问题描述

应用无法播放背景音频

需要应用能实现在隐藏后播放音频的效果。在按下home键后也能继续播放。

下面的代码只能在home键按两下后进行一些远程控制，背景中播放音频就不行。，我需要的是在应用隐藏背景模式下播放MP3格式的文件。

在info.plist文件中添加了选项。
需要处于背景模式的应用能播放音频。

- (void) setupAudioSession {    AVAudioSession *audioSession = [AVAudioSession sharedInstance];     // Specify that this object is the delegate of the audio session so that this object's endInterruption method will be invoked when needed.   [audioSession setDelegate: self];    // Assign the Playback category to the audio session.    NSError *audioSessionError = nil;    //[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];    [audioSession setCategory: AVAudioSessionCategoryPlayback error: &audioSessionError];    if (audioSessionError != nil) {        NSLog (@""Error setting audio session category."");    return;}    // Activate the audio session[audioSession setActive: YES  error: &audioSessionError];if (audioSessionError != nil) {    NSLog (@""Error activating audio session during initial setup."");    return;}}    - (void)viewDidAppear:(BOOL)animated {[super viewDidAppear:animated];[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];[self becomeFirstResponder]; }    - (void)viewWillDisappear:(BOOL)animated {[super viewWillDisappear:animated];[[UIApplication sharedApplication] endReceivingRemoteControlEvents];[self resignFirstResponder]; }    - (BOOL)canBecomeFirstResponder {return YES; }    - (void)remoteControlReceivedWithEvent:(UIEvent *)event {//if it is a remote control event handle it correctlyif (event.type == UIEventTypeRemoteControl) {    if (event.subtype == UIEventSubtypeRemoteControlTogglePlayPause) {        //[player play];        [self playAction];   // } else if (event.subtype == UIEventSubtypeRemoteControlPause) {    //    [player pause];    }  else if (event.subtype == UIEventSubtypeRemoteControlPreviousTrack) {        [self rewButtonPressed];    } else if (event.subtype == UIEventSubtypeRemoteControlNextTrack)        [self ffwButtonPressed:nil];}}

请高手指教一些，非常感谢！