的ObjectiveC AVAudioPlayer量爲0

我見過有關AVAudioPlayer但諾內斯相當多的職位幫助：我不能播放聲音了（即使它用於升級到8.3.2之前的Xcode工作）的ObjectiveC AVAudioPlayer量爲0

這裏是我的代碼：

AVAudioPlayer *audioPlayerObj; 
AVAudioSession *session; 
[...] 
- (IBAction)playSound:(id)sender { 
audioPlayerObj.delegate = self; 

if(playButton.isSelected){   
    playButton.selected=NO; 
    (void) [audioPlayerObj stop]; 
} 
else{ 
    session = nil; 
    {NSError * _error; 

     session = [AVAudioSession sharedInstance]; 
     [session setCategory:AVAudioSessionCategoryPlayback 
         error:&_error]; 
     [session setActive:YES error:&_error]; 
     if(_error !=nil) 
     { NSLog(@"could not init the audio player session %@ ", _error); 
     } 

    } 

    NSString * tune =[NSString stringWithFormat:@"%@.wav",[pickerViewArray objectAtIndex:[pickerView selectedRowInComponent:0]]]; 
    NSString *path =[[NSBundle mainBundle] pathForResource:tune ofType:@""]; 

    NSURL * actualFilePath= [NSURL fileURLWithPath:path]; 
NSError *error; 

(void)[audioPlayerObj initWithContentsOfURL:actualFilePath error:&error]; 

    [audioPlayerObj prepareToPlay]; 


    if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"8.0")) 
    { 
    [audioPlayerObj setVolume:0.99 fadeDuration: 1]; 

    } 
    NSLog(@"syst volume : %f", [session outputVolume]); 
    NSLog(@"vol : %f\n",[audioPlayerObj volume]); 

if(error !=nil) 
{ NSLog(@"could not init the audio player %@ ", error); 
    audioPlayerObj=nil; 

} 
else 
{ 
    (void) [audioPlayerObj setNumberOfLoops:-1 ]; 
    (void) [audioPlayerObj play]; 
    NSLog(@"playing with vol : %f\n",[audioPlayerObj volume]); 
    [audioPlayerObj setVolume:0.99 fadeDuration: 1]; 
    playButton.selected=YES; 
} 
}

輸出是 syst volume : 0.476119 vol : 0.000000 playing with vol : 0.000000 關於如何提高該卷的任何暗示，將不勝感激。該視圖還有一個MPVolumeView，但其上的任何操作只會改變系統音量。

來源

2017-06-06 toto

試試這個'AVAudioSession * audioSession = [AVAudioSession sharedInstance] [audioSession setCategory：AVAudioSessionCategoryPlayback error：nil];' –

@pawan：上面的發佈代碼已經設置了AVaudiosession，我很樂意嘗試你的建議，但它在哪裏改變了一些東西？ – toto

的錯誤是在這裏：

(void)[audioPlayerObj initWithContentsOfURL:actualFilePath error:&error];

應該是：

audioPlayerObj = [[AVAudioPlayer alloc] initWithContentsOfURL:actualFilePath error:&error];

來源

2017-06-08 20:47:34 toto

的ObjectiveC AVAudioPlayer量爲0

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