I would like to Integrate Google Analytics Tracking into my IOS APP.

I have integrated Google Analytics Library and Add It To my Application.

cf. https://developers.google.com/analytics/devguides/collection/ios/v2/

into my code to tracking my view contact

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    self.trackPageView = @"Contact Screen";
    //
}

A have this error "Property 'TrackPageView' not found on object of the type 'ContactViewController'" Please help me