# \*Tracking Status

Check Tracking status with next\
Objective-c:

```
[RPTracker instance].isActive
```

Detect state changes with Notification:\
Objective-c:

```
[[NSNotificationCenter defaultCenter]
     addObserver:self
     selector:@selector(observeTracker)
     name:RPTrackerDidChangeActivityNotification
     object:nil];
```

and Observer\
Objective-c:

```
- (void)observeTracker {
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        self.startButton.enabled = ![RPTracker instance].isActive;
        self.stopButton.enabled = [RPTracker instance].isActive;
        
        if ([RPTracker instance].isActive) {
            self.tokenLabel.text = @"tracking is active";
        } else {
            self.tokenLabel.text = @"tracking is not active";
        }
    });
}
```

Detect state changes with Delegate:\
**RPTrackingStateListenerDelegate**\
Objective-c:

```
@interface AppDelegate () <RPSpeedLimitDelegate, RPTrackingStateListenerDelegate> {
    
}

@end
```

Delegate Method\
Objective-c:

```
- (void)trackingStateChanged:(Boolean)state {
    NSLog(@"tracking state changed to %hhu", state);
}
```

### Start / Stop Tracking&#x20;

Manual start and stop tracking don't switch off automatic start / stop tracking. For manual start track you could use:

```
[[RPTracker instance] startTracking];
```

For manual stop track you could use:

```
[[RPTracker instance] stopTracking];
```


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