是否可以在后台使用Avplayer播放视频？ [英] Is it possible to play video using Avplayer in Background?

问题描述

我正在使用Avplayer来显示视频片段，当我回去（应用程序在后台）视频停止时。我怎样才能继续播放视频？

I am using Avplayer to show video clips and when i go back (app in background) video stop. How can i keep playing the video?

我搜索了后台任务&后台线程，在后台IOS只支持音乐表演（并非视频）
的 http://developer.apple.com/library/ios/#documentation/iphone/conceptual/iphoneosprogrammingguide/ManagingYourApplicationsFlow/ManagingYourApplicationsFlow.html

I have search about background task & background thread ,IOS only support music in background (Not video) http://developer.apple.com/library/ios/#documentation/iphone/conceptual/iphoneosprogrammingguide/ManagingYourApplicationsFlow/ManagingYourApplicationsFlow.html

这里关于在后台播放视频的一些讨论

here is some discussion about play video in background

1） https://discussions.apple.com/thread/2799090?start=0&tstart=0

2）http://www.cocoawithlove.com/2011/04/background-audio-through-ios-movie .html

但AppStore中有很多应用，可以在背景中播放视频

But there are many apps in AppStore, that play video in Background like

Swift Player： https://itunes.apple.com/us/app/swift-player-speed-up -video / id545216639？mt = 8& ign-mpt = uo％3D2

Swift Player : https://itunes.apple.com/us/app/swift-player-speed-up-video/id545216639?mt=8&ign-mpt=uo%3D2

SpeedUpTV： https://itunes.apple.com/ua/app/speeduptv/id386986953?mt=8

SpeedUpTV : https://itunes.apple.com/ua/app/speeduptv/id386986953?mt=8

推荐答案

此方法支持所有可能性：

This method supports all the possibilities:

• 用户锁定的屏幕;


• 列表项目


• 按下主页按钮;

只要你有一个运行iOS的AVPlayer实例就可以防止设备自动锁定。

As long as you have an instance of AVPlayer running iOS prevents auto lock of the device.

首先你需要配置应用程序来支持来自Info.plist的音频背景文件在UIBackgroundModes数组中添加音频元素。

First you need to configure the application to support audio background from the Info.plist file adding in the UIBackgroundModes array the audio element.

然后将你的AppDelegate.m放入

Then put in your AppDelegate.m into

- （BOOL）应用程序：（UIApplication *）application didFinishLaunchingWithOptions：（NSD ictionary *）launchOptions：

这些方法

[[AVAudioSession sharedInstance] setDelegate: self];    
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];

和 #import< AVFoundation / AVFoundation.h>

然后在控制AVPlayer的视图控制器中

Then in your view controller that controls AVPlayer

-(void)viewDidAppear:(BOOL)animated
{
  [super viewDidAppear:animated];
  [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
  [self becomeFirstResponder];
}

和

- (void)viewWillDisappear:(BOOL)animated
{
    [mPlayer pause];    
    [super viewWillDisappear:animated];
    [[UIApplication sharedApplication] endReceivingRemoteControlEvents];
    [self resignFirstResponder];
}

然后回复

 - (void)remoteControlReceivedWithEvent:(UIEvent *)event {
        switch (event.subtype) {
            case UIEventSubtypeRemoteControlTogglePlayPause:
                if([mPlayer rate] == 0){
                    [mPlayer play];
                } else {
                    [mPlayer pause];
                }
                break;
            case UIEventSubtypeRemoteControlPlay:
                [mPlayer play];
                break;
            case UIEventSubtypeRemoteControlPause:
                [mPlayer pause];
                break;
            default:
                break;
        }
    }

如果用户需要另一个技巧来恢复复制按下主页按钮（在这种情况下，复制暂停淡出）。

Another trick is needed to resume the reproduction if the user presses the home button (in which case the reproduction is suspended with a fade out).

当你控制视频的再现时（我有播放方法）设置

When you control the reproduction of the video (I have play methods) set

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationDidEnterBackground:) name:UIApplicationDidEnterBackgroundNotification object:nil];

以及将启动计时器并恢复复制的相应方法。

and the corresponding method to be invoked that will launch a timer and resume the reproduction.

- (void)applicationDidEnterBackground:(NSNotification *)notification
{
    [mPlayer performSelector:@selector(play) withObject:nil afterDelay:0.01];
}

它适用于我在Backgorund中播放视频。
感谢所有。

Its works for me to play video in Backgorund. Thanks to all.

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