Cocos2D 2.1: “Delegate” deprecated in iOS 6. How do I set the delegate for this AVAudioSession?

问题:

Started a Cocos2D 2.1 template (with no physics engine) in Xcode 4.5, targeted for iOS 6 and iPad. In the CDAudioManager.m file, the following code...

AVAudioSession* session = [AVAudioSession sharedInstance]; session.delegate = self;  // Which is what is automatically generated by the template. 

...generates the following warning...

"delegate deprecated:  first deprecated in iOS 6" 

So I go to the apple developer documentation, and it says under "delegate," "Deprecated in iOS 6.0. Use the notifications described in the Notifications section of this class instead."

http://developer.apple.com/library/ios/#documentation/AVFoundation/Reference/AVAudioSession_ClassReference/DeprecationAppendix/AppendixADeprecatedAPI.html#//apple_ref/occ/instp/AVAudioSession/delegate

Problem is, it looks to me like all we're trying to do--forgive my inexperience--is set the delegate for the AVAudioSession to the CDAudioManager instance itself. How do the notifications accomplish this? Or am I just wrong about the goal of the above code?

回答1:

The error you are running into is in this block of code

AVAudioSession* session = [AVAudioSession sharedInstance]; session.delegate = self;// <-------- DEPRECATED IN IOS 6.0 

To silence the warning change those 2 lines to this:

[[AVAudioSession sharedInstance] setActive:YES error:nil]; 

Hope this helps.

回答2:

Instead of using delegate use notification for handling as follows

[AVAudioSession sharedInstance]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(interruption:) name:AVAudioSessionInterruptionNotification object:nil];   - (void) interruption:(NSNotification*)notification    {     NSDictionary *interuptionDict = notification.userInfo;      NSUInteger interuptionType = (NSUInteger)[interuptionDict valueForKey:AVAudioSessionInterruptionTypeKey];     if (interuptionType == AVAudioSessionInterruptionTypeBegan)         [self beginInterruption];      else if (interuptionType == AVAudioSessionInterruptionTypeEnded)         [self endInterruption]; } 

回答3:

I found a poast about this on the Cocos2D-iPhone.org forums. While I don't fully understand it--but I'm working on it--it did seem to take care of the problem, at least temporarily. What he did was write this method in the CDAudioManger.m file:

-(void) releaseBufferForFile:(NSString *) filePath {     int bufferId = [self bufferForFile:filePath create:NO];     if (bufferId != kCDNoBuffer) {         [soundEngine unloadBuffer:bufferId];         [loadedBuffers removeObjectForKey:filePath];         NSNumber *freedBufferId = [[NSNumber alloc] initWithInt:bufferId];         [freedBufferId autorelease];         [freedBuffers addObject:freedBufferId];     } } @end  - (void) interruption:(NSNotification*)notification {     NSDictionary *interuptionDict = notification.userInfo;             NSNumber* interuptionTypeValue = [dict valueForKey:AVAudioSessionInterruptionTypeKey];     NSUInteger interuptionType = [interuptionTypeValue intValue];      if (interuptionType == AVAudioSessionInterruptionTypeBegan)         [self beginInterruption]; #if __CC_PLATFORM_IOS >= 40000     else if (interuptionType == AVAudioSessionInterruptionTypeEnded)         [self endInterruptionWithFlags:(NSUInteger)[interuptionDict valueForKey:AVAudioSessionInterruptionOptionKey]]; #else     else if (interuptionType == AVAudioSessionInterruptionTypeEnded)         [self endInterruption]; #endif } 

Then he replaced:

AVAudioSession *session = [AVAudioSession sharedInstance]; session.delegate = self; 

with this:

[AVAudioSession sharedInstance]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(interruption:) name:AVAudioSessionInterruptionNotification object:nil]; 

Here's the link: http://www.cocos2d-iphone.org/forum/topic/49956

If and when I develop a better understand of what this code is doing, I'll be sure to edit this post.

回答4:

I haven't tested this but according to this post: http://www.cocos2d-iphone.org/forums/topic/cdaudiomanager-line-402-delegate-is-deprecated/#post-390211

float osVersion = [[UIDevice currentDevice].systemVersion floatValue]; if (osVersion >=6.0) { [AVAudioSession sharedInstance]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(interruption:) name:AVAudioSessionInterruptionNotification object:nil]; } else { AVAudioSession* session = [AVAudioSession sharedInstance]; session.delegate = self; } 

I.e. throw different code runtime depending on iOS version.

Now, my app is iOS 6.0+ only anyway so I'll just go with:

[AVAudioSession sharedInstance]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(interruption:) name:AVAudioSessionInterruptionNotification object:nil]; 

And cross my thumbs.

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