如何停止播放聲音，如果靜音模式開啓時

Question

我的代碼：

NSString *soundName = [[NSBundle mainBundle] pathForResource:@"music" ofType:@"mp3"]; 
NSURL *soundURL = [NSURL fileURLWithPath:soundName]; 
NSError *error = [[NSError alloc] init]; 
self.backgroundPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:soundURL error:&error]; 

if (self.backgroundPlayer == nil) { 
    NSLog(@"error = %@",[error description]); 
} else { 
    [self.backgroundPlayer setDelegate:self]; 
    [self.backgroundPlayer setNumberOfLoops:HUGE_VAL]; 
    [self.backgroundPlayer setVolume:0.5f]; 
    [self.backgroundPlayer prepareToPlay]; 
    if ([self.backgroundPlayer prepareToPlay]) { 
     if ([self.backgroundPlayer play]) { 
      NSLog(@"playing"); 
     } 
    } else { 
     NSLog(@"error!"); 
    } 
} 

當我切換iPhone到靜音模式的聲音仍然起着。我怎麼解決這個問題？

Answer 1

您需要用戶AVAudioSessionCategoryAmbient音頻會議。去audio session programming guide。

Answer 2

我還沒有嘗試過，但你可以在播放文件之前設置音頻類別：

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategorySoloAmbient error:nil]; 

Answer 3

CFStringRef state; 

UInt32 propertySize = sizeof(CFStringRef); 

AudioSessionInitialize(NULL, NULL, NULL, NULL); 
AudioSessionGetProperty(kAudioSessionProperty_AudioRoute, &propertySize, &state); 
if(CFStringGetLength(state) == 0) 
{ 
//SI 

    else 
    { 
    //NOT SILENT 

    } 

可以檢測手機的狀態，並停止播放.. :)