AVPlayer 制作一個簡單的在線音樂播放器

0AC7D6DB-AC44-45E6-A457-2D1517F1DF3F.png

歌手圖片旋轉：
先設置一個全局變量動畫:

{
    CABasicAnimation* _rotationAnimation; /**< 歌手圖片旋轉動畫 */
}

初始化動畫操作,歌手圖片旋轉動畫

   // 歌手圖片動畫效果
    _rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
    _rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 2];
    _rotationAnimation.duration = kTimerInterval;
    _rotationAnimation.cumulative = YES;
    _rotationAnimation.repeatCount = CGFLOAT_MAX; // 設置旋轉次數(shù)

當歌曲開始播放的時候，將動畫操作添加到歌手圖片ImageView

[self.playerImageView.layer addAnimation:_rotationAnimation forKey:@"rotationAnimation"];

這樣，類似網易云音樂歌手圖片旋轉的效果出來了

接下來就是播放器的實現(xiàn)了，在這里使用的是AVPlayer來實現(xiàn)網絡音樂播放
AVPlayer中含有一個屬性：AVPlayerItem，這個是媒體資源，包含媒體的總時間、緩沖情況等

1.初始化一個AVPlayer

   NSURL *url = [NSURLURLWithString:@"http://mr7.doubanio.com/3fd082ae3370d22e48e300ab1d5d6590/1/fm/song/p190415_128k.mp4"];
   self.songItem = [AVPlayerItemplayerItemWithURL:url];
   self.player = [AVPlayerplayerWithPlayerItem:self.songItem];

2.播放音樂

[self.playerplay];

3.暫停音樂

[self.playerpause];

4.一個簡單的在線播放網絡音樂就完成了，接下來需要顯示歌曲的時間，首先添加一個監(jiān)聽媒體資源的加載情況

// 監(jiān)聽媒體資源緩沖情況
[self.songItem addObserver:selfforKeyPath:@"loadedTimeRanges"options:NSKeyValueObservingOptionNewcontext:nil];

5.在媒體加載時響應監(jiān)聽方法時獲取到歌曲的總時間，在這里，只需要獲取一次，由于只有一首歌，所以使用GCD的方式去獲取歌曲總時間

/**
 *  KVO監(jiān)聽方法
 *
 *  @param keyPath
 *  @param object
 *  @param change
 *  @param context
 */
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context {
    AVPlayerItem *songItem = object;
    if ([keyPath isEqualToString:@"loadedTimeRanges"]) {
        // 媒體總時長
        static dispatch_once_t onceToken;
        dispatch_once(&onceToken, ^{
            self.songTime = CMTimeGetSeconds(songItem.duration); // 獲取到媒體的總時長
        });
        // 媒體緩沖
        NSArray *array=songItem.loadedTimeRanges;
        CMTimeRange timeRange = [array.firstObject CMTimeRangeValue];//本次緩沖時間的范圍
        float startSeconds = CMTimeGetSeconds(timeRange.start);
        float durationSeconds = CMTimeGetSeconds(timeRange.duration);
        NSTimeInterval totalBuffer = startSeconds + durationSeconds;//緩沖的總長度
        NSLog(@"共緩沖：%.3f, %lf",totalBuffer, CMTimeGetSeconds(songItem.duration));
    }
}

獲取到了歌曲的時間，我們還需要顯示當前歌曲播放的時間，根據獲取到的時間去實現(xiàn)進度條的改變

__weak typeof(self) weakSelf = self;
// 監(jiān)聽播放進度
self.timeObserve = [self.player addPeriodicTimeObserverForInterval:CMTimeMake(1.0, 1.0) queue:dispatch_get_main_queue() usingBlock:^(CMTime time) {
        CGFloat current = CMTimeGetSeconds(time);
        weakSelf.currentTime = current;
 }];

到了這里，可以根據獲得到的時間來計算進度條的value，接下來是根據通過改變進度條的value來實現(xiàn)播放器播放進度，給進度條添加一個target事件

// 監(jiān)聽進度條的手動改變
[self.progress addTarget:self action:@selector(progressValueChage) forControlEvents:UIControlEventValueChanged];

當拖動進度條的監(jiān)聽方法去實現(xiàn)控制播放器的播放進度

/**
 *  進度條改變操作
 */
- (void)progressValueChage {
    CGFloat currentTime = self.songTimes * self.progress.value;
    [self.player changeProgress:currentTime];
}

/**
 *  手動改變進度
 *
 *  @param second 當前播放時間
 */
- (void)changeProgress:(CGFloat)second {
    [self.player pause];
    [self.player seekToTime:CMTimeMakeWithSeconds(second, NSEC_PER_SEC) completionHandler:^(BOOL finished) {
        [self.player play];
    }];
}

