iOS monitor output device changes (monitor headset plug-and-unplug, Bluetooth device connection disconnect, etc.) implementation

Source: Internet
Author: User

Before IOS6, we have the following methods:

#import<AVFoundation/AVFoundation.h>

[[avaudiosession sharedinstance] setdelegate:self];


Audiosessionaddpropertylistener (kaudiosessionproperty_audioroutechange,audioroutechangelistenercallback, self);

Then implement the callback:

// Audio monitoring callback function

Static void audioroutechangelistenercallback (void *inuserdata,

Audiosessionpropertyid Inpropertyid,

UInt32 Inpropertyvaluesize,

Const void *inpropertyvalue

)

{

if (Inpropertyid! =kaudiosessionproperty_audioroutechange)

{

return;

}

//Determines the reason for the ensure

//Because of a category change.

cfdictionaryref routechangedictionary = inpropertyvalue;

cfnumberref routechangereasonref = cfdictionarygetvalue (routechangedictionary, cfstr ( C4>kaudiosession_audioroutechangekey_reason));

SInt32 Routechangereason;

Cfnumbergetvalue (Routechangereasonref,kcfnumbersint32type, &routechangereason);

Do your handling here

}

Please note[[avaudiosessionsharedinstance] setdelegate: Self] must not be omitted, otherwise the callback should not be triggered.
------------------------Split Line------------------------the above method is IOS6 the previous implementation, we can see that this API is a relatively low-level implementation, its callback or C implementation, rather than our usual practice of OC implementation. so in IOS6 and beyond, the API is deprecated (of course, if you still use it, you can still implement the function), we have a better and more advanced implementation to solve the problem:

[[nsnotificationcenterdefaultcenter] addobserver: Self selector:@selector(outputdevicechanged:) Name:avaudiosessionroutechangenotificationObject: [ Avaudiosessionsharedinstance]];

-(void) outputdevicechanged: (nsnotification *) anotification

{

Do your jobs here

}

Please note that the parameters of the addobserver are filled in: the object must be[avaudiosession sharedinstance], instead of nil, which we usually fill in many cases, the notification will not be triggered if nil is here.







iOS monitor output device changes (monitor headset plug-and-unplug, Bluetooth device connection disconnect, etc.) implementation

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.