ios - 通过 popToViewController 在 swift 中传递变量值

Question

我在 LocationVC ViewController 上有一个变量“NameofCircle”，我在这个 Controller 上有一个变量 CName 我想通过 popToViewController 将 CName 值传递给 LocationVC Controller 。我尝试了下面的代码，但没有得到结果。

let viewControllers = self.navigationController!.viewControllers
    for aViewController in viewControllers
    {
        if aViewController is LocationVC
        {
           let Location = LocationVC()
            Location.NameofCircle = CName
    _ = self.navigationController?.popToViewController(aViewController, animated: true)
            }
}

Answer 1

试试这个。

let viewControllers = self.navigationController!.viewControllers
  for var aViewController in viewControllers
  {
  if aViewController is LocationVC
     {
        let aVC = aViewController as! LocationVC
        aVC.NameofCircle = CName
        _ = self.navigationController?.popToViewController(aVC, animated: true)
     }
  }

另一种选择将值传递给 Root ViewController

if let   myController  = self.navigationController?.viewControllers[0] as? LocationVC
  {
    myController.NameofCircle = CName
   _ =  self.navigationController?.popToViewController(myController, animated: true)
    }