iphone - Resume AVPlayer video playback after app become active -


i write custom player avplayer video playback. according apple docs set video layer: 

    self.player = [iplplayer new];     self.player.playerlayer = (avplayerlayer *)self.playerview.layer;

where self.playerview usual class docs: 

    @implementation playerview  + (class) layerclass {     return [avplayerlayer class]; }  - (avplayer *)player {     return [(avplayerlayer *)[self layer] player]; }  - (void)setplayer:(avplayer *) player {     [(avplayerlayer *) [self layer] setplayer:player]; }

the problem is: when close app (home button), or block screen, video playback stopped, , when resume audio playback resumed, image on screen still before block screen - it's static , note change frames.

how resume video playing after screen blocked?

seems must register notifications, , after app become active resume video layer:

    -(void)registernotification {     [[nsnotificationcenter defaultcenter] addobserver:self                                              selector:@selector(willenterbackground)                                                  name:uiapplicationwillresignactivenotification object:nil];     [[nsnotificationcenter defaultcenter] addobserver:self                                              selector:@selector(didenterforeground)                                                  name:uiapplicationdidbecomeactivenotification object:nil]; }  -(void)unregisternotification {     [[nsnotificationcenter defaultcenter] removeobserver:self]; }   -(void)willenterbackground {     nslog(@"willenterbackground");     [self.playerview willenterbackground]; }  -(void)didenterforeground {     nslog(@"didenterforeground");     [self.playerview didenterforeground]; }

and 1 solution binds information together.

maybe player status should handled differently, recursive way.

note: if not need exact seek time, can use [_player seektotime:<#(cmtime)#> completionhandler:<#^(bool finished)completionhandler#>] it's faster seeks nearest key frame.

- (void)viewdidload {     [super viewdidload];  ....      [[nsnotificationcenter defaultcenter] addobserver:self selector:@selector(appenteredforeground) name:uiapplicationwillenterforegroundnotification object:nil];     [[nsnotificationcenter defaultcenter] addobserver:self selector:@selector(appenteredbackground) name:uiapplicationdidenterbackgroundnotification object:nil]; }  -(void)viewwilldisappear:(bool)animated {     [[nsnotificationcenter defaultcenter] removeobserver:self name:uiapplicationwillenterforegroundnotification object:nil];     [[nsnotificationcenter defaultcenter] removeobserver:self name:uiapplicationdidenterbackgroundnotification object:nil]; }  ....  -(void) appenteredforeground {     avplayerlayer *player = (avplayerlayer *)[playerview layer];     [player setplayer:null];     [player setplayer:_player];     [self playat:currenttime]; }  -(void) appenteredbackground {     [_player pause];     currenttime = [_player currenttime]; }  -(void)playat: (cmtime)time {     if(_player.status == avplayerstatusreadytoplay && _player.currentitem.status == avplayeritemstatusreadytoplay) {         [_player seektotime:time tolerancebefore:kcmtimezero toleranceafter:kcmtimezero completionhandler:^(bool finished) {             [_player play];         }];     } else {         dispatch_after(dispatch_time(dispatch_time_now, (int64_t)(0.2 * nsec_per_sec)), dispatch_get_main_queue(), ^{             [self playat:time];         });     } }

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