从选择UITextField按下到另一个UITextField的过渡是否会导致UIView在Swift中重新加载？

Question

我尽快有以下几种观点为我的应用程序加载：

虽然我点击姓名文本字段很快，键盘表演和移动元素一点点允许注册按钮保持出现。

的问题，当我移动到第二个文本字段出现。它会导致视图完全重新加载，并将视图中的所有元素放置到其原始位置，从而使关键板隐藏最低的元素。这显示在下面的图

我已搜查，如果问题来自于一个事实，即键盘负荷keyboardwillshow()和keyboardwillhide当这个问题发生，因为我已经验证不会被调用的所有检查。

从选择UITextField按下到另一个UITextField的过渡是否会导致UIView重新加载Xcode？请不就是UIText领域处于

import UIKit 
import SendBirdSDK 

class LoginController: UIViewController { 

    var keyboardShowing = false 

    let inputsContainerView: UIView = { 
     let view = UIView() 
     view.backgroundColor = UIColor.white 
     view.translatesAutoresizingMaskIntoConstraints = false 
     view.layer.cornerRadius = 5 
     view.layer.masksToBounds = true 

     return view 
    }() 

    lazy var loginRegisterButton: UIButton = { 
     let button = UIButton(type: .system) 
     button.backgroundColor = UIColor(r: 88, g: 101, b: 161) 
     button.setTitle("Register", for: .normal) 
     button.translatesAutoresizingMaskIntoConstraints = false 
     button.setTitleColor(UIColor.white, for: .normal) 
     button.titleLabel?.font = UIFont.boldSystemFont(ofSize: 16) 

     button.addTarget(self, action: #selector(handleLoginRegister), for: .touchUpInside) 
     return button 
    }() 

    func handleLoginRegister() { 
     if loginRegisterSegmentedControl.selectedSegmentIndex == 0 { 
      handleLogin() 
     } else { 
      handleRegister() 
     } 
    } 


    func handleLogin(){ 

     guard let userid = fullNameTextField.text, (passwordTextField.text != nil) else { 
      print ("Form is not valid") 
      return 
     } 



     SBDMain.connect(withUserId: userid, completionHandler: { (user, error) in 
      if error != nil { 
       print (error) 
       return 
      } 

      //successfully loggedin user 

      self.dismiss(animated: true, completion: nil) 


     }) 
    } 



    let nameTextField: UITextField = { 
     let tf = UITextField() 
     tf.placeholder = "Full Name" 
     tf.translatesAutoresizingMaskIntoConstraints = false 
     return tf 
    }() 

    let nameSeperatorView: UIView = { 
     let view = UIView() 
     view.backgroundColor = UIColor(r: 220, g: 220, b: 220) 
     view.translatesAutoresizingMaskIntoConstraints = false 
     return view 

    }() 

    let fullNameTextField: UITextField = { 
     let tf = UITextField() 
     tf.placeholder = "Username" 
     tf.translatesAutoresizingMaskIntoConstraints = false 
     return tf 
    }() 

    let fullNameSeperatorView: UIView = { 
     let view = UIView() 
     view.backgroundColor = UIColor(r: 220, g: 220, b: 220) 
     view.translatesAutoresizingMaskIntoConstraints = false 
     return view 

    }() 

    let passwordTextField: UITextField = { 
     let tf = UITextField() 
     tf.placeholder = "Password" 
     tf.translatesAutoresizingMaskIntoConstraints = false 
     tf.isSecureTextEntry = true 
     return tf 
    }() 

    lazy var profileImageView: UIImageView = { 
     let imageView = UIImageView() 
     imageView.image = UIImage(named: "gameofthrones_splash") 
     imageView.translatesAutoresizingMaskIntoConstraints = false 
     imageView.contentMode = .scaleAspectFill 

     imageView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleSelectProfileImageView))) 
     imageView.isUserInteractionEnabled = true 

     return imageView 
    }() 



    lazy var loginRegisterSegmentedControl: UISegmentedControl = { 
     let sc = UISegmentedControl(items: ["Login", "Register"]) 
     sc.translatesAutoresizingMaskIntoConstraints = false 
     sc.tintColor = UIColor.white 
     sc.selectedSegmentIndex = 1 
     sc.addTarget(self, action: #selector(handleLoginRegisterChange), for: .valueChanged) 
     return sc 
    }() 

    func handleLoginRegisterChange() { 
     if keyboardShowing == true { 
      view.endEditing(true) 
     } 
     /*else { 
      view.endEditing(false) 
     }*/ 

     let title = loginRegisterSegmentedControl.titleForSegment(at: loginRegisterSegmentedControl.selectedSegmentIndex) 
     loginRegisterButton.setTitle(title, for: UIControlState()) 

