Fatal编程技术网
  • ios/
  • Ios 如何将UISlider添加到AVPlayer

Ios 如何将UISlider添加到AVPlayer

ios objective-c cocoa-touch

Ios 如何将UISlider添加到AVPlayer,ios,objective-c,cocoa-touch,avplayer,Ios,Objective C,Cocoa Touch,Avplayer,我想将uislider添加到我的播放器中，以便在AVPlayer中播放音频时实现擦洗。第一首歌一放完，uislider就会回到原来的位置，下一首歌就会开始播放。如果有人帮我，我会很感激的。这是我的密码 -(IBAction)goToiPodLibrary:(UIButton *)sender { // Create picker view MPMediaPickerController* picker = [[MPMediaPickerController alloc] ini

我想将uislider添加到我的播放器中，以便在AVPlayer中播放音频时实现擦洗。第一首歌一放完，uislider就会回到原来的位置，下一首歌就会开始播放。如果有人帮我，我会很感激的。这是我的密码

-(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];

}
这是我的代码在线播放音频歌曲与音量滑块。您可以轻松地增加和减少音量。使用AvAudioPlayer

*

*

使用
UISlider
（这里称为timeSlider）和上述方法

以下是播放时如何更新滑块：

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];
}];

self.playbackObserver=[player addPeriodicTimeObserverForInterval:interval队列：NULL usingBlock:^（CMTime）{
CMTime endTime=CMTimeConvertScale（player.currentItem.asset.duration，player.currentTime.timescale，kCMTimeRoundingMethod\u RoundHalfAway从零开始）；
如果（CMTimeCompare（endTime，kCMTimeZero）！=0）{
double normalizedTime=（double）player.currentTime.value/（double）endTime.value；
self.timeSlider.value=normalizedTime；
}
Float64 currentSeconds=CMTimeGetSeconds（player.currentTime）；
int分钟=当前秒/60.0；
int secs=fmodf（当前秒，60.0）；
NSString*MINSTRING=mins<10？[NSString stringWithFormat:@“0%d”，分钟]：[NSString stringWithFormat:@“%d”，分钟]；
NSString*secsString=secs<10？[NSString stringWithFormat:@“0%d”，secs]：[NSString stringWithFormat:@“%d”，secs]；
currentTimeLabel.text=[NSString stringWithFormat:@“%@:%@”，minsString，secsString]；
}];
我制作了自己的播放器来播放视频。这是我制作的
UISlider
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];
    }
}


-（无效）progressBarChanged:（UISlider*）发送方
{
if（自显示）{
[self.moviePlayer暂停]；
}
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 seekTime:seekTime]；
}

-（无效）PropressBarChangeEnded:（UISlider*）发送方
{
if（自显示）{
[self.moviePlayer play]；
}
}


希望它能帮助您。
我尝试了顶级解决方案，对于较长的视频，这是可以的，但当我有一个~4秒的视频时，UISlider非常不稳定。如果需要精度，请尝试以下解决方案：


- (IBAction)sliderSlid:(id)sender {
    if ([sender isKindOfClass:[UISlider class]]) {
        UISlider *slider = sender;

        CMTime playerDuration = player.currentItem.duration;
        if (CMTIME_IS_INVALID(playerDuration)) {
            return;
        }

        double duration = CMTimeGetSeconds(playerDuration);
        if (isfinite(duration)) {
            float minValue = [slider minimumValue];
            float maxValue = [slider maximumValue];
            float value = [slider value];

            double time = duration * (value - minValue) / (maxValue - minValue);

            [player seekToTime:CMTimeMakeWithSeconds(time, NSEC_PER_SEC) toleranceBefore:kCMTimeZero toleranceAfter:kCMTimeZero];
        }
        [player pause];
    }
}



伙计，我猜他要的是擦洗器…，不是音量吧我不要音量吧我要的是擦洗器，我用的是AVPlayer不是AvaudioPlayerPath是timeslider是uislider的对象…所以每当一首新歌开始播放时，滑块会自动从头开始播放？pat播放列表中的歌曲在tableview中。。我有一些问题，我可以发电子邮件给你吗？如果可以的话，持续时间是多少秒？我可以给它赋值吗？它是一个浮点数。例如，可以是0.2


-(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];
    }
}

- (IBAction)sliderSlid:(id)sender {
    if ([sender isKindOfClass:[UISlider class]]) {
        UISlider *slider = sender;

        CMTime playerDuration = player.currentItem.duration;
        if (CMTIME_IS_INVALID(playerDuration)) {
            return;
        }

        double duration = CMTimeGetSeconds(playerDuration);
        if (isfinite(duration)) {
            float minValue = [slider minimumValue];
            float maxValue = [slider maximumValue];
            float value = [slider value];

            double time = duration * (value - minValue) / (maxValue - minValue);

            [player seekToTime:CMTimeMakeWithSeconds(time, NSEC_PER_SEC) toleranceBefore:kCMTimeZero toleranceAfter:kCMTimeZero];
        }
        [player pause];
    }
}