标签出口不能被其他视图控制器在迅速编辑3

Question

我想改变登录屏幕userName的出口，但其不工作我找不到我们的解决方案

let loginVC = storyboard?.instantiateViewController(withIdentifier: "LoginViewController") as! LoginViewController 
    if self.emailTextField.text == "" { 
     loginVC.userName?.text = "Hello" 
    } else { 
     loginVC.userName?.text = self.emailTextField.text! 
    } 
    navigationController?.pushViewController(loginVC, animated: true) 

Answer 1

试试这个：

let loginVC = storyboard?.instantiateViewController(withIdentifier: "LoginViewController") as! LoginViewController 
if self.emailTextField.text == "" 
{ 
    loginVC.str = "Hello" 
} 
else 
{ 
    loginVC.str = self.emailTextField.text! 
} 
navigationController?.pushViewController(loginVC, animated: true) 

LoginViewController

class LoginViewController: UIViewController 
{ 
    var str:String! = nil 
    override func viewDidLoad() 
    { 
     super.viewDidLoad() 
     self.userName.text = str 
    } 
}