在iOS13中，MPMoviePlayerController已经被 DEPRECATED，系统提示：

MP_DEPRECATED("Use AVPlayerViewController in AVKit.", ios(2.0, 9.0))
MP_PROHIBITED(tvos, watchos)
@interface MPMoviePlayerController : NSObject <MPMediaPlayback>

网易云信IM附带提供的Demo中，视频播放功能貌似还没有进行过iOS13的适配，我找了一圈没有找见，也懒得再找了，反正中国的IT大厂写文档和组织文档的能力都比较差，对初学者非常不友好，继续找下去也许白白浪费更多的时间而且还没有结果。所以自己简单适配了一下，至少不会crash，并且能正常播放视频就行。

适配的代码也比较简单，本着练习表达能力的目的随便写一些说明吧：

网易IM Demo中，负责实现播放视频的类为：NTESVideoViewController，适配工作主要针对这个类进行；

下面是适配完成后的源代码，共涉及到以下文件：

• NETSVideoViewController.h
• NETSVideoViewController.m
• PlayerView.h
• PlayerView.m

NETSVideoViewController.h

下面是NETSVideoViewController.h的代码，其中有个BaseViewController是ViewController的基类，和具体的项目有关，不用太在意它。

#import <UIKit/UIKit.h>
//#import <MediaPlayer/MediaPlayer.h>
#import "BaseViewController.h"
#import <AVFoundation/AVFoundation.h>


@interface NTESVideoViewItem : NSObject

@property (nonatomic,copy) NSString *itemId;//message Id

@property (nonatomic,copy) NSString *path;

@property (nonatomic,copy) NSString *url;

@property (nonatomic,strong) NIMSession *session;

@end

@interface NTESVideoViewController : BaseViewController

- (instancetype)initWithVideoViewItem:(NTESVideoViewItem *)item;

//MPMoviePlayerController不再需要了,换成AVPlayer
//@property (nonatomic, readonly) MPMoviePlayerController *moviePlayer;

@property (nonatomic, readonly) AVPlayer *moviePlayer;

@end

NETSVideoViewController.m

这个.m文件中内容有点乱，本来想使用AVPlayerItem来实现本地视频文件的播放，但是调来调去就是搞不定，最后只好换成 [AVPlayer playerWithURL:]的方式来播放，可以正常播放；
所以，这个.m文件中，有第一些和AVPlayerItem相关的代码是没有用处的，仅用于回头再研究。

#import "NTESVideoViewController.h"
#import "UIView+Toast.h"
#import "Reachability.h"
#import "UIAlertView+NTESBlock.h"
#import "SVProgressHUD.h"
#import "NTESNavigationHandler.h"
#import "NTESMediaPreviewViewController.h"
#import "UIImage+imageWithColor.h"
#import "PlayerView.h"

@interface NTESVideoViewController () {
    BOOL _played;
}

@property (nonatomic,strong) NTESVideoViewItem *item;
@property (nonatomic ,strong) PlayerView *playerView;
@property (nonatomic ,strong) AVPlayerItem *playerItem;

@end

@implementation NTESVideoViewController
@synthesize moviePlayer = _moviePlayer;

- (instancetype)initWithVideoViewItem:(NTESVideoViewItem *)item
{
    self = [super initWithNibName:nil bundle:nil];
    if (self)
    {
        _item = item;
    }
    return self;
}

- (void)dealloc{
    
    [self.moviePlayer pause];
    
    [self.playerItem removeObserver:self forKeyPath:@"status" context:nil];
    [self.playerItem removeObserver:self forKeyPath:@"loadedTimeRanges" context:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:AVPlayerItemDidPlayToEndTimeNotification object:self.playerItem];
    
    
    [SVProgressHUD dismiss];
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    [[NIMSDK sharedSDK].resourceManager cancelTask:_item.path];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    self.edgesForExtendedLayout = UIRectEdgeAll;
    self.navigationItem.title = @"视频短片";
    if (self.item.session)
    {
        [self setupRightNavItem];
    }
    self.playerView.player = self.moviePlayer;
    // 添加视频播放结束通知
    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(moviePlayDidEnd:) name:AVPlayerItemDidPlayToEndTimeNotification object:_playerItem];
    
    if ([[NSFileManager defaultManager] fileExistsAtPath:self.item.path]) {
        [self startPlay];
    }else{
        __weak typeof(self) wself = self;
        [self downLoadVideo:^(NSError *error) {
            if (!error) {
                [wself startPlay];
            }else{
                [wself.view makeToast:@"下载失败，请检查网络"
                             duration:2
                             position:CSToastPositionCenter];
            }
        }];
    }
    
