1.開啟后臺模式

image.png

2.導(dǎo)入框架#import <AVKit/AVKit.h> 創(chuàng)建AVPictureInPictureController
注：如果是使用系統(tǒng)播放器AVPlayerViewController，設(shè)置allowsPictureInPicturePlayback = YES即可

//1.判斷是否支持畫中畫功能
if ([AVPictureInPictureController isPictureInPictureSupported]) {
    //2.開啟權(quán)限
    @try {
        NSError *error = nil;
        [[AVAudioSession sharedInstance] setCategory:AVAudioSessionOrientationBack error:&error];
        [[AVAudioSession sharedInstance] setActive:YES error:&error];
    } @catch (NSException *exception) {
        NSLog(@"AVAudioSession發(fā)生錯誤");
    }
    self.pipVC = [[AVPictureInPictureController alloc] initWithPlayerLayer:self.player];
    self.pipVC.delegate = self;
}

3.開啟或關(guān)閉畫中畫

if (self.pipVC.isPictureInPictureActive) {
    [self.pipVC stopPictureInPicture];
} else {
    [self.pipVC startPictureInPicture];
}

4.代理 AVPictureInPictureControllerDelegate

// 即將開啟畫中畫
- (void)pictureInPictureControllerWillStartPictureInPicture:(AVPictureInPictureController *)pictureInPictureController;
// 已經(jīng)開啟畫中畫
- (void)pictureInPictureControllerDidStartPictureInPicture:(AVPictureInPictureController *)pictureInPictureController;
// 開啟畫中畫失敗
- (void)pictureInPictureController:(AVPictureInPictureController *)pictureInPictureController failedToStartPictureInPictureWithError:(NSError *)error;
// 即將關(guān)閉畫中畫
- (void)pictureInPictureControllerWillStopPictureInPicture:(AVPictureInPictureController *)pictureInPictureController;
// 已經(jīng)關(guān)閉畫中畫
- (void)pictureInPictureControllerDidStopPictureInPicture:(AVPictureInPictureController *)pictureInPictureController;
// 關(guān)閉畫中畫且恢復(fù)播放界面
- (void)pictureInPictureController:(AVPictureInPictureController *)pictureInPictureController restoreUserInterfaceForPictureInPictureStopWithCompletionHandler:(void (^)(BOOL restored))completionHandler;

值得注意的是，關(guān)閉畫中畫會執(zhí)行
pictureInPictureController:restoreUserInterfaceForPictureInPictureStopWithCompletionHandler: 這個代理方法，用來恢復(fù)播放界面的

全局畫中畫注意點

1. 通過一個全局變量持有畫中畫控制器，可以在pictureInPictureControllerWillStartPictureInPicture持有，pictureInPictureControllerDidStopPictureInPicture釋放；
2. 有可能不是點畫中畫按鈕，而是從其它途徑來打開當(dāng)前畫中畫控制器，可以在viewWillAppear 進行判斷并關(guān)閉；
3. 已有畫中畫的情況下開啟新的畫中畫，需要等完全關(guān)閉完再開啟新的，防止有未知的錯誤出現(xiàn)，因為關(guān)閉畫中畫是有過程的；
4. 如果創(chuàng)建AVPictureInPictureController并同時開啟畫中畫功能，有可能會失效，出現(xiàn)這種情況延遲開啟畫中畫功能即可。