UI：UINavigationController 一键回来

 func goHome(){
        
        
//        self.navigationController?.dismissViewControllerAnimated(true, completion: nil)   错了
//        self.navigationController?.popViewControllerAnimated(true)                            接近了
        
    self.navigationController?.popToRootViewControllerAnimated(true)
    
    
    
    
    }

多个 UINavigationController 视图， 一键回来