检测耳机是否插入iPhone

http://developer.apple.com/iphone/library/samplecode/SpeakHere/Introduction/Intro.html

在这个项目中有一个代码片段,如果耳机被拔下,它会暂停录制。也许你可以用它来达到你的目的。

祝你好运!

(编辑)

你得研究一下这个问题扬声器控制器.mm文件。
我在文件里找到了这个代码 awakeFromNib

// we do not want to allow recording if input is not available
error = AudioSessionGetProperty(kAudioSessionProperty_AudioInputAvailable, &size, &inputAvailable);
if (error) printf("ERROR GETTING INPUT AVAILABILITY! %d\n", error);
btn_record.enabled = (inputAvailable) ? YES : NO;

// we also need to listen to see if input availability changes
error = AudioSessionAddPropertyListener(kAudioSessionProperty_AudioInputAvailable, propListener, self);
if (error) printf("ERROR ADDING AUDIO SESSION PROP LISTENER! %d\n", error);

使用此代码,您可以检测以下各项之间的更改:

• 排版
• 演讲者

Detecting when an iOS Device connector was plugged/unplugged

注意:由于“audioRouteChangeListenerCallback(…)”行为的iOS 5部分已被弃用,但您可以使用以下内容进行更新:

// kAudioSession_AudioRouteChangeKey_PreviousRouteDescription -> Previous route
// kAudioSession_AudioRouteChangeKey_CurrentRouteDescription -> Current route

CFDictionaryRef newRouteRef = CFDictionaryGetValue(routeChangeDictionary, kAudioSession_AudioRouteChangeKey_CurrentRouteDescription);
NSDictionary *newRouteDict = (NSDictionary *)newRouteRef;

// RouteDetailedDescription_Outputs -> Output
// RouteDetailedDescription_Outputs -> Input

NSArray * paths = [[newRouteDict objectForKey: @"RouteDetailedDescription_Outputs"] count] ? [newRouteDict objectForKey: @"RouteDetailedDescription_Outputs"] : [newRouteDict objectForKey: @"RouteDetailedDescription_Inputs"];

NSString * newRouteString = [[paths objectAtIndex: 0] objectForKey: @"RouteDetailedDescription_PortType"];

// newRouteString -> MicrophoneWired, Speaker, LineOut, Headphone

问候语

这是解决方案,你可能喜欢它,也可能对你有帮助。

在使用以下方法之前,请同时写下这两行

UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_None; AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,sizeof (audioRouteOverride),&audioRouteOverride);

(void)isHeadsetPluggedIn {
    UInt32 routeSize = sizeof (CFStringRef); CFStringRef route;
    AudioSessionGetProperty (kAudioSessionProperty_AudioRoute, &routeSize, &route);

    //NSLog(@"Error >>>>>>>>>> :%@", error); 
    /* Known values of route:
    "Headset"
    "Headphone"
    "Speaker"
    "SpeakerAndMicrophone"
    "HeadphonesAndMicrophone"
    "HeadsetInOut"
    "ReceiverAndMicrophone"
    "Lineout" */

    NSString* routeStr = (NSString*)route;

    NSRange headsetRange = [routeStr rangeOfString : @"Headset"]; NSRange receiverRange = [routeStr rangeOfString : @"Receiver"];

    if(headsetRange.location != NSNotFound) {
        // Don't change the route if the headset is plugged in. 
        NSLog(@"headphone is plugged in "); 
    } else
        if (receiverRange.location != NSNotFound) { 
            // Change to play on the speaker 
            NSLog(@"play on the speaker");
        } else {
            NSLog(@"Unknown audio route.");
        }
}

要执行一次性检查以确定耳机是否已插入(而不是在拔下耳机时设置回拨),我在iOS5及更高版本中发现了以下功能:

- (BOOL) isAudioJackPlugged
{

// initialise the audio session - this should only be done once - so move this line to your AppDelegate
AudioSessionInitialize(NULL, NULL, NULL, NULL);
UInt32 routeSize;

// oddly, without calling this method caused an error.
AudioSessionGetPropertySize(kAudioSessionProperty_AudioRouteDescription, &routeSize);
CFDictionaryRef desc; // this is the dictionary to contain descriptions

// make the call to get the audio description and populate the desc dictionary
AudioSessionGetProperty (kAudioSessionProperty_AudioRouteDescription, &routeSize, &desc);

// the dictionary contains 2 keys, for input and output. Get output array
CFArrayRef outputs = CFDictionaryGetValue(desc, kAudioSession_AudioRouteKey_Outputs);

// the output array contains 1 element - a dictionary
CFDictionaryRef dict = CFArrayGetValueAtIndex(outputs, 0);

// get the output description from the dictionary
CFStringRef output = CFDictionaryGetValue(dict, kAudioSession_AudioRouteKey_Type);

/**
 These are the possible output types:
 kAudioSessionOutputRoute_LineOut
 kAudioSessionOutputRoute_Headphones
 kAudioSessionOutputRoute_BluetoothHFP
 kAudioSessionOutputRoute_BluetoothA2DP
 kAudioSessionOutputRoute_BuiltInReceiver
 kAudioSessionOutputRoute_BuiltInSpeaker
 kAudioSessionOutputRoute_USBAudio
 kAudioSessionOutputRoute_HDMI
 kAudioSessionOutputRoute_AirPlay
 */

return CFStringCompare(output, kAudioSessionOutputRoute_Headphones, 0) == kCFCompareEqualTo;
}

对于那些在家记分数的人来说,这是字典中的一个字符串,在字典中的一个数组中。