AVPlayer 可以进行全方位定制，但是不幸的是，AVPlayer 没有方便的方法来显示时间轴进度条。
AVPlayer *player = [AVPlayer playerWithURL:URL];
AVPlayerLayer *playerLayer = [[AVPlayerLayer playerLayerWithPlayer:avPlayer] retain];[self.view.layer addSubLayer:playerLayer];
我有一个进度条，用来指示视频已播放的进度和剩余的进度，就像 MPMoviePlayer 一样。
那么如何从 AVPlayer 获取视频的时间线，并更新进度条呢？
请给予建议。
double interval = .1f;
CMTime playerDuration = [self playerItemDuration]; // return player duration.
if (CMTIME_IS_INVALID(playerDuration))
{
return;
}
double duration = CMTimeGetSeconds(playerDuration);
if (isfinite(duration))
{
CGFloat width = CGRectGetWidth([yourSlider bounds]);
interval = 0.5f * duration / width;
}
/* Update the scrubber during normal playback. */
timeObserver = [[player addPeriodicTimeObserverForInterval:CMTimeMakeWithSeconds(interval, NSEC_PER_SEC)
queue:NULL
usingBlock:
^(CMTime time)
{
[self syncScrubber];
}] retain];
- (CMTime)playerItemDuration
{
AVPlayerItem *thePlayerItem = [player currentItem];
if (thePlayerItem.status == AVPlayerItemStatusReadyToPlay)
{
return([playerItem duration]);
}
return(kCMTimeInvalid);
}
在syncScrubber方法中，更新UISlider或UIProgressBar的值。
- (void)syncScrubber
{
CMTime playerDuration = [self playerItemDuration];
if (CMTIME_IS_INVALID(playerDuration))
{
yourSlider.minimumValue = 0.0;
return;
}
double duration = CMTimeGetSeconds(playerDuration);
if (isfinite(duration) && (duration > 0))
{
float minValue = [ yourSlider minimumValue];
float maxValue = [ yourSlider maximumValue];
double time = CMTimeGetSeconds([player currentTime]);
[yourSlider setValue:(maxValue - minValue) * time / duration + minValue];
}
}
感谢 iOSPawan 提供的代码！我对代码进行了简化，只保留了必要的行。这可能更容易理解该概念。基本上我是这样实现的，并且它可以正常工作。
开始播放视频之前：
__weak NSObject *weakSelf = self;
[_player addPeriodicTimeObserverForInterval:CMTimeMakeWithSeconds(1.0 / 60.0, NSEC_PER_SEC)
queue:NULL
usingBlock:^(CMTime time){
[weakSelf updateProgressBar];
}];
[_player play];
那么你需要有一种方法来更新你的进度条：
- (void)updateProgressBar
{
double duration = CMTimeGetSeconds(_playerItem.duration);
double time = CMTimeGetSeconds(_player.currentTime);
_progressView.progress = (CGFloat) (time / duration);
}
let progressView = UIProgressView(progressViewStyle: UIProgressViewStyle.Bar)
self.view.addSubview(progressView)
progressView.constrainHeight("\(1.0/UIScreen.mainScreen().scale)")
progressView.alignLeading("", trailing: "", toView: self.view)
progressView.alignBottomEdgeWithView(self.view, predicate: "")
player.addPeriodicTimeObserverForInterval(CMTimeMakeWithSeconds(1/30.0, Int32(NSEC_PER_SEC)), queue: nil) { time in
let duration = CMTimeGetSeconds(playerItem.duration)
progressView.progress = Float((CMTimeGetSeconds(time) / duration))
}
我知道这是一个老问题，但有人可能会发现它有用。这只是Swift版本：
//set the timer, which will update your progress bar. You can use whatever time interval you want
private func setupProgressTimer() {
timer = Timer.scheduledTimer(withTimeInterval: 0.02, repeats: true, block: { [weak self] (completion) in
guard let self = self else { return }
self.updateProgress()
})
}
//update progression of video, based on it's own data
private func updateProgress() {
guard let duration = player?.currentItem?.duration.seconds,
let currentMoment = player?.currentItem?.currentTime().seconds else { return }
progressBar.progress = Float(currentMoment / duration)
}
获取进度的Swifty解决方案：
private func addPeriodicTimeObserver() {
// Invoke callback every half second
let interval = CMTime(seconds: 0.5,
preferredTimescale: CMTimeScale(NSEC_PER_SEC))
// Queue on which to invoke the callback
let mainQueue = DispatchQueue.main
// Add time observer
self.playerController?.player?.addPeriodicTimeObserver(forInterval: interval, queue: mainQueue) { [weak self] time in
let currentSeconds = CMTimeGetSeconds(time)
guard let duration = self?.playerController?.player?.currentItem?.duration else { return }
let totalSeconds = CMTimeGetSeconds(duration)
let progress: Float = Float(currentSeconds/totalSeconds)
print(progress)
}
}
var timeObserver: Any?
