ios - 如何使用Swift语言弹出VC跳转前两个View Controller？

Question

我有 4 个 View Controller :欢迎、注册、登录、忘记密码。 Welcome 询问用户是否有帐户。如果是，用户应该点击登录按钮，否则用户应该点击注册按钮。

如果用户按下 SignUp 按钮，应用程序将推送到 SignUp View Controller，用户将填写表单并点击 SignUp 按钮。单击该注册按钮应显示登录 VC。但相反，它回到了欢迎的 Main VC。

//This is the SignUp Action Btn 

@IBAction func actSingUp(_ sender: Any) {

    let storyboard = UIStoryboard(name: "LoginSB", bundle: nil)
    let signupvc = storyboard.instantiateViewController(withIdentifier: "loginVC") as! LoginVC
    navigationController?.popViewController(animated: true)

}

Answer 1

您正在popping(返回到之前的 Controller )而不是pushing(添加新的) View Controller 。你应该做的是:

@IBAction func actSingUp(_ sender: Any) {

   let storyboard = UIStoryboard(name: "LoginSB", bundle: nil)
   let signupvc = storyboard.instantiateViewController(withIdentifier: "loginVC") as! LoginVC

   // this step is optional, it will remove SignUp controller from navigation stack
   navigationController?.popViewController(animated: false)

   // present login controller
   navigationController?.pushViewController(signupvc, animated: true)   
}