider alloc] init] autorelease];
self.progressBar.frame = CGRectMake(44*frameWidth/240, 6*frameHeight/160, 187*frameWidth/240,33*frameHeight/160);
[self.progressBar addTarget:self action:@selector(progressBarChanged:) forControlEvents:UIControlEventValueChanged];
[self.progressBar addTarget:self action:@selector(proressBarChangeEnded:) forControlEvents:UIControlEventTouchUpInside];
[self.progressBar setThumbImage:[UIImage imageNamed:@"Slider_button"] forState:UIControlStateNormal];
[self.playerManageViewBottom addSubview:self.progressBar];

现在添加一个观察者和函数。

CMTime interval = CMTimeMake(33, 1000);
playbackObserver = [self.moviePlayer addPeriodicTimeObserverForInterval:interval queue:dispatch_get_current_queue() usingBlock: ^(CMTime time) {
    CMTime endTime = CMTimeConvertScale (self.moviePlayer.currentItem.asset.duration, self.moviePlayer.currentTime.timescale, kCMTimeRoundingMethod_RoundHalfAwayFromZero);
    if (CMTimeCompare(endTime, kCMTimeZero) != 0) {
        double normalizedTime = (double) self.moviePlayer.currentTime.value / (double) endTime.value;
        self.progressBar.value = normalizedTime;
    }
    self.playBackTime.text = [self getStringFromCMTime:self.moviePlayer.currentTime];
}];

职能 ：

-(void)progressBarChanged:(UISlider*)sender
{
    if (self.isPlaying) {
        [self.moviePlayer pause];
    }
    CMTime seekTime = CMTimeMakeWithSeconds(sender.value * (double)self.moviePlayer.currentItem.asset.duration.value/(double)self.moviePlayer.currentItem.asset.duration.timescale, self.moviePlayer.currentTime.timescale);
    [self.moviePlayer seekToTime:seekTime];
}


-(void)proressBarChangeEnded:(UISlider*)sender
{
    if (self.isPlaying) {
        [self.moviePlayer play];
    }
}

希望它可以帮助你。