iPhone AVAudioRecorder pause problem after entering background

I have a problem with pausing AVAudioRecorder after entering background. Basically, it goes like this (_recorder is my AVAudioRecorder instance):

1. Start recording:

   [_recorder record];
   

2. Press the home button on the device.

3. Because I've set observer for notification of this case (in viewDidLoad), my custom method applicationDidEnterBackground fires.

4. In applicationDidEnterBackground I do:

   [_recorder pause];
   

5. Now, when I tap application icon, to take app to foreground, recording continous immediately, without taking any action. It's even stranger, because checking property:

   _recorder.recording == YES
   

returns NO.

I have a function, that is called by NSTimer every 0.1s (to refresh UI etc.), and in that function I have this:

if(_recorder.recording) {
    NSLog(@"recording");
}
else {
    NSLog(@"not recording");
    NSLog(@"time: %f", _recorder.currentTime);
} 

It prints on the console:

    ...
    not recording
    time: 9.404082
    not recording
    not recording
    time: 9.473197
    not recording
    time: 9.531179
    not开发者_StackOverflow社区 recording
    time: 9.629206
    not recording
    time: 9.728435
    ...

So, as you can see, the recorder's currentTime increases all the time, and the audio is being recorded.

Any Idea how to solve this?

You should add the following code:

<key>UIBackgroundModes</key>
<array>
    <string>audio</string>
</array>

to the Info.plist. This will cause the background mode to be responsive for managing audio session, so you can manually pause and resume recording.