Not showing on UITableView

[GopalPatel1989]

self.activityIndicator = [[PCAngularActivityIndicatorView alloc] initWithActivityIndicatorStyle:PCAngularActivityIndicatorViewStyleDefault];
    self.activityIndicator.color = [UIColor colorWithRed:232.0/255.0 green:77.0/255.0 blue:95.0/255.0 alpha:1.0];
    self.activityIndicator.center = self.tblGuest.center;
    [self.tblGuest addSubview:self.activityIndicator];
    [self.activityIndicator startAnimating];

I tried like this above to show your controller in the center of table view but it is not showing. Works well when used view with view (view inside view).