    //add by zhy
    [self configNavigationBar];
    
}

- (PlayerView *)playerView {
    if(!_playerView) {
        _playerView = [[PlayerView alloc] initWithFrame:WIN_FRAME];
        _playerView.backgroundColor = [UIColor blackColor];
        [self.view addSubview:_playerView];
    }
    return _playerView;
}


- (AVPlayerItem *)playerItem {
    if(!_playerItem) {
        ////self.item.path  http://vfx.mtime.cn/Video/2019/02/04/mp4/190204084208765161.mp4
        NSURL *videoUrl = [NSURL URLWithString:self.item.path];
        AVURLAsset *avset = [AVURLAsset assetWithURL:videoUrl];
        _playerItem = [AVPlayerItem playerItemWithAsset:avset];
        [_playerItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil];// 监听status属性
        [_playerItem addObserver:self forKeyPath:@"loadedTimeRanges" options:NSKeyValueObservingOptionNew context:nil];// 监听loadedTimeRanges属性
    }
    return _playerItem;
}

- (AVPlayer *)moviePlayer {
    if(!_moviePlayer) {
        _moviePlayer = [AVPlayer playerWithURL:[NSURL fileURLWithPath:self.item.path]];
//        _moviePlayer = [AVPlayer playerWithPlayerItem:self.playerItem];
    }
    return _moviePlayer;
}




- (void)configNavigationBar {
    [self removeSimulatorNavigationBarBgView];
    [self translucentNavigationBar:YES];
    [self setNavigationBarBgImg:nil];
    [self setBackBarButton];
    [self.navigationController.navigationBar setTitleTextAttributes: [NSDictionary dictionaryWithObjectsAndKeys:COLOR_THEME, NSForegroundColorAttributeName,[UIFont boldSystemFontOfSize:16],NSFontAttributeName, nil]];
}

- (void)setupRightNavItem
{
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button addTarget:self action:@selector(onMore:) forControlEvents:UIControlEventTouchUpInside];
    [button setImage:[UIImage imageNamed:@"icon_gallery_more_normal"] forState:UIControlStateNormal];
    [button setImage:[UIImage imageNamed:@"icon_gallery_more_pressed"] forState:UIControlStateHighlighted];
    [button sizeToFit];
    UIBarButtonItem *buttonItem = [[UIBarButtonItem alloc] initWithCustomView:button];
    self.navigationItem.rightBarButtonItem = buttonItem;
}


- (void)onMore:(id)sender
{
    NIMMessageSearchOption *option = [[NIMMessageSearchOption alloc] init];
    option.limit = 0;
    option.messageTypes = @[@(NIMMessageTypeImage),@(NIMMessageTypeVideo)];
    
    __weak typeof(self) weakSelf = self;
    [[NIMSDK sharedSDK].conversationManager searchMessages:self.item.session option:option result:^(NSError * _Nullable error, NSArray<NIMMessage *> * _Nullable messages) {
        if (weakSelf)
        {
            NSMutableArray *objects = [[NSMutableArray alloc] init];
            NTESMediaPreviewObject *focusObject;
            
            //显示的时候新的在前老的在后，逆序排列
            //如果需要微信的显示顺序，则直接将这段代码去掉即可
            NSArray *array = messages.reverseObjectEnumerator.allObjects;
            
            
            for (NIMMessage *message in array)
            {
                switch (message.messageType) {
                    case NIMMessageTypeVideo:{
                        NTESMediaPreviewObject *object = [weakSelf previewObjectByVideo:message.messageObject];
                        [objects addObject:object];
                        if ([message.messageId isEqualToString:weakSelf.item.itemId])
                        {
                            focusObject = object;
                        }
                        break;
                    }
                    case NIMMessageTypeImage:{
                        NTESMediaPreviewObject *object = [weakSelf previewObjectByImage:message.messageObject];
                        [objects addObject:object];
                        break;
                    }
                    default:
                        break;
                }
            }
            NTESMediaPreviewViewController *vc = [[NTESMediaPreviewViewController alloc] initWithPriviewObjects:objects focusObject:focusObject];
            [weakSelf.navigationController pushViewController:vc animated:YES];
        }
    }];
}

- (NTESMediaPreviewObject *)previewObjectByVideo:(NIMVideoObject *)object
{
    NTESMediaPreviewObject *previewObject = [[NTESMediaPreviewObject alloc] init];
    previewObject.objectId  = object.message.messageId;
    previewObject.thumbPath = object.coverPath;
    previewObject.thumbUrl  = object.coverUrl;
    previewObject.path      = object.path;
    previewObject.url       = object.url;
    previewObject.type      = NTESMediaPreviewTypeVideo;
    previewObject.timestamp = object.message.timestamp;
    previewObject.displayName = object.displayName;
    previewObject.duration  = object.duration;
    previewObject.imageSize = object.coverSize;
    return previewObject;
}