     // change height of inputContainerView, but how??? 
     inputsContainerViewHeightAnchor?.constant = loginRegisterSegmentedControl.selectedSegmentIndex == 0 ? 100 : 150 

     // change height of nameTextField 
     nameTextFieldHeightAnchor?.isActive = false 
     nameTextFieldHeightAnchor = nameTextField.heightAnchor.constraint(equalTo: inputsContainerView.heightAnchor, multiplier: loginRegisterSegmentedControl.selectedSegmentIndex == 0 ? 0 : 1/3) 
     nameTextFieldHeightAnchor?.isActive = true 
     nameTextField.isHidden = loginRegisterSegmentedControl.selectedSegmentIndex == 0 

     fullNameTextFieldHeightAnchor?.isActive = false 
     fullNameTextFieldHeightAnchor = fullNameTextField.heightAnchor.constraint(equalTo: inputsContainerView.heightAnchor, multiplier: loginRegisterSegmentedControl.selectedSegmentIndex == 0 ? 1/2 : 1/3) 
     fullNameTextFieldHeightAnchor?.isActive = true 

     passwordTextFieldHeightAnchor?.isActive = false 
     passwordTextFieldHeightAnchor = passwordTextField.heightAnchor.constraint(equalTo: inputsContainerView.heightAnchor, multiplier: loginRegisterSegmentedControl.selectedSegmentIndex == 0 ? 1/2 : 1/3) 
     passwordTextFieldHeightAnchor?.isActive = true 

    } 



    override func viewDidLoad() { 
     super.viewDidLoad() 



     view.backgroundColor = UIColor(r: 61, g: 91, b: 151) 

     view.addSubview(inputsContainerView) 
     view.addSubview(loginRegisterButton) 
     view.addSubview(profileImageView) 
     view.addSubview(loginRegisterSegmentedControl) 


     setupInputsContainerView() 
     setupLoginRegisterButton() 
     setupProfileImageView() 
     setupLoginRegisterSegmentedControl() 

     NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil) 
     NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil) 

     //connecting to the application 
     SBDMain.initWithApplicationId("1662A8E8-F45F-454B-9E5E-02362342ECC5") 



    } 

    func keyboardWillShow(notification: NSNotification) { 

     print ("keyboardwillshow was called") 

     if self.keyboardShowing { 
      return 
     } 



      if self.keyboardShowing == false { 
       self.inputsContainerView.frame.origin.y -= 58 
       self.loginRegisterButton.frame.origin.y -= 58 
       self.loginRegisterSegmentedControl.frame.origin.y -= 58 
       self.profileImageView.frame.origin.y -= 58 

      } 
      self.keyboardShowing = true 

    } 

    func keyboardWillHide(notification: NSNotification) { 

     print ("keyboardwillhide was called") 

     if !self.keyboardShowing { 
      return 
     } 


      if self.keyboardShowing == true { 
       self.inputsContainerView.frame.origin.y += 58 
       self.loginRegisterButton.frame.origin.y += 58 
       self.loginRegisterSegmentedControl.frame.origin.y += 58 
       self.profileImageView.frame.origin.y += 58 
      } 
      self.keyboardShowing = false 

    } 

    func setupLoginRegisterSegmentedControl() { 
     //need x, y, width, height constraints 
     loginRegisterSegmentedControl.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true 
     loginRegisterSegmentedControl.bottomAnchor.constraint(equalTo: inputsContainerView.topAnchor, constant: -12).isActive = true 
     loginRegisterSegmentedControl.widthAnchor.constraint(equalTo: inputsContainerView.widthAnchor, multiplier: 1).isActive = true 
     loginRegisterSegmentedControl.heightAnchor.constraint(equalToConstant: 36).isActive = true 
    } 

    func setupProfileImageView(){ 

     //need x, y, width, height constraints 
     profileImageView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true 
     profileImageView.bottomAnchor.constraint(equalTo: loginRegisterSegmentedControl.topAnchor, constant: -12).isActive = true 
     profileImageView.widthAnchor.constraint(equalToConstant: 150).isActive = true 
     profileImageView.heightAnchor.constraint(equalToConstant: 150).isActive = true 


