iOS NavigationController问题处理

隐藏返回按钮
ViewController.navigationItem.hidesBackButton = true

隐藏返回按钮文字
navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: UIBarButtonItemStyle.plain, target: nil, action: nil)

如果使用上面的方法依然有返回文字，把上面的代码放进viewWillAppear方法中。

导航栏标题不见了
如果确认已经在控制器中设置了title，并且NavigationBar也可见，但是还是看不到标题。试试下面的代码：
navigationBar.isTranslucent = false

在导航控制器中临时插入控制器

var controllers = navigationController!.viewControllers
controllers.insert(newController, at: controllers.index(of: index)!)
navigationController?.viewControllers = controllers

替换根控制器

 var viewControllers = navigationController?.viewControllers
 viewControllers?.removeAll()
 viewControllers?.append(self)
 if let childControllers = viewControllers {
      navigationController?.viewControllers = childControllers
  }

移除特定的控制器

var viewControllers = navigationController?.viewControllers
viewControllers?.remove(at: index)
navigationController?.viewControllers = viewControllers