iOS開發之AVKit框架使用

iOS開發之AVKit框架使用

1、引言

    在iOS開發框架中，AVKit是一個很是上層，偏應用的框架，它是基於AVFoundation的一層視圖層封裝。其中相關文件和類都十分簡單，本篇博客主要整理和總結AVKit中相關類的使用方法。

2、AVRoutePickerView

    AVRoutePickerView是iOS 11後新加入的類，AirPlay是iOS設備方便用戶使用的一大特色。其做用是將當前手機播放的音頻或者視頻投送到其餘外部設備上，例如支持AirPlay的電視，車載設備等。AVRoutePickerView只是一個按鈕，其用來方便用戶能夠直接在應用程序內喚出AirPlay選擇窗口。示例以下：

- (void)viewDidLoad {
    [super viewDidLoad];
    AVRoutePickerView * view = [[AVRoutePickerView alloc]initWithFrame:CGRectMake(100, 100, 60, 60)];
    //活躍狀態顏色
    view.activeTintColor = [UIColor redColor];
    //設置代理
    view.delegate = self;
    [self.view addSubview:view];
}
//AirPlay界面彈出時回調
- (void)routePickerViewWillBeginPresentingRoutes:(AVRoutePickerView *)routePickerView{
    NSLog(@"!!!!!!!!");
}
//AirPlay界面結束時回調
- (void)routePickerViewDidEndPresentingRoutes:(AVRoutePickerView *)routePickerView{
    NSLog(@"@@@@@@@@");
}

按鈕和彈出界面效果以下：

從上面的示例代碼也能夠看出，對於AVRoutePickerView，咱們基本沒有任何能夠進行自定義的餘地，從UI效果到按鈕的觸發方法所有由AVKit封裝好了，它只是一個喚出系統功能的接口。

3、AVPlayerViewController

    AVPlayerViewController是對AVFoundation中的AVPlayer與AVPlayerLayer的封裝，它是一個封裝好的視圖控制器，包含了視頻的播放和控制功能。這個類在iOS8以後可用，解析以下：

@interface AVPlayerViewController : UIViewController
//視頻播放器對象
@property (nonatomic, strong, nullable) AVPlayer *player;
//是否顯示視頻播放控制組件
@property (nonatomic) BOOL showsPlaybackControls;
//設置視頻的填充方式
/*
//按比例縮放
AVF_EXPORT AVLayerVideoGravity const AVLayerVideoGravityResizeAspect NS_AVAILABLE(10_7, 4_0);
//按比例填充
AVF_EXPORT AVLayerVideoGravity const AVLayerVideoGravityResizeAspectFill NS_AVAILABLE(10_7, 4_0);
//充滿
AVF_EXPORT AVLayerVideoGravity const AVLayerVideoGravityResize NS_AVAILABLE(10_7, 4_0);
*/
@property (nonatomic, copy) AVLayerVideoGravity videoGravity;
//視頻的第一幀是否已經準備好了
@property (nonatomic, readonly, getter = isReadyForDisplay) BOOL readyForDisplay;
//獲取視頻的尺寸
@property (nonatomic, readonly) CGRect videoBounds;
//內容覆蓋層 能夠向其上添加子視圖 會出如今視頻層與控制層之間
@property (nonatomic, readonly, nullable) UIView *contentOverlayView;
//是否容許畫中畫  iOS9以上可用 ipad可用
@property (nonatomic) BOOL allowsPictureInPicturePlayback API_AVAILABLE(ios(9.0));
//是否對信息中心的播放器信息進行更新 默認爲YES
@property (nonatomic) BOOL updatesNowPlayingInfoCenter API_AVAILABLE(ios(10.0));
//是否默認進行全屏播放
@property (nonatomic) BOOL entersFullScreenWhenPlaybackBegins API_AVAILABLE(ios(11.0));
//播放結束後 是否默認退出全屏
@property (nonatomic) BOOL exitsFullScreenWhenPlaybackEnds API_AVAILABLE(ios(11.0));
//代理
@property (nonatomic, weak, nullable) id <AVPlayerViewControllerDelegate> delegate API_AVAILABLE(ios(9.0));
@end

AVPlayerViewControllerDelegate解析以下：

//將要開始畫中畫時調用
- (void)playerViewControllerWillStartPictureInPicture:(AVPlayerViewController *)playerViewController;
//已經開始畫中畫時調用
- (void)playerViewControllerDidStartPictureInPicture:(AVPlayerViewController *)playerViewController;
//開啓畫中畫失敗調用
- (void)playerViewController:(AVPlayerViewController *)playerViewController failedToStartPictureInPictureWithError:(NSError *)error;
//將要結束畫中畫調用
- (void)playerViewControllerWillStopPictureInPicture:(AVPlayerViewController *)playerViewController;
//已經結束畫中畫調用
- (void)playerViewControllerDidStopPictureInPicture:(AVPlayerViewController *)playerViewController;
//是否自動關閉控制器當畫中畫開始時
- (BOOL)playerViewControllerShouldAutomaticallyDismissAtPictureInPictureStart:(AVPlayerViewController *)playerViewController;
//畫中畫結束後回覆以前的用戶界面
- (void)playerViewController:(AVPlayerViewController *)playerViewController restoreUserInterfaceForPictureInPictureStopWithCompletionHandler:(void (^)(BOOL restored))completionHandler;

4、AVPictureInPictureController

      AVPictureInPictureController是一個控制器，用來對畫中畫進行相關操做，解析以下：

@interface AVPictureInPictureController : NSObject
//獲取當前設備是否支持畫中畫
+ (BOOL)isPictureInPictureSupported;
//畫中畫轉換開始按鈕圖像
+ (UIImage *)pictureInPictureButtonStartImageCompatibleWithTraitCollection:(nullable UITraitCollection *)traitCollection;
//畫中畫轉換結束按鈕圖像
+ (UIImage *)pictureInPictureButtonStopImageCompatibleWithTraitCollection:(nullable UITraitCollection *)traitCollection;
//構造方法
- (nullable instancetype)initWithPlayerLayer:(AVPlayerLayer *)playerLayer;
//播放器視圖
@property (nonatomic, readonly) AVPlayerLayer *playerLayer;
//代理
@property (nonatomic, weak, nullable) id <AVPictureInPictureControllerDelegate> delegate;
//開始畫中畫
- (void)startPictureInPicture;
//結束畫中畫
- (void)stopPictureInPicture;
//畫中畫目前是否可用
@property (nonatomic, readonly, getter = isPictureInPicturePossible) BOOL pictureInPicturePossible;
//畫中畫是否激活
@property (nonatomic, readonly, getter = isPictureInPictureActive) BOOL pictureInPictureActive;
//是否支持畫中畫
@property (nonatomic, readonly, getter = isPictureInPictureSuspended) BOOL pictureInPictureSuspended;