Schalt-Videos in AVPlayer Erzeugt Flash Beim Wechsel

Gibt es zwei workaround den ich gefunden habe. Für mich beide Ansätze gearbeitet, und ich bevorzuge die zweite.

Erstens, wie @Alex Kennberg erwähnt, erstellen Sie zwei Satz AVPlayerLayer und AVPlayer. und schalten Sie beim wechseln zwischen videos. Stellen Sie die Hintergrundfarbe auf Farbe "clear".

Zweite, verwenden Sie UIImageView als Eigentümer Blick auf den AVPlayerLayer. Erstellen Sie thumbnail-Bild von einem video und legen Sie es auf die Bildansicht vor der Umschaltung des video. Werden Sie sicher, dass Sie die view-Modus richtig.

Nach zu vielen versuchen ohne Erfolg habe ich endlich eine Lösung gefunden, nicht die beste, aber funktioniert

Mein Eintrag code ist unten, haben Sie einen Blick auf die loadVideo Methode

#import "ViewController.h"
#import <AVKit/AVKit.h>

@interface ViewController ()<UIGestureRecognizerDelegate>
@property (nonatomic, strong) NSArray *videos;
@property (nonatomic, assign) NSInteger videoIndex;
@property (nonatomic, strong) AVPlayer *player;
@property (nonatomic, strong) AVPlayerLayer *playerLayer;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor blackColor];
    self.videos = @[@"1.mp4", @"2.mp4", @"3.mp4", @"4.mp4", @"5.mp4", @"6.mp4"];
    self.videoIndex = 0;
    [self loadVideo];
    [self configureGestures:self.view]; //changes video on swipe

}

-(void)prevZoomPanel{
    if(self.videoIndex <= 0){
        NSLog(@"cant go prev");
        return;
    }
    self.videoIndex -= 1;
    [self loadVideo];
}

-(void)nextZoomPanel{
    if(self.videoIndex >= self.videos.count - 1){
        NSLog(@"cant go next");
        return;
    }
    self.videoIndex += 1;
    [self loadVideo];
}

#pragma mark - Load Video
-(void)loadVideo{
    NSURL * bundle = [[NSBundle mainBundle] bundleURL];
    NSURL * file = [NSURL URLWithString:self.videos[self.videoIndex] relativeToURL:bundle];
    NSURL * absoluteFile = [file absoluteURL];
    AVPlayerItem *item = [AVPlayerItem playerItemWithURL:absoluteFile];

    //*************
    //DO NOT USE '[self.player replaceCurrentItemWithPlayerItem:item]', it flashes, instead, initialize the instace again.
    //Why is replaceCurrentItemWithPlayerItem flashing but playerWithPlayerItem is NOT?
    //if you want to see the diferente, uncomment the code above
    self.player = [AVPlayer playerWithPlayerItem:item];
//   if (self.player == nil) {
//       self.player = [AVPlayer playerWithPlayerItem:item];
//   }else{
//       [self.player replaceCurrentItemWithPlayerItem:item];
//   }



    //*************
    //create an instance of AVPlayerLayer and add it on self.view
    //afraid of this
    AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:self.player];
    playerLayer.videoGravity = AVLayerVideoGravityResizeAspect;
    playerLayer.frame = self.view.layer.bounds;
    [self.view.layer addSublayer:playerLayer];

    //*************
    //play the video before remove the old AVPlayerLayer instance, at this time will have 2 sublayers
    [self.player play];


    NSLog(@"sublayers before: %zd", self.view.layer.sublayers.count);


    //*************
    //remove all sublayers after 0.09s, to avoid the flash, 0.08 still flashing.
    //TODO: tested on iPhone X, need to test on slower iPhones to check if the time is enough.
    //Why do I need to wait to remove? Is that safe? What if I swipe a lot too fast, faster than 0.09s ?
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.09 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

        NSArray* sublayers = [NSArray arrayWithArray:self.view.layer.sublayers];
        NSInteger idx = 0;

        for (CALayer *layer in sublayers) {

            if (idx < self.view.layer.sublayers.count && self.view.layer.sublayers.count > 1) {

                //to avoid memory crash, need to remove all sublayer but keep the top one.
                [layer removeFromSuperlayer];
            }
            idx += 1;
        }

        NSLog(@"sublayers after: %zd", self.view.layer.sublayers.count);
    });



    //*************
    //the code bellow is the same of the above, but with no delay
    //uncomment the code bellow AND comment the code above to test
//   NSArray* sublayers = [NSArray arrayWithArray:self.view.layer.sublayers];
//   NSInteger idx = 0;
//
//   for (CALayer *layer in sublayers) {
//
//       if (idx < self.view.layer.sublayers.count && self.view.layer.sublayers.count > 1) {
//
//           //to avoid memory crash, need to remove all sublayer but keep the top one.
//           [layer removeFromSuperlayer];
//       }
//       idx += 1;
//   }



    //*************
    //App's memory usage is about 14MB constantly, didn't increase on videos change.
    //TODO: need to test with more than 100 heavy videos.

}




-(void)configureGestures:(UIView *)view{
    UISwipeGestureRecognizer *right = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(userDidSwipeScreen:)];
    right.direction = UISwipeGestureRecognizerDirectionRight;
    right.delegate = self;
    [view addGestureRecognizer:right];
    UISwipeGestureRecognizer *left = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(userDidSwipeScreen:)];
    left.direction = UISwipeGestureRecognizerDirectionLeft;
    left.delegate = self;
    [view addGestureRecognizer:left];
}

- (void)userDidSwipeScreen:(UISwipeGestureRecognizer *)swipeGestureRecognizer{
    switch (swipeGestureRecognizer.direction) {
        case UISwipeGestureRecognizerDirectionLeft: [self nextZoomPanel];break;
        case UISwipeGestureRecognizerDirectionRight:[self prevZoomPanel];break;
        default: break;
    }
}

@end