视频

1.iOS提供了MPMoviePlayerController、MPMoviePlayerViewController两个类，可以用来轻松播放视频和网络流媒体/网络音频

提示：网络音频同样使用此控制器播放
YouTobe就是用MPMoviePlayerController实现的
MPMoviePlayerViewController只能全屏播放视频
上述两个类都定义在了MediaPlayer框架中

2.MPMoviePlayerController

继承自NSObject
内部有个view可以展示视频内容
将该视图添加其他控制器的view上，即可显示视频内容
MPMoviePlayerController可以播放的视频格式包括：
H.264、MPEG-4等
支持的文件扩展名包括：avi,mkv,mov,m4v,mp4等

可以从苹果官网：http://support.apple.com/kb/HT1425下载一些用来测试的视频文件，文件都比较小

提示：MPMoviePlayerController并不支持所有的视频格式，如果要播放不支持的视频格式，需要借助第三方框架进行解码，如VLC
https://github.com/videolan/vlc

3.MPMoviePlayerController的使用

加载视频资源(注意，如果url为nil同样可以加载)
NSAssert(self.url, @"URL不能为空");
[[MPMoviePlayerController alloc] initWithContentURL:self.url];
显示
[self.view addSubview:self.moviePlayer.view];
通过设置AutoresizingMask属性可以在横竖屏转换时自动调整视图大小
播放
[self.moviePlayer play];
全屏
[self.moviePlayer setFullscreen:YES animated:YES];

MPMoviePlayerController的播放状态是通过通知中心监听的

4.常用监听通知事件

状态变化
MPMoviePlayerPlaybackStateDidChangeNotification
播放结束
MPMoviePlayerPlaybackDidFinishNotification
退出全屏
MPMoviePlayerDidExitFullscreenNotification
截屏完成
MPMoviePlayerThumbnailImageRequestDidFinishNotification

截屏方法
-requestThumbnailImagesAtTimes:timeOption:

5.AVPlayer

import "ViewController.h"
#import 

@interface ViewController ()

/** 播放器 */
@property (nonatomic, strong) AVPlayer *player;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [self.player play];
}

#pragma mark - 懒加载代码
- (AVPlayer *)player
{
    if (_player == nil) {
        // 1.获取URL(远程/本地)
        // NSURL *url = [[NSBundle mainBundle] URLForResource:@"01-知识回顾.mp4" withExtension:nil];
        NSURL *url = [NSURL URLWithString:@"http://v1.mukewang.com/a45016f4-08d6-4277-abe6-bcfd5244c201/L.mp4"];
        
        // 2.创建AVPlayerItem
        AVPlayerItem *item = [AVPlayerItem playerItemWithURL:url];
        
        // 3.创建AVPlayer
        _player = [AVPlayer playerWithPlayerItem:item];
        
        // 4.添加AVPlayerLayer
        AVPlayerLayer *layer = [AVPlayerLayer playerLayerWithPlayer:self.player];
        layer.frame = CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.width * 9 / 16);
        [self.view.layer addSublayer:layer];
    }
    return _player;
}

@end

6.AVPlayer中view的封装

#import 
#import 

@protocol VideoPlayViewDelegate 

@optional
- (void)videoplayViewSwitchOrientation:(BOOL)isFull;

@end

@interface VideoPlayView : UIView

+ (instancetype)videoPlayView;

@property (weak, nonatomic) id delegate;

@property (nonatomic, strong) AVPlayerItem *playerItem;

@end
#import "VideoPlayView.h"

@interface VideoPlayView()

/* 播放器 */
@property (nonatomic, strong) AVPlayer *player;

// 播放器的Layer
@property (weak, nonatomic) AVPlayerLayer *playerLayer;

@property (weak, nonatomic) IBOutlet UIImageView *imageView;
@property (weak, nonatomic) IBOutlet UIView *toolView;
@property (weak, nonatomic) IBOutlet UIButton *playOrPauseBtn;
@property (weak, nonatomic) IBOutlet UISlider *progressSlider;
@property (weak, nonatomic) IBOutlet UILabel *timeLabel;

// 记录当前是否显示了工具栏
@property (assign, nonatomic) BOOL isShowToolView;

/* 定时器 */
@property (nonatomic, strong) NSTimer *progressTimer;

#pragma mark - 监听事件的处理
- (IBAction)playOrPause:(UIButton *)sender;
- (IBAction)switchOrientation:(UIButton *)sender;
- (IBAction)slider;
- (IBAction)startSlider;
- (IBAction)tapAction:(UITapGestureRecognizer *)sender;
- (IBAction)sliderValueChange;

@end

@implementation VideoPlayView

// 快速创建View的方法
+ (instancetype)videoPlayView
{
    return [[[NSBundle mainBundle] loadNibNamed:@"VideoPlayView" owner:nil options:nil] firstObject];
}

- (void)awakeFromNib
{
    self.player = [[AVPlayer alloc] init];
    self.playerLayer = [AVPlayerLayer playerLayerWithPlayer:self.player];
    [self.imageView.layer addSublayer:self.playerLayer];
    
    self.toolView.alpha = 0;
    self.isShowToolView = NO;
    
    [self.progressSlider setThumbImage:[UIImage imageNamed:@"thumbImage"] forState:UIControlStateNormal];
    [self.progressSlider setMaximumTrackImage:[UIImage imageNamed:@"MaximumTrackImage"] forState:UIControlStateNormal];
    [self.progressSlider setMinimumTrackImage:[UIImage imageNamed:@"MinimumTrackImage"] forState:UIControlStateNormal];
    
