ios – 播放堆叠的视频

我有多个imageview子视图根据我的传入数据进行堆叠.基本上所有这些子视图都是基于我的传入数据设置为图像或视频图层.我遇到的问题是播放视频.我可以在堆叠中播放第一个视频,但每个视频之后只是第一个视频的声音.我如何相应地玩？

通过点击事件(如snapchat)浏览视图.见下文：

@interface SceneImageViewController ()

@property (strong,nonatomic) NSURL *videoUrl;
@property (strong,nonatomic) AVPlayer *avPlayer;
@property (strong,nonatomic) AVPlayerLayer *avPlayerLayer;

@end

@implementation SceneImageViewController

- (void)viewDidLoad {

[super viewDidLoad];

self.mySubviews = [[NSMutableArray alloc] init];
self.videoCounterTags = [[NSMutableArray alloc] init];

int c = (int)[self.scenes count];
c--;
NSLog(@"int c = %d",c);
self.myCounter = [NSNumber numberWithInt:c];


for (int i=0; i<=c; i++) {

    //create imageView
    UIImageView *imageView =[[UIImageView alloc] initWithFrame:CGRectMake(0,self.view.bounds.size.width,self.view.bounds.size.height)];
    [imageView setUserInteractionEnabled:YES]; // <--- This is very important
    imageView.tag = i;                        // <--- Add tag to track this subview in the view stack
    [self.view addSubview:imageView];
    NSLog(@"added image view %d",i);


    //get scene object
    PFObject *sceneObject = self.scenes[i];


    //get the PFFile and filetype
    PFFile *file = [sceneObject objectForKey:@"file"];
    Nsstring *fileType = [sceneObject objectForKey:@"fileType"];



    //check the filetype
    if ([fileType  isEqual: @"image"])
    {
        dispatch_async(dispatch_get_global_queue(disPATCH_QUEUE_PRIORITY_HIGH,0),^{
        //get image
        NSURL *imageFileUrl = [[NSURL alloc] initWithString:file.url];
        NSData *imageData = [NSData dataWithContentsOfURL:imageFileUrl];
            dispatch_async(dispatch_get_main_queue(),^{
        imageView.image = [UIImage imageWithData:imageData];
            });
        });

    }

    //its a video
    else
    {
        // the video player
        NSURL *fileUrl = [NSURL URLWithString:file.url];

        self.avPlayer = [AVPlayer playerWithURL:fileUrl];
        self.avPlayer.actionAtItemEnd = AVPlayerActionAtItemEndNone;

        self.avPlayerLayer = [AVPlayerLayer playerLayerWithPlayer:self.avPlayer];
        //self.avPlayerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;

        [[NSNotificationCenter defaultCenter] addobserver:self
                                                 selector:@selector(playerItemDidReachEnd:)
                                                     name:AVPlayerItemDidplayToEndTimeNotification
                                                   object:[self.avPlayer currentItem]];

        CGRect screenRect = [[UIScreen mainScreen] bounds];

        self.avPlayerLayer.frame = CGRectMake(0,screenRect.size.width,screenRect.size.height);
        [imageView.layer addSublayer:self.avPlayerLayer];

        NSNumber *tag = [NSNumber numberWithInt:i+1];

        NSLog(@"tag = %@",tag);

        [self.videoCounterTags addobject:tag];

        //[self.avPlayer play];
    }



}



UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(viewTapped:)];

[self.view bringSubviewToFront:self.screen];

[self.screen addGestureRecognizer:tapGesture];


}


 - (void)viewTapped:(UIGestureRecognizer *)gesture{

NSLog(@"touch!");

[self.avPlayer pause];

int i = [self.myCounter intValue];
NSLog(@"counter = %d",i);



for(UIImageView *subview in [self.view subviews]) {

    if(subview.tag== i) {

        [subview removeFromSuperview];
    }
}

if ([self.videoCounterTags containsObject:self.myCounter]) {
    NSLog(@"play video!!!");
    [self.avPlayer play];
}

if (i == 0) {
    [self.avPlayer pause];
    [self.navigationController popViewControllerAnimated:NO];
}


i--;
self.myCounter = [NSNumber numberWithInt:i];


NSLog(@"counter after = %d",i);





}

UIImageView *imageView =[[UIImageView alloc] initWithFrame:CGRectMake(0,self.view.bounds.size.height)];
[imageView setUserInteractionEnabled:YES]; // <--- This is very important
imageView.tag = i;                        // <--- Add tag to track this subview in the view stack
[self.view addSubview:imageView];
NSLog(@"added image view %d",i);
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:imageView action:@selector(viewTapped:)];
[imageView addGestureRecognizer:tapGesture];

// the video player
            NSNumber *tag = [NSNumber numberWithInt:i+1];
            NSURL *fileUrl = [NSURL URLWithString:file.url];
          //save your video file url paired with the ImageView it belongs to.
           [self.videosFiles setobject:fileUrl forKey:tag];
// you only need to initialize the player once.
            if(self.avPlayer == nil){
                AVAsset *asset = [AVAsset assetWithURL:fileUrl];
                AVPlayerItem *item = [[AVPlayerItem alloc] initWithAsset:asset];
                self.avPlayer = [[AVPlayer alloc] initWithPlayerItem:item];
                self.avPlayer.actionAtItemEnd = AVPlayerActionAtItemEndNone;
                [[NSNotificationCenter defaultCenter] addobserver:self
                    selector:@selector(playerItemDidReachEnd:)
                name:AVPlayerItemDidplayToEndTimeNotification
                object:[self.avPlayer currentItem]];
            }
            // you don't need to keep the layer as a property 
            // (unless you need it for some reason 
            AVPlayerLayer* avPlayerLayer = [AVPlayerLayer playerLayerWithPlayer:self.avPlayer];
            avPlayerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;

            CGRect screenRect = [[UIScreen mainScreen] bounds];                
            avPlayerLayer.frame = CGRectMake(0,screenRect.size.height);
            [imageView.layer addSublayer:avPlayerLayer];
            NSLog(@"tag = %@",tag);                
            [self.videoCounterTags addobject:tag];

if ([self.videoCounterTags containsObject:gesture.view.tag]) { 

  NSLog(@"play video!!!");
    AVAsset *asset = [AVAsset assetWithURL:[self.videoFiles objectForKey:gesture.view.tag]];
    AVPlayerItem *item = [[AVPlayerItem alloc] initWithAsset:asset];
    self.avPlayer replaceCurrentItemWithPlayerItem: item];
    [self.avLayer play];
}

NSURL* fileURL = [self.videoFiles objectForKey:gesture.view.tag];
 if (fileURL!=nil) {    
     NSLog(@"play video!!!");
     AVAsset *asset = [AVAsset assetWithURL:fileURL];
     AVPlayerItem *item = [[AVPlayerItem alloc] initWithAsset:asset];
     self.avPlayer replaceCurrentItemWithPlayerItem: item];
     [self.avLayer play];
 }