我有多个 imageview subview 根据我的传入数据堆叠起来。基本上所有这些 subview 都根据我的传入数据设置为图像或视频层。我遇到的问题是播放视频。我可以播放堆栈中的第一个视频，但之后的每个视频都只是第一个视频的声音。我怎样才能相应地发挥每一个？
View 是通过像 snapchat 这样的点击事件来导航的。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, 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, 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);
}
最佳答案
Brooks Hanes 所说的是正确的，您一直在覆盖 avplayer。 这是我建议你做的:
将点击手势添加到 imageView 而不是屏幕(或者为了更简洁的方法，使用
UIButton代替):UIImageView *imageView =[[UIImageView alloc] initWithFrame:CGRectMake(0, 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); UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:imageView action:@selector(viewTapped:)]; [imageView addGestureRecognizer:tapGesture];
这样，在您的 viewTapped: 方法中，您可以像这样获取按下图像的标签:gesture.view.tag 而不是使用 myCounter。
- 要使视频正常运行，您可以为每个视频创建一个新的
AVPlayer，但这可能会占用大量内存。更好的方法是使用AVPlayerItem并在更改视频时切换AVPlayer的AVPlayerItem。
所以在 for 循环中做这样的事情，其中 self.videoFiles 是一个 NSMutableDictionary 属性:
// 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, 0, screenRect.size.width, screenRect.size.height);
[imageView.layer addSublayer:avPlayerLayer];
NSLog(@"tag = %@", tag);
[self.videoCounterTags addObject:tag];
现在在您的 viewTapped 中:
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];
}
或者改用 self.videoFiles 然后你就不需要 self.videoCounterTags 了:
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];
}
这就是它的要点。
关于ios - 播放堆叠视频，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33978395/