Objective-C AVPlayer播放视频的使用与封装

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大致效果

不要介意。界面有点丑。。。

界面搭建

看下成员变量就知道我怎么搭建的了,这里我将video播放层的size作为参照量，对所有控件的size按照其video的size宽高进行比例缩放

@interface VideoPlayerView()

@property (nonatomic,copy) NSString *path;                  //播放地址 自动判断文件路径和网址路径

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

@property (nonatomic,strong) AVPlayerLayer *playerlayer;    //显示区域

@property (nonatomic,strong) UIButton *playBtn;             //播放暂停

@property (nonatomic,strong) UIButton *stopBtn;             // 停止

@property (nonatomic,strong) UIButton *fullScreenBtn;       //全屏

@property (nonatomic,strong) UISlider *playSlider;          //进度选择

@property (nonatomic,strong) UIProgressView *progress;      //进度

@property (nonatomic,strong) UILabel *currentTimeLab;       //当前时间

@property (nonatomic,strong) UILabel *durationLab;          //总时间

@property (nonatomic,strong) UIView *toolView;              //工具栏view

@property (nonatomic,assign) BOOL isFullScreen;             //全屏判断

@property (nonatomic,assign) CGFloat videoHeight;           //video高

@property (nonatomic,assign) CGFloat videoWidth;            //video宽

@end

所有控件使用懒加载如下

//播放暂停

- (UIButton *)playBtn {

    if (!_playBtn) {

        _playBtn = [[UIButton alloc] initWithFrame:CGRectMake(kLrMargin, kUIy, kBtnWidth, kUIHeight)];

        _playBtn.backgroundColor  =[UIColor greenColor];

        _playBtn.selected = NO;

        _playBtn.enabled = NO;

        _playBtn.titleLabel.adjustsFontSizeToFitWidth = YES;

        [_playBtn setTitle:@"播放" forState:UIControlStateNormal];

        [_playBtn setTitle:@"暂停" forState:UIControlStateSelected];

        [_playBtn addTarget:self action:@selector(play) forControlEvents:UIControlEventTouchUpInside];

    }

    return _playBtn;

}

屏幕适配

由于涉及到屏幕的旋转和适配。我这里没有使用第三方框架来做约束，而是使用最基本的按百分比设置frame。旋转屏幕时通过调用本类 - (void)resetFrame:(CGSize)size; 方法来重设frame。所以需要重设frame的控件在懒加载中设置frame，调用时即刷新frame。

先看下初始化对video的size设置是时始终用最小的边来确定高度，宽度与屏幕当前宽度相当

//初始化

- (instancetype)initWithFrame:(CGRect)frame andPath:(NSString*)path {

    self = [super initWithFrame:frame];

    if (self) {

        self.backgroundColor = [UIColor clearColor];

        self.path = path;

        CGFloat width = [UIScreen mainScreen].bounds.size.width;

        CGFloat height = [UIScreen mainScreen].bounds.size.height;

        self.videoHeight = height > width ? width * 0.6 : height * 0.6;

        self.videoWidth = [UIScreen mainScreen].bounds.size.width-2*kLrMargin;

        [self.layer addSublayer:self.playerlayer];

        [self addSubview:self.toolView];

    }

    return self;

}

屏幕旋转时做一些事

//屏幕旋转时触发 这里写在父类中

- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {

    [self.videoView resetFrame:size];

}

//旋转屏幕重设frame

- (void)resetFrame:(CGSize)size {

    CGFloat width = size.width;

    CGFloat height = size.height;

    self.videoHeight = height > width ? width * 0.6 : height * 0.6;

    self.videoWidth = size.width - 2 * kLrMargin;

    if (self.isFullScreen) {

        //全屏时旋转

        [self setPlayerWithPosition:CGPointZero andSize:size];

    } else {

        //普通旋转

        [self setPlayerWithPosition:CGPointMake(kLrMargin, kTopMargin) andSize:CGSizeMake(self.videoWidth, self.videoHeight)];

        //刷新frame

        [self toolView];

        [self playSlider];

        [self progress];

    }

}

懒加载刷新frame

//进度懒加载 调用时只刷新frame

- (UIProgressView *)progress {

    if (!_progress) {

        _progress = [[UIProgressView alloc] init];

        _progress.progress = 0;

    }

    _progress.frame = CGRectMake(2, self.playSlider.frame.size.height/2, self.playSlider.frame.size.width-2-2, kUIHeight);

    return _progress;

}

AVPlayer的基本操作

基本操作包括播放、暂停、停止、播放指定位置、缓存进度

播放网络地址时在info.plist中添加 App Transport Security Settings字典中添加Allow Arbitrary Loads元素值为YES

使用AVPlayer播放视频就必须用到AVPlayerlayer用来显示播放视图。

//加载显示层

- (AVPlayerLayer*)playerlayer {

    if (!_playerlayer) {

        _playerlayer = [AVPlayerLayer playerLayerWithPlayer:self.player];

        _playerlayer.bounds = CGRectMake(0, 0, self.videoWidth, self.videoHeight);

        _playerlayer.anchorPoint = CGPointMake(0, 0);

        _playerlayer.position = CGPointMake(kLrMargin, kTopMargin);

        _playerlayer.backgroundColor = [UIColor blackColor].CGColor;

    }

    return _playerlayer;

}

//加载播放类

- (AVPlayer *)player {

    if (!_player) {

        _player = [AVPlayer playerWithURL:[self getUrlPath:self.path]];

        //kvo注册

        [self addObservers];

