獲取tabar點擊事件 UITabBarControllerDelegate

- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController{
    
    UINavigationController *nav = (UINavigationController *)viewController;
    UIViewController *VC =nav.topViewController;
    if ([VC isKindOfClass:[FXMessageViewController class]]) {
        
        [self headerRereshing];
        
        return YES;
    }
    return YES;
    
}