根据view得到controller

- (JJNavigationController *)viewController {

    for (UIView* next = self.view.superview; next; next = next.superview) {

        UIResponder *nextResponder = [next nextResponder];

        if ([nextResponder isKindOfClass:[JJNavigationController class]]) {

            

            JJNavigationController *nav = (JJNavigationController *)nextResponder;

            return nav;

        }

    }

    return nil;

}