因此,我有一个应用程序,播放一串歌曲,而用户可以翻阅漫画书。我使用AVAudioPlayer,并且设置了按照设定的顺序播放歌曲。所以当一首歌完成时,下一首将会播放。当应用程序打开时,此功能完美无瑕。当应用程序在后台时发生问题。我将应用程序设置为在后台播放,而且工作正常。所以当用户按下主屏幕时,音乐继续播放。问题发生在歌曲结束时,它应该像打开应用时播放下一首歌一样。相反没有任何反应根据我的NSLog语句正确的方法被调用,但没有任何反应。这是我的代码:iOS - AVAudioPlayer不会在后台继续播放下一首歌曲
- (void)audioPlayerDidFinishPlaying: (AVAudioPlayer *)player successfully: (BOOL) flag {
NSLog(@"Song finished");
if ([songSelect isEqualToString: @"01icecapades"]) {
isPlay = @"yes";
songSelect = @"02sugarcube";
imageSelect = @"playbanner02";
[self performSelector:@selector(triggerSong) withObject:nil afterDelay:0];
[self performSelector:@selector(triggerBanner) withObject:nil afterDelay:0];
}
else if ([songSelect isEqualToString: @"02sugarcube"]) {
isPlay = @"yes";
songSelect = @"03bullets";
imageSelect = @"playbanner03";
[self performSelector:@selector(triggerSong) withObject:nil afterDelay:0];
[self performSelector:@selector(triggerBanner) withObject:nil afterDelay:0];
}
else if ([songSelect isEqualToString: @"03bullets"]) {
isPlay = @"yes";
songSelect = @"04satanama";
imageSelect = @"playbanner04";
[self performSelector:@selector(triggerSong) withObject:nil afterDelay:0];
[self performSelector:@selector(triggerBanner) withObject:nil afterDelay:0];
}
else if ([songSelect isEqualToString: @"04satanama"]) {
isPlay = @"yes";
songSelect = @"05uglyjoke";
imageSelect = @"playbanner05";
[self performSelector:@selector(triggerSong) withObject:nil afterDelay:0];
[self performSelector:@selector(triggerBanner) withObject:nil afterDelay:0];
}
else if ([songSelect isEqualToString: @"05uglyjoke"]) {
isPlay = @"yes";
songSelect = @"01icecapades";
imageSelect = @"playbanner01";
[self performSelector:@selector(triggerSong) withObject:nil afterDelay:0];
[self performSelector:@selector(triggerBanner) withObject:nil afterDelay:0];
}}
上面是识别哪首歌正在播放,然后设置正确的歌曲的代码。然后触发另一种设置播放器的方法。
- (void)triggerSong {
NSLog(@"triggerSong called");
NSString *path;
NSError *error;
// Path the audio file
path = [[NSBundle mainBundle] pathForResource:songSelect ofType:@"mp3"];
// If we can access the file...
if ([[NSFileManager defaultManager] fileExistsAtPath:path])
{
// Setup the player
player = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:&error];
//player = [initWithContentsOfURL:[NSURL fileURLWithPath:path] error:&error];
[player setDelegate: self];
// Set the volume (range is 0 to 1)
player.volume = 1.0f;
[player prepareToPlay];
[player setNumberOfLoops:0];
[player play];
NSLog(@"player play");
[error release];
player.delegate = self;
// schedules an action every second for countdown
[NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(updateTimeLeft) userInfo:nil repeats:YES];
}}
现在我假设这不是最好的方式来做到这一点,但它应用程序处于前景状态时效果很好。我一直在查看文档,我似乎无法找到造成这个问题的原因。我希望有人能够看到我的方法有错误。就像我之前说过的,triggerSong方法中的两个NSLogs被调用,所以我不明白为什么AVAudioPlayer(播放器)没有被调用。
我也有我的info.plist正确的设置,我有这个在我viewDidLoad中:
//Make sure the system follows our playback status
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
[[AVAudioSession sharedInstance] setActive: YES error: nil];
感谢任何见解。非常感激。
你是最棒的!非常感谢。它工作完美。 – 2012-03-16 02:40:36
没问题!祝你好运。 – Squatch 2012-03-16 12:23:46
FYI ..你的链接是错误的...它应该是https://devforums.apple.com/message/264397 – 2013-12-02 06:00:05