導入蘋果的兩個框架是必不可少的環節。。。

代碼部分+小解：

[cpp]?view plaincopy

-?(void)viewDidLoad??

{??

????[super?viewDidLoad];??

????//?Do?any?additional?setup?after?loading?the?view,?typically?from?a?nib.??

????AudioSessionInitialize?(NULL,?NULL,?NULL,?NULL);??

????/*?

????????OSStatus?AudioSessionInitialize?(?

????????????CFRunLoopRef??????????????????????inRunLoop,?

????????????CFStringRef???????????????????????inRunLoopMode,?

????????????AudioSessionInterruptionListener??inInterruptionListener,?

????????????void??????????????????????????????*inClientData?

????????);?

?????這個函數，必須在調用其他AudioSession?functions之前調用?

??????

?????inRunLoop?

?????The?run?loop?that?the?interruption?listener?callback?should?be?run?on.?Pass?NULL?to?use?the?main?run?loop.?

?????置?NULL?，是使用默認的the?main?run?loop；(當在監聽器回調的時候停止循環)?

??????

?????inRunLoopMode?

?????The?mode?for?the?run?loop?that?the?interruption?listener?function?will?run?on.?Passing?NULL?is?equivalent?to?passing?kCFRunLoopDefaultMode（kCFRunLoopDefaultMode來持有對象，在應用或線程閑置的時候這些對象被監控）.?

?????(當監聽器將要回調的時候運行循環中斷)??NULL?==?kCFRunLoopDefaultMode,?

??????

?????inInterruptionListener?

?????The?interruption?listener?callback?function.?The?application’s?audio?session?object?invokes?the?callback?when?the?session?is?interrupted?and?(if?the?application?is?still?running)?when?the?interruption?ends.?Can?be?NULL.?See?AudioSessionInterruptionListener.?

?????用?NULL?來代替?AudioSessionInterruptionListener（音頻會話被打斷）,當我們拔下耳機的時候，音頻會話被打斷，從而使得應用程序的音頻對象引起了回調。?

??????

?????inClientData?

?????Data?that?you?would?like?to?be?passed?to?your?interruption?listener?callback.?

?????*/??

??????

??????

????[self?addHeadPhoneListener];??

}??

添加監聽事件和回調函數：

[cpp]?view plaincopy

//監聽耳機插入和拔出??

-?(BOOL)addHeadPhoneListener??

{??

????OSStatus?status?=?AudioSessionAddPropertyListener(??

??????????????????????????????????????????????????????kAudioSessionProperty_AudioRouteChange,??

??????????????????????????????????????????????????????audioRouteChangeListenerCallback,self);??

????/*?

?????AudioSessionAddPropertyListener(?

?????AudioSessionPropertyID??????????????inID,?

?????AudioSessionPropertyListener????????inProc,?

?????void????????????????????????????????*inClientData?

?????)?

?????注冊一個監聽：audioRouteChangeListenerCallback，當音頻會話傳遞的方式（耳機/喇叭）發生改變的時候，會觸發這個監聽?

?????kAudioSessionProperty_AudioRouteChange?：就是檢測音頻路線是否改變?

?????*/??

}??

void?audioRouteChangeListenerCallback?(??

???????????????????????????????????????void??????????????????????*inUserData,??

???????????????????????????????????????AudioSessionPropertyID????inPropertyID,??

???????????????????????????????????????UInt32????????????????????inPropertyValueS,??

???????????????????????????????????????const?void????????????????*inPropertyValue??

???????????????????????????????????????)?{??

????UInt32?propertySize?=?sizeof(CFStringRef);??

????AudioSessionInitialize(NULL,?NULL,?NULL,?NULL);??

????CFStringRef?state?=?nil;??

??????

????//獲取音頻路線??

????AudioSessionGetProperty(kAudioSessionProperty_AudioRoute??

????????????????????????????,&propertySize,&state);//kAudioSessionProperty_AudioRoute：音頻路線??

????NSLog(@"%@",(NSString?*)state);//Headphone?耳機??Speaker?喇叭.??

}??

理解的不透徹，望各位大神指教。

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