    [self removeProgressTimer];
    [self addProgressTimer];
    
    self.playOrPauseBtn.selected = YES;
}

- (void)layoutSubviews
{
    [super layoutSubviews];
    
    self.playerLayer.frame = self.bounds;
}

#pragma mark - 设置播放的视频
- (void)setPlayerItem:(AVPlayerItem *)playerItem
{
    _playerItem = playerItem;
    [self.player replaceCurrentItemWithPlayerItem:playerItem];
    [self.player play];
}

// 是否显示工具的View
- (IBAction)tapAction:(UITapGestureRecognizer *)sender {
    [UIView animateWithDuration:0.5 animations:^{
        if (self.isShowToolView) {
            self.toolView.alpha = 0;
            self.isShowToolView = NO;
        } else {
            self.toolView.alpha = 1;
            self.isShowToolView = YES;
        }
    }];
}
// 暂停按钮的监听
- (IBAction)playOrPause:(UIButton *)sender {
    sender.selected = !sender.selected;
    if (sender.selected) {
        [self.player play];
        
        [self addProgressTimer];
    } else {
        [self.player pause];
        
        [self removeProgressTimer];
    }
}

#pragma mark - 定时器操作
- (void)addProgressTimer
{
    self.progressTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateProgressInfo) userInfo:nil repeats:YES];
    [[NSRunLoop mainRunLoop] addTimer:self.progressTimer forMode:NSRunLoopCommonModes];
}

- (void)removeProgressTimer
{
    [self.progressTimer invalidate];
    self.progressTimer = nil;
}

- (void)updateProgressInfo
{
    // 1.更新时间
    self.timeLabel.text = [self timeString];
    
    // 2.设置进度条的value
    self.progressSlider.value = CMTimeGetSeconds(self.player.currentTime) / CMTimeGetSeconds(self.player.currentItem.duration);
}

- (NSString *)timeString
{
    NSTimeInterval duration = CMTimeGetSeconds(self.player.currentItem.duration);
    NSTimeInterval currentTime = CMTimeGetSeconds(self.player.currentTime);
    
    return [self stringWithCurrentTime:currentTime duration:duration];
}

// 切换屏幕的方向
- (IBAction)switchOrientation:(UIButton *)sender {
    sender.selected = !sender.selected;
    if ([self.delegate respondsToSelector:@selector(videoplayViewSwitchOrientation:)]) {
        [self.delegate videoplayViewSwitchOrientation:sender.selected];
    }
}

- (IBAction)slider {
    [self addProgressTimer];
    NSTimeInterval currentTime = CMTimeGetSeconds(self.player.currentItem.duration) * self.progressSlider.value;
    
    // 设置当前播放时间
    [self.player seekToTime:CMTimeMakeWithSeconds(currentTime, NSEC_PER_SEC) toleranceBefore:kCMTimeZero toleranceAfter:kCMTimeZero];
    
    [self.player play];
}

- (IBAction)startSlider {
    [self removeProgressTimer];
}

- (IBAction)sliderValueChange {
    NSTimeInterval currentTime = CMTimeGetSeconds(self.player.currentItem.duration) * self.progressSlider.value;
    NSTimeInterval duration = CMTimeGetSeconds(self.player.currentItem.duration);
    self.timeLabel.text = [self stringWithCurrentTime:currentTime duration:duration];
}

- (NSString *)stringWithCurrentTime:(NSTimeInterval)currentTime duration:(NSTimeInterval)duration
{
    NSInteger dMin = duration / 60;
    NSInteger dSec = (NSInteger)duration % 60;
    
    NSInteger cMin = currentTime / 60;
    NSInteger cSec = (NSInteger)currentTime % 60;
    
    NSString *durationString = [NSString stringWithFormat:@"%02ld:%02ld", dMin, dSec];
    NSString *currentString = [NSString stringWithFormat:@"%02ld:%02ld", cMin, cSec];
    
    return [NSString stringWithFormat:@"%@/%@", currentString, durationString];
}

@end

屏幕快照 2017-06-25 下午5.49.24.png

7.MPMoviePlayerController的代码实现

#import "ViewController.h"
#import 

@interface ViewController ()

/** 播放器 */
@property (nonatomic, strong) MPMoviePlayerController *playerController;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [self.playerController play];
}

#pragma mark - 懒加载代码
- (MPMoviePlayerController *)playerController
{
    if (_playerController == nil) {
        // 1.获取视频的URL
        NSURL *url = [NSURL URLWithString:@"http://v1.mukewang.com/19954d8f-e2c2-4c0a-b8c1-a4c826b5ca8b/L.mp4"];
        
        // 2.创建控制器
        _playerController = [[MPMoviePlayerController alloc] initWithContentURL:url];
        
        // 3.设置控制器的View的位置
        _playerController.view.frame = CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.width * 9 / 16);
        
        // 4.将View添加到控制器上
        [self.view addSubview:_playerController.view];
        
        // 5.设置属性
        _playerController.controlStyle = MPMovieControlStyleNone;
    }
    return _playerController;
}

@end

8.MPMoviePlayerViewController的代码实现

#import "ViewController.h"
#import 

@interface ViewController ()

/** 播放器 */
@property (nonatomic, strong) MPMoviePlayerViewController *playerVc;
- (IBAction)play;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
}

- (IBAction)play {
    [self presentMoviePlayerViewControllerAnimated:self.playerVc];
}

#pragma mark - 懒加载
- (MPMoviePlayerViewController *)playerVc
{
    if (_playerVc == nil) {
        NSURL *url = [NSURL URLWithString:@"http://v1.mukewang.com/a45016f4-08d6-4277-abe6-bcfd5244c201/L.mp4"];
        
        _playerVc = [[MPMoviePlayerViewController alloc] initWithContentURL:url];;
    }
    return _playerVc;
}

@end