override func viewDidLoad() {
........
let interval = CMTime(seconds: 0.05, preferredTimescale: CMTimeScale(NSEC_PER_SEC))
timeObserver = avPlayer.addPeriodicTimeObserver(forInterval: interval, queue: DispatchQueue.main, using: { elapsedTime in
self.updateSlider(elapsedTime: elapsedTime)
})
}
func updateSlider(elapsedTime: CMTime) {
let playerDuration = playerItemDuration()
if CMTIME_IS_INVALID(playerDuration) {
seekSlider.minimumValue = 0.0
return
}
let duration = Float(CMTimeGetSeconds(playerDuration))
if duration.isFinite && duration > 0 {
seekSlider.minimumValue = 0.0
seekSlider.maximumValue = duration
let time = Float(CMTimeGetSeconds(elapsedTime))
seekSlider.setValue(time, animated: true)
}
}
private func playerItemDuration() -> CMTime {
let thePlayerItem = avPlayer.currentItem
if thePlayerItem?.status == .readyToPlay {
return thePlayerItem!.duration
}
return kCMTimeInvalid
}
override func viewDidDisappear(_ animated: Bool) {
super.viewDidDisappear(animated)
avPlayer.removeTimeObserver(timeObserver!)
}
对于时间轴，我会这样做
-(void)changeSliderValue {
double duration = CMTimeGetSeconds(self.player.currentItem.duration);
[lengthSlider setMaximumValue:(float)duration];
lengthSlider.value = CMTimeGetSeconds([self.player currentTime]);
int seconds = lengthSlider.value,minutes = seconds/60,hours = minutes/60;
int secondsRemain = lengthSlider.maximumValue - seconds,minutesRemain = secondsRemain/60,hoursRemain = minutesRemain/60;
seconds = seconds-minutes*60;
minutes = minutes-hours*60;
secondsRemain = secondsRemain - minutesRemain*60;
minutesRemain = minutesRemain - hoursRemain*60;
NSString *hourStr,*minuteStr,*secondStr,*hourStrRemain,*minuteStrRemain,*secondStrRemain;
hourStr = hours > 9 ? [NSString stringWithFormat:@"%d",hours] : [NSString stringWithFormat:@"0%d",hours];
minuteStr = minutes > 9 ? [NSString stringWithFormat:@"%d",minutes] : [NSString stringWithFormat:@"0%d",minutes];
secondStr = seconds > 9 ? [NSString stringWithFormat:@"%d",seconds] : [NSString stringWithFormat:@"0%d",seconds];
hourStrRemain = hoursRemain > 9 ? [NSString stringWithFormat:@"%d",hoursRemain] : [NSString stringWithFormat:@"0%d",hoursRemain];
minuteStrRemain = minutesRemain > 9 ? [NSString stringWithFormat:@"%d",minutesRemain] : [NSString stringWithFormat:@"0%d",minutesRemain];
secondStrRemain = secondsRemain > 9 ? [NSString stringWithFormat:@"%d",secondsRemain] : [NSString stringWithFormat:@"0%d",secondsRemain];
timePlayed.text = [NSString stringWithFormat:@"%@:%@:%@",hourStr,minuteStr,secondStr];
timeRemain.text = [NSString stringWithFormat:@"-%@:%@:%@",hourStrRemain,minuteStrRemain,secondStrRemain];
导入CoreMedia框架
lengthSlider是UISlider
@interface YourClassViewController (){
NSObject * periodicPlayerTimeObserverHandle;
}
@property (nonatomic, strong) AVPlayer *player;
@property (nonatomic, strong) UIProgressView *progressView;
-(void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
if(_player != nil && ![self isPlaying])
{
[self musicPlay];
}
}
-(void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
if (_player != nil) {
[self stopPlaying];
}
}
// ----------
// PLAYER
// ----------
-(BOOL) isPlaying
{
return ([_player rate] > 0);
}
-(void) musicPlay
{
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(playerItemDidReachEnd:)
name:AVPlayerItemDidPlayToEndTimeNotification
object:[_player currentItem]];
__weak typeof(self) weakSelf = self;
periodicPlayerTimeObserverHandle = [_player addPeriodicTimeObserverForInterval:CMTimeMakeWithSeconds(1.0 / 60.0, NSEC_PER_SEC)
queue:NULL
usingBlock:^(CMTime time){
[weakSelf updateProgressBar];
}];
[_player play];
}
-(void) stopPlaying
{
@try {
if(periodicPlayerTimeObserverHandle != nil)
{
[_player removeTimeObserver:periodicPlayerTimeObserverHandle];
periodicPlayerTimeObserverHandle = nil;
}
[[NSNotificationCenter defaultCenter] removeObserver:self name:AVPlayerItemDidPlayToEndTimeNotification object:nil];
