How can i get time of my recorded audio in iphone?

Question

I am recording audio using AVAudioRecorder,and now i want to get exact time duration of my recorded audio,how can i get that.

i have tried this:

AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:avAudioRecorder.url options:nil];
CMTime time = asset.duration;
double durationInSeconds = CMTimeGetSeconds(time);

But my time variable return NULL and durationInSeconds return 'nan',what does that means by nan.

UPDATE

user1903074 answer have solved my problem but just for curiosity ,is thair any way to do it without AVAudioplayer.

Answer 1

A couple of the answers here use the same really poor time formatting that gives results like "0.1" for 1 second elapsed or "0.60" for 1 minute. If you want something that gives you a normal looking time like 0:01 or 1:00 then use this:

let minutes = Int(audioRecorder.currentTime / 60)
let seconds = Int(audioRecorder.currentTime) - (minutes * 60)
let timeInfo = String(format: "%d:%@%d", minutes, seconds < 10 ? "0" : "", seconds)

Answer 2

If you are using AVAudioPlayer with AVAudioRecorder than you can get the audioPlayer.duration and get the time.

like this.

 NSError *playerError;

 audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:yoururl error:&playerError];

 NSlog(@"%@",audioPlayer.duration);

But only if you are using AVAudioPlayer with AVAudioRecorder.

UPDATE

Or you can do like this.

//put this where you start recording
     myTimer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(updateTime) userInfo:nil repeats:YES];

// a method for update
- (void)updateTime {
    if([recorder isRecording])
    {

        float minutes = floor(recorder.currentTime/60);
        float seconds = recorder.currentTime - (minutes * 60);

        NSString *time = [[NSString alloc] 
                                    initWithFormat:@"%0.0f.%0.0f",
                                    minutes, seconds];
    }
}

steel you can get some delay becouse their is some microsecond value,and i dont know how to clip it .but thats all.