iOS 学习笔记(一) 视频引导页的制作_视频加引导页-优快云博客

本文链接：https://blog.youkuaiyun.com/wanna_dance/article/details/54379924

本文介绍了一种在iOS应用中实现视频引导页的方法。通过将AVPlayerLayer加载到UIView并嵌套在UIScrollView中，实现随着页面滑动自动切换并播放不同视频的功能。文章详细展示了如何利用AVFoundation框架来管理和控制视频播放。

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话不多说先上图这里写图片描述

基本思路

1.把 AVPlayerLayer加载到 UIView 上 UIView 加载到 ScrollView上,讲player加载到一个可变数组里
2.滑动 ScrollView的时候切换 view 的页面切换 view 的页面,先把上一个页面的播放器暂停并且把它重置到初始状态将当前也页面的播放器从数组里面取出加载播放

1.准备步骤

(1)几个本地视频资源这里示例讲到的是.mov 格式的
(2)playVideoArray = [[NSMutableArray alloc]init];

2.代码过程

//准备代码用 for 循环给 scrolleview 和数组添加内容
//示例只有两个资源就使用的2个了

for (count = 0 ; count <  2; count++) {

        NSString *urlStr = [MSPath fullPathFromAssetsInMainBundle:[NSString stringWithFormat:***这里写上你的资源路径***@"guideMov/guideMov%d.mov",count+1]];
        NSURL *videoURL = [NSURL fileURLWithPath:urlStr];

        AVAsset *movieAsset = [AVURLAsset URLAssetWithURL:videoURL options:nil];
 //使用playerItem获取视频的信息，当前播放时间，总时间等
    AVPlayerItem *playerItem = [AVPlayerItem playerItemWithURL:movieURL];

        AVPlayerItem * playerItem = [AVPlayerItem playerItemWithAsset:movieAsset];

        //创建AVPlayer  播放器
        AVPlayer * player = [AVPlayer playerWithPlayerItem:playerItem];

        //创建一个AVPlayerLayer  用于加在 UIView 上
        AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:player];
        playerLayer.frame = self.view.bounds;
        playerLayer.videoGravity = AVLayerVideoGravityResizeAspect;


        UIView *playView = [[UIView alloc]initWithFrame:(CGRect){pw * count,0,pw,ph}];
        //将playerLayer加入 UIView 的 layer 层
        [playView.layer addSublayer:playerLayer];

        [mScrollView addSubview:playView];

        //把player 加载到 playVideoArray 数组里
        [playVideoArray addObject:player];

        if (count == 0) {
            currentMovieIndex = count;
            [player play];
        }
 }

以上的代码是准备工作

下面是 scollerview 的代理方法

pragma mark UIScrollView delegate

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    //更新UIPageControl的当前页
    CGPoint offset = scrollView.contentOffset;
    CGRect bounds = scrollView.frame;
    NSInteger pageChange =  offset.x/bounds.size.width;

    if (pageChange == currentMovieIndex) {
        return;
    }

    if (self.guideArrow) {
        [self.guideArrow removeFromSuperview];
    }
    //拿出上一个的播放器 

    AVPlayer *prePlayer = [playVideoArray objectAtIndex:currentMovieIndex];
    //把它暂停
    [prePlayer pause];
    //把它重置
    [prePlayer replaceCurrentItemWithPlayerItem://(这个是取出播放器)[self getPlayerItem]];

    currentMovieIndex = pageChange;
    //拿出当前的播放器
    AVPlayer *curPlayer = [playVideoArray objectAtIndex:currentMovieIndex];
    //进行播放
    [curPlayer play];

    [mPageControl setCurrentPage:pageChange];
}

- (AVPlayerItem *)getPlayerItem{
    NSString *urlStr = [MSPath fullPathFromAssetsInMainBundle:[NSString stringWithFormat:@"guideMov/guideMov%ld.mov",currentMovieIndex+1]];
    NSURL *videoURL = [NSURL fileURLWithPath:urlStr];

    AVAsset *movieAsset = [AVURLAsset URLAssetWithURL:videoURL options:nil];
    AVPlayerItem * playerItem = [AVPlayerItem playerItemWithAsset:movieAsset];
    return playerItem;
}