[_player pause];
}
@catch (NSException * __unused exception) {}
}
-(void) playPreviewSong:(NSURL *) previewSongURL
{
[self configureAVPlayerAndPlay:previewSongURL];
}
-(void) configureAVPlayerAndPlay: (NSURL*) url {
if(_player)
[self stopPlaying];
AVAsset *audioFileAsset = [AVURLAsset URLAssetWithURL:url options:nil];
AVPlayerItem *playerItem = [AVPlayerItem playerItemWithAsset:audioFileAsset];
_player = [AVPlayer playerWithPlayerItem:playerItem];
[_player addObserver:self forKeyPath:@"status" options:0 context:nil];
CRLPerformBlockOnMainThreadAfterDelay(^{
NSError *loadErr;
if([audioFileAsset statusOfValueForKey:@"playable" error:&loadErr] == AVKeyValueStatusLoading)
{
[audioFileAsset cancelLoading];
[self stopPlaying];
[self showNetworkError:NSLocalizedString(@"Could not play file",nil)];
}
}, NETWORK_REQUEST_TIMEOUT);
}
- (void)updateProgressBar
{
double currentTime = CMTimeGetSeconds(_player.currentTime);
if(currentTime <= 0.05){
[_progressView setProgress:(float)(0.0) animated:NO];
return;
}
if (isfinite(currentTime) && (currentTime > 0))
{
float maxValue = CMTimeGetSeconds(_player.currentItem.asset.duration);
[_progressView setProgress:(float)(currentTime/maxValue) animated:YES];
}
}
-(void) showNetworkError:(NSString*)errorMessage
{
UIAlertController *alert = [UIAlertController alertControllerWithTitle:NSLocalizedString(@"No connection", nil) message:errorMessage preferredStyle:UIAlertControllerStyleAlert];
[alert addAction:[UIAlertAction actionWithTitle:NSLocalizedString(@"OK", nil) style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {
// do nothing
}]];
[self presentViewController:alert animated:YES completion:nil];
}
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
if (object == _player && [keyPath isEqualToString:@"status"]) {
if (_player.status == AVPlayerStatusFailed) {
[self showNetworkError:NSLocalizedString(@"Could not play file", nil)];
} else if (_player.status == AVPlayerStatusReadyToPlay) {
NSLog(@"AVPlayerStatusReadyToPlay");
[TLAppAudioAccess setAudioAccess:TLAppAudioAccessType_Playback];
[self musicPlay];
} else if (_player.status == AVPlayerItemStatusUnknown) {
NSLog(@"AVPlayerItemStatusUnknown");
}
}
}
- (void)playerItemDidReachEnd:(NSNotification *)notification {
if ([notification.object isEqual:self.player.currentItem])
{
[self.player seekToTime:kCMTimeZero];
[self.player play];
}
}
-(void) dealloc{
@try {
[_player removeObserver:self forKeyPath:@"status"];
}
@catch (NSException * __unused exception) {}
[self stopPlaying];
_player = nil;
}
从技术上讲，您不需要为此添加计时器。 只需添加属性即可
private var isUserDragingSlider: Bool = false
接下来，您需要设置一个滑块目标。
步骤1
self.timeSlider.addTarget(self, action: #selector(handleSliderChangeValue(slider:event:)), for: .allEvents)
步骤2
@objc
func handleSliderChangeValue(slider: UISlider, event: UIEvent) {
if let touchEvent = event.allTouches?.first {
switch touchEvent.phase {
case .began:
self.isUserDragingSlider = true
case .ended:
self.isUserDragingSlider = false
self.updateplayerWithSliderChangeValue()
default:
break
}
}
}
func updateplayerWithSliderChangeValue() {
if let duration = player?.currentItem?.duration {
let totalSeconds = CMTimeGetSeconds(duration)
if !(totalSeconds.isNaN || totalSeconds.isInfinite) {
let newCurrentTime: TimeInterval = Double(self.timeSlider.value) * CMTimeGetSeconds(duration)
let seekToTime: CMTime = CMTimeMakeWithSeconds(newCurrentTime, preferredTimescale: 600)
self.player?.seek(to: seekToTime)
self.isUserDragingSlider.toggle()
}
}
}
func setupSliderValue(_ seconds: Float64) {
guard !(seconds.isNaN || seconds.isInfinite) else {
return
}
if !isUserDragingSlider {
if let duration = self.player?.currentItem?.duration {
let durationInSeconds = CMTimeGetSeconds(duration)
self.timeSlider.value = Float(seconds / durationInSeconds)
}
}
}
这里的主要问题是，当我们移动滑块时，更新滑块（来自视频）和使用滑块更改更新视频之间存在冲突。
这就是为什么滑块不能正常工作的原因。当您使用isUserDragingSlider阻止从视频时间到滑块的更新时，一切都正常工作。