導(dǎo)入蘋果的兩個(gè)框架是必不可少的環(huán)節(jié)。。。

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(gè)函數(shù)，必須在調(diào)用其他AudioSession?functions之前調(diào)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(rèn)的the?main?run?loop；(當(dāng)在監(jiān)聽(tīng)器回調(diào)的時(shí)候停止循環(huán))?

??????

?????inRunLoopMode?

?????The?mode?for?the?run?loop?that?the?interruption?listener?function?will?run?on.?Passing?NULL?is?equivalent?to?passing?kCFRunLoopDefaultMode（kCFRunLoopDefaultMode來(lái)持有對(duì)象，在應(yīng)用或線程閑置的時(shí)候這些對(duì)象被監(jiān)控）.?

?????(當(dāng)監(jiān)聽(tīng)器將要回調(diào)的時(shí)候運(yùn)行循環(huán)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(lái)代替?AudioSessionInterruptionListener（音頻會(huì)話被打斷）,當(dāng)我們拔下耳機(jī)的時(shí)候，音頻會(huì)話被打斷，從而使得應(yīng)用程序的音頻對(duì)象引起了回調(diào)。?

??????

?????inClientData?

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

?????*/??

??????

??????

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

}??

添加監(jiān)聽(tīng)事件和回調(diào)函數(shù)：

[cpp]?view plaincopy

//監(jiān)聽(tīng)耳機(jī)插入和拔出??

-?(BOOL)addHeadPhoneListener??

{??

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

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

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

????/*?

?????AudioSessionAddPropertyListener(?

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

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

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

?????)?

?????注冊(cè)一個(gè)監(jiān)聽(tīng)：audioRouteChangeListenerCallback，當(dāng)音頻會(huì)話傳遞的方式（耳機(jī)/喇叭）發(fā)生改變的時(shí)候，會(huì)觸發(fā)這個(gè)監(jiān)聽(tīng)?

?????kAudioSessionProperty_AudioRouteChange?：就是檢測(cè)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(jī)??Speaker?喇叭.??

}??

理解的不透徹，望各位大神指教。

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