這樣一個簡單的播放器網絡音樂就完成了
最后附上完整的代碼
ViewController.m文件

#import "ViewController.h"
#import "GPPlayer.h"
#import "UIView+Category.h"

#define kImageViewWidth 230
#define kTimerInterval 20

@interface ViewController ()

@property (nonatomic, strong) GPPlayer *player; /**< 播放器 */
@property (weak, nonatomic) IBOutlet UILabel *songTimeLabel;
@property (weak, nonatomic) IBOutlet UILabel *currentTime;
@property (nonatomic, weak) UIImageView *playerImageView; /**< 歌手圖片 */
@property (weak, nonatomic) IBOutlet UISlider *progress; /**< 進度條 */
@property (nonatomic, assign) CGFloat songTimes; /**< 歌曲總時間 */

@end

@implementation ViewController

{
    CABasicAnimation* _rotationAnimation; /**< 歌手圖片旋轉動畫 */
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // 歌手圖片
    UIImageView *playerImageView = [[UIImageView alloc] init];
    playerImageView.y = 50;
    playerImageView.size = CGSizeMake(kImageViewWidth, kImageViewWidth);
    playerImageView.centerX = self.view.centerX;
    playerImageView.image = [UIImage imageNamed:@"xufei.jpg"];
    playerImageView.layer.cornerRadius = kImageViewWidth * 0.5;
    playerImageView.layer.masksToBounds = YES;
    [self.view addSubview:playerImageView];
    self.playerImageView = playerImageView;
    
    // 歌手圖片動畫效果
    _rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
    _rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 2];
    _rotationAnimation.duration = kTimerInterval;
    _rotationAnimation.cumulative = YES;
    _rotationAnimation.repeatCount = CGFLOAT_MAX; // 設置旋轉次數(shù)
    
    // 監(jiān)聽進度條的手動改變
    [self.progress addTarget:self action:@selector(progressValueChage) forControlEvents:UIControlEventValueChanged];
}

/**
 *  播放
 *
 *  @param sender
 */
- (IBAction)play:(UIButton *)sender {
    sender.showsTouchWhenHighlighted = YES;
    [self.player play];
    // 旋轉歌手圖片
    [self imageViewRotate];
}

/**
 *  播放
 *
 *  @param sender
 */
- (IBAction)pause:(UIButton *)sender {
    [self.player pause];
    [self.playerImageView.layer removeAnimationForKey:@"rotationAnimation"];
}

#pragma mark - 自定義方法

/**
 *  歌手圖片旋轉動畫
 */
- (void)imageViewRotate {
    [self.playerImageView.layer addAnimation:_rotationAnimation forKey:@"rotationAnimation"];
}

/**
 *  時間轉換
 *
 *  @param time 秒數(shù)
 *
 *  @return
 */
- (NSString *)convertStringWithTime:(float)time {
    if (isnan(time)) time = 0.f;
    int min = time / 60.0;
    int sec = time - min * 60;
    NSString * minStr = min > 9 ? [NSString stringWithFormat:@"%d",min] : [NSString stringWithFormat:@"0%d",min];
    NSString * secStr = sec > 9 ? [NSString stringWithFormat:@"%d",sec] : [NSString stringWithFormat:@"0%d",sec];
    NSString * timeStr = [NSString stringWithFormat:@"%@:%@",minStr, secStr];
    return timeStr;
}

#pragma mark - KVO
/**
 *  觀察者監(jiān)聽方法
 *
 *  @param keyPath
 *  @param object
 *  @param change
 *  @param context  
 */
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context {
    if ([keyPath isEqualToString:@"songTime"]) {
        self.songTimes = self.player.songTime;
        self.songTimeLabel.text = [self convertStringWithTime:self.player.songTime];
    } else if ([keyPath isEqualToString:@"currentTime"]) {
        self.currentTime.text = [self convertStringWithTime:self.player.currentTime];
        CGFloat pro = self.player.currentTime / self.songTimes; /**< 播放進度 */
        self.progress.value = pro;
    }
}

/**
 *  進度條改變操作
 */
- (void)progressValueChage {
    CGFloat currentTime = self.songTimes * self.progress.value;
    [self.player changeProgress:currentTime];
}

#pragma mark - 懶加載

/**
 *  播放器
 *
 *  @return
 */
- (GPPlayer *)player {
    if (_player == nil) {
        _player = [[GPPlayer alloc] init];
        [_player addObserver:self forKeyPath:@"songTime" options:NSKeyValueObservingOptionNew context:nil];
        [_player addObserver:self forKeyPath:@"currentTime" options:NSKeyValueObservingOptionNew context:nil];
    }
    
    return _player;
}

@end

GPPlayer.h

@interface GPPlayer : NSObject

@property (nonatomic, assign) CGFloat songTime; /**< 歌曲總時間 */
@property (nonatomic, assign) CGFloat currentTime; /**< 當前播放時間 */

