如何通过单击按钮以编程方式添加导航栏

Question

我有登录，注册和重置viewControllers我已经将UINavigation控制器连接到登录控制器，但是当我通过单击诸如signup或reset password之类的按钮转到其他视图控制器时，目标控制器将出现而没有导航栏。 单击下面的按钮时，以编程方式帮助包含导航栏。

@IBAction func signupButton(_ sender: Any) {
let storyBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let newViewController = storyBoard.instantiateViewController(withIdentifier: "SignUpViewController") as! SignUpViewController
self.present(newViewController, animated: true, completion: nil)
}

Answer 1

对于显示导航栏，您需要在UINavigationController添加SignUpViewController ，您可以直接在Storyboard中添加By

选择SignUpViewController->编辑器菜单->嵌入->导航控制器

要么

您可以像这样以编程方式添加

IBAction func signupButton(_ sender: Any) {
     let storyBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
     let newViewController = storyBoard.instantiateViewController(withIdentifier: "SignUpViewController") as! SignUpViewController
     let naviCon = UINavigationController(rootViewController:newViewController)
     self.present(naviCon, animated: true, completion: nil)
}