- (NTESMediaPreviewObject *)previewObjectByImage:(NIMImageObject *)object
{
    NTESMediaPreviewObject *previewObject = [[NTESMediaPreviewObject alloc] init];
    previewObject.objectId  = object.message.messageId;
    previewObject.thumbPath = object.thumbPath;
    previewObject.thumbUrl  = object.thumbUrl;
    previewObject.path      = object.path;
    previewObject.url       = object.url;
    previewObject.type      = NTESMediaPreviewTypeImage;
    previewObject.timestamp = object.message.timestamp;
    previewObject.displayName = object.displayName;
    previewObject.imageSize = object.size;
    return previewObject;
}



- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear: animated];
    if (![[self.navigationController viewControllers] containsObject: self])
    {
        [self topStatusUIHidden:NO];
    }
}


- (void)viewDidDisappear:(BOOL)animated{
    [super viewDidDisappear:animated];
    [self.moviePlayer pause];
}

- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear: animated];
    if(self.moviePlayer.status == AVPlayerStatusReadyToPlay) {
        [self topStatusUIHidden:YES];
    }else{
        [self topStatusUIHidden:NO];
    }
}



- (void)downLoadVideo:(void(^)(NSError *error))handler{
    [SVProgressHUD show];
    __weak typeof(self) wself = self;
    [[NIMSDK sharedSDK].resourceManager download:self.item.url filepath:self.item.path progress:^(float progress) {
        if (wself)
        {
            [SVProgressHUD showProgress:progress];
        }
    } completion:^(NSError *error) {
        if (wself) {
            [SVProgressHUD dismiss];
            if (handler) {
                handler(error);
            }
        }
    }];
}




- (void)startPlay{
    
    [self.playerView.player play];
    
    CGRect bounds = self.view.bounds;
    CGRect tapViewFrame = CGRectMake(0, 0, bounds.size.width, bounds.size.height);
    UIView *tapView = [[UIView alloc]initWithFrame:tapViewFrame];
    [tapView setAutoresizingMask:UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight];
    tapView.backgroundColor = [UIColor clearColor];
    [self.view addSubview:tapView];
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(onTap:)];
    [tapView  addGestureRecognizer:tap];
}



- (void)topStatusUIHidden:(BOOL)isHidden
{
    [[UIApplication sharedApplication] setStatusBarHidden:isHidden];
    self.navigationController.navigationBar.hidden = isHidden;
    NTESNavigationHandler *handler = (NTESNavigationHandler *)self.navigationController.delegate;
    handler.recognizer.enabled = !isHidden;
    
    if(isHidden) {
        [self setNavigationBarBgImg:nil];
    } else {
        [self setNavigationBarBgImg:[UIImage imageWithColor:[UIColor whiteColor]]];
    }
}


- (void)onTap: (UIGestureRecognizer *)recognizer {
    if (!_played) {
        [self.moviePlayer play];
        [self topStatusUIHidden:YES];
    } else {
        [self.moviePlayer pause];
        [self topStatusUIHidden:NO];
    }
    _played = !_played;
}


#pragma mark - kvo
// KVO方法
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    AVPlayerItem *playerItem = (AVPlayerItem *)object;
    if ([keyPath isEqualToString:@"status"]) {
        if ([playerItem status] == AVPlayerStatusReadyToPlay) {
            NSLog(@"AVPlayerStatusReadyToPlay");
            [self topStatusUIHidden:YES];
        } else if ([playerItem status] == AVPlayerStatusFailed) {
            NSLog(@"AVPlayerStatusFailed");
            [self topStatusUIHidden:NO];
        }
    } else if ([keyPath isEqualToString:@"loadedTimeRanges"]) {

    }
}

- (void)moviePlayDidEnd:(NSNotification *)notification {
    NSLog(@"Play end");
    [self topStatusUIHidden:NO];
}


@end


@implementation NTESVideoViewItem
@end

PlayerView.h

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>

@interface PlayerView : UIView

@property (nonatomic ,strong) AVPlayer *player;

@end

PlayerView.m

#import "PlayerView.h"

@implementation PlayerView

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }
    return self;
}

+ (Class)layerClass {
    return [AVPlayerLayer class];
}

- (AVPlayer *)player {
    return [(AVPlayerLayer *)[self layer] player];
}

- (void)setPlayer:(AVPlayer *)player {
    [(AVPlayerLayer *)[self layer] setPlayer:player];
}


@end