    }

    return _player;

}

使用KVO对状态和缓存进行检测，添加KVO时养成习惯写好移除操作

//注册kvo

- (void)addObservers{

    [self.player.currentItem addObserver:self forKeyPath:kItemStatus options:NSKeyValueObservingOptionNew context:nil];

    [self.player.currentItem addObserver:self forKeyPath:kItemLoadedTimeRanges options:NSKeyValueObservingOptionNew context:nil];

}

//移除kvo

- (void)dealloc {

    [self.player.currentItem removeObserver:self forKeyPath:kItemStatus];

    [self.player.currentItem removeObserver:self forKeyPath:kItemLoadedTimeRanges];

}

//kvo回调

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context {

    if ([keyPath isEqualToString:kItemStatus]) {

        AVPlayerItem *item = object;

        if (item.status == AVPlayerItemStatusReadyToPlay) {

            //准备播放

            [self readyToplayWithItem:item];

        }else if (item.status == AVPlayerItemStatusUnknown) {

            //播放失败

           //这里写个alertView提示下就行

        }else if (item.status == AVPlayerItemStatusFailed) {

            //播放失败

            //同上

        }

    } else if ([keyPath isEqualToString:kItemLoadedTimeRanges]) {

        AVPlayerItem *item = object;

        [self getLoadedTimeRanges:item];

    }

}

基础功能

//播放 暂停

- (void)play {

    if (self.playBtn.selected) {

        self.playBtn.selected = NO;

        [self.player pause];

    } else {

        self.playBtn.selected = YES;

        [self.player play];

        [self timerStar];

    }

}

//停止

- (void)stop {

    [self.player pause];

    [self.player seekToTime:CMTimeMake(0, 1)];

    self.playBtn.selected = NO;

}

//全屏

- (void)fullScreen {

    self.toolView.hidden = YES;

    self.isFullScreen = YES;

    self.backgroundColor = [UIColor blackColor];

    self.playerlayer.bounds = [UIScreen mainScreen].bounds;

    self.playerlayer.anchorPoint = CGPointMake(0, 0);

    self.playerlayer.position = CGPointMake(0, 0);

}

//播放指定位置

- (void)playCurrentVideo {

    self.playBtn.selected = YES;

    NSTimeInterval second = self.playSlider.value;

    [self.player.currentItem seekToTime:CMTimeMake(second,1)];

    [self.player play];

    [self timerStar];

}

具体操作
- 包括格式化时间
- 格式化路径
- 播放准备
- 缓存计算
- 触摸关闭全屏
- 设置video的大小位置

//设置video的frame

- (void)setPlayerWithPosition:(CGPoint)position andSize:(CGSize)size {

    self.playerlayer.anchorPoint = CGPointMake(0, 0);

    self.playerlayer.position = position;

    self.playerlayer.bounds = CGRectMake(0, 0, size.width, size.height);

}

//准备播放

- (void)readyToplayWithItem:(AVPlayerItem*)item {

    self.playBtn.enabled = YES;

    long long durationSecond = item.duration.value / item.duration.timescale;

    self.durationLab.text = [NSString stringWithFormat:@" / %@",[self getFormatDate:durationSecond]];

    self.playSlider.maximumValue = durationSecond;

    self.playSlider.minimumValue = 0;

    [self.playSlider addTarget:self action:@selector(playCurrentVideo) forControlEvents:UIControlEventValueChanged];

}

//获得缓存

- (void)getLoadedTimeRanges:(AVPlayerItem*)item {

    NSValue *value = [item.loadedTimeRanges lastObject];

    CMTimeRange range = [value CMTimeRangeValue];

    long long cacheSecond = range.start.value/range.start.timescale + range.duration.value/range.duration.timescale;

    long long currentSecond = item.currentTime.value / item.currentTime.timescale;

    self.progress.progress = (currentSecond + cacheSecond) * 0.1;

}

//格式化时间

- (NSString*)getFormatDate:(NSTimeInterval)time {

    int seconds = (int)time % 60;

    int minutes = (int)(time / 60) % 60;

    int hours = (int)time / 3600;

    return [NSString stringWithFormat:@"%02d:%02d:%02d",hours,minutes,seconds];

}

//格式化url路径

- (NSURL*)getUrlPath:(NSString*)path {

    NSURL *url;

    if ([self.path containsString:@"http"]) {

        url = [NSURL URLWithString:self.path];

    } else {

        url = [NSURL fileURLWithPath:self.path];

    }

    return url;

}

//开启定时

- (void)timerStar {

    //定时回调

    __weak typeof(self) weakSelf = self;

    [self.player addPeriodicTimeObserverForInterval:CMTimeMake(1, 1) queue:NULL usingBlock:^(CMTime time) {

        long long current = weakSelf.player.currentItem.currentTime.value / weakSelf.player.currentItem.currentTime.timescale;

        weakSelf.playSlider.value = current;

        NSString *currentFormat = [weakSelf getFormatDate:current];

        weakSelf.currentTimeLab.text = [NSString stringWithFormat:@"%@",currentFormat];

    }];

}

//触摸关闭全屏

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {

    if (self.isFullScreen) {

        self.toolView.hidden = NO;

        self.backgroundColor = [UIColor clearColor];

        [self setPlayerWithPosition:CGPointMake(kLrMargin, kTopMargin) andSize:CGSizeMake(self.videoWidth, self.videoHeight)];

        [self toolView];

        [self playSlider];

        [self progress];

        self.isFullScreen = NO;

    }

}