/**
 *  播放音樂
 */
- (void)play;

/**
 *  暫停播放
 */
- (void)pause;

/**
 *  手動改變播放進度
 */
- (void)changeProgress:(CGFloat)second;

@end

GPPlayer.m

#import "GPPlayer.h"
#import <AVFoundation/AVFoundation.h>

@interface GPPlayer ()

@property (nonatomic, strong) AVPlayer *player; /**< 播放器 */
@property (nonatomic, strong) AVPlayerItem *songItem;
@property (nonatomic, strong) id timeObserve;

@end

@implementation GPPlayer

- (instancetype)init {
    if (self = [super init]) {
        [self setup];
    }
    
    return self;
}

/**
 *  初始化播放器
 */
- (void)setup {
    NSURL *url = [NSURL URLWithString:@"http://mr7.doubanio.com/3fd082ae3370d22e48e300ab1d5d6590/1/fm/song/p190415_128k.mp4"];
    self.songItem = [AVPlayerItem playerItemWithURL:url];
    self.player = [AVPlayer playerWithPlayerItem:self.songItem];
    [self addObserver];
}

/**
 *  添加觀察者
 */
- (void)addObserver {
    // 監(jiān)聽媒體資源的狀態(tài)
    [self.songItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil];
    // 監(jiān)聽媒體資源緩沖情況
    [self.songItem addObserver:self forKeyPath:@"loadedTimeRanges" options:NSKeyValueObservingOptionNew context:nil];
    __weak typeof(self) weakSelf = self;
    // 監(jiān)聽播放進度
    self.timeObserve = [self.player addPeriodicTimeObserverForInterval:CMTimeMake(1.0, 1.0) queue:dispatch_get_main_queue() usingBlock:^(CMTime time) {
        CGFloat current = CMTimeGetSeconds(time);
        weakSelf.currentTime = current;
    }];
    // 監(jiān)聽播放是否完成
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playerFinish:) name:AVPlayerItemDidPlayToEndTimeNotification object:nil];
}

/**
 *  KVO監(jiān)聽方法
 *
 *  @param keyPath
 *  @param object
 *  @param change
 *  @param context
 */
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context {
    AVPlayerItem *songItem = object;
    if ([keyPath isEqualToString:@"status"]) {
        // 媒體加載
        switch (self.player.status) {
            case AVPlayerStatusFailed:
                NSLog(@"KVO:加載失敗,網絡或者服務器出現(xiàn)問題");
                break;
                case AVPlayerStatusReadyToPlay:
                NSLog(@"KVO:準備完畢，可以播放");
                break;
                case AVPlayerStatusUnknown:
                NSLog(@"KVO:未知狀態(tài)");
                break;
        }
    } else if ([keyPath isEqualToString:@"loadedTimeRanges"]) {
        // 媒體總時長
        static dispatch_once_t onceToken;
        dispatch_once(&onceToken, ^{
            self.songTime = CMTimeGetSeconds(songItem.duration); // 獲取到媒體的總時長
        });
        // 媒體緩沖
        NSArray *array=songItem.loadedTimeRanges;
        CMTimeRange timeRange = [array.firstObject CMTimeRangeValue];//本次緩沖時間范圍
        float startSeconds = CMTimeGetSeconds(timeRange.start);
        float durationSeconds = CMTimeGetSeconds(timeRange.duration);
        NSTimeInterval totalBuffer = startSeconds + durationSeconds;//緩沖總長度
        NSLog(@"共緩沖：%.2f, %lf",totalBuffer, CMTimeGetSeconds(songItem.duration));
    }
}

/**
 *  監(jiān)聽播放器播放完成
 *
 *  @param sender 
 */
- (void)playerFinish:(NSNotification *)sender {
    NSLog(@"播放完成");
}

/**
 *  手動改變進度
 *
 *  @param second 當前播放時間
 */
- (void)changeProgress:(CGFloat)second {
    [self.player pause];
    [self.player seekToTime:CMTimeMakeWithSeconds(second, NSEC_PER_SEC) completionHandler:^(BOOL finished) {
        [self.player play];
    }];
}

#pragma mark - 播放器操作

/**
 *  播放音樂
 */
- (void)play {
    [self.player play];
}

/**
 *  暫停播放
 */
- (void)pause {
    [self.player pause];
}

@end
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