2 mapmapm MapMapM 于 2013.04.28 14:43 提问

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 correctly
if (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!

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