    } 

    var inputsContainerViewHeightAnchor: NSLayoutConstraint? 
    var nameTextFieldHeightAnchor: NSLayoutConstraint? 
    var fullNameTextFieldHeightAnchor: NSLayoutConstraint? 
    var passwordTextFieldHeightAnchor: NSLayoutConstraint? 

    func setupInputsContainerView(){ 
     //need x, y, width, height constraints 
     inputsContainerView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true 
     inputsContainerView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true 
     print(self.inputsContainerView.frame.origin.y) 
     inputsContainerView.widthAnchor.constraint(equalTo: view.widthAnchor, constant: -24).isActive = true 
     inputsContainerViewHeightAnchor = inputsContainerView.heightAnchor.constraint(equalToConstant: 150) 
     inputsContainerViewHeightAnchor?.isActive = true 

     inputsContainerView.addSubview(nameTextField) 
     inputsContainerView.addSubview(nameSeperatorView) 
     inputsContainerView.addSubview(fullNameTextField) 
     inputsContainerView.addSubview(fullNameSeperatorView) 
     inputsContainerView.addSubview(passwordTextField) 

     //need x, y, width, height constraints 
     nameTextField.leftAnchor.constraint(equalTo: inputsContainerView.leftAnchor, constant: 12).isActive = true 
     nameTextField.topAnchor.constraint(equalTo: inputsContainerView.topAnchor).isActive = true 

     nameTextField.widthAnchor.constraint(equalTo: inputsContainerView.widthAnchor).isActive = true 
     nameTextFieldHeightAnchor = nameTextField.heightAnchor.constraint(equalTo: inputsContainerView.heightAnchor, multiplier: 1/3) 
     nameTextFieldHeightAnchor?.isActive = true 

     //need x, y, width, height constraints 
     nameSeperatorView.leftAnchor.constraint(equalTo: inputsContainerView.leftAnchor).isActive = true 
     nameSeperatorView.topAnchor.constraint(equalTo: nameTextField.bottomAnchor).isActive = true 
     nameSeperatorView.widthAnchor.constraint(equalTo: inputsContainerView.widthAnchor).isActive = true 
     nameSeperatorView.heightAnchor.constraint(equalToConstant: 1).isActive = true 

     //need x, y, width, height constraints 
     fullNameTextField.leftAnchor.constraint(equalTo: inputsContainerView.leftAnchor, constant: 12).isActive = true 
     fullNameTextField.topAnchor.constraint(equalTo: nameTextField.bottomAnchor).isActive = true 

     fullNameTextField.widthAnchor.constraint(equalTo: inputsContainerView.widthAnchor).isActive = true 

     fullNameTextFieldHeightAnchor = fullNameTextField.heightAnchor.constraint(equalTo: inputsContainerView.heightAnchor, multiplier: 1/3) 

     fullNameTextFieldHeightAnchor?.isActive = true 

     //need x, y, width, height constraints 
     fullNameSeperatorView.leftAnchor.constraint(equalTo: inputsContainerView.leftAnchor).isActive = true 
     fullNameSeperatorView.topAnchor.constraint(equalTo: fullNameTextField.bottomAnchor).isActive = true 
     fullNameSeperatorView.widthAnchor.constraint(equalTo: inputsContainerView.widthAnchor).isActive = true 
     fullNameSeperatorView.heightAnchor.constraint(equalToConstant: 1).isActive = true 

     //need x, y, width, height constraints 
     passwordTextField.leftAnchor.constraint(equalTo: inputsContainerView.leftAnchor, constant: 12).isActive = true 
     passwordTextField.topAnchor.constraint(equalTo: fullNameTextField.bottomAnchor).isActive = true 

     passwordTextField.widthAnchor.constraint(equalTo: inputsContainerView.widthAnchor).isActive = true 
     passwordTextFieldHeightAnchor = passwordTextField.heightAnchor.constraint(equalTo: inputsContainerView.heightAnchor, multiplier: 1/3) 
     passwordTextFieldHeightAnchor?.isActive = true 
    } 

    func setupLoginRegisterButton(){ 

     //need x, y, width, height constraints 
     loginRegisterButton.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true 
     loginRegisterButton.topAnchor.constraint(equalTo: inputsContainerView.bottomAnchor, constant: 12).isActive = true 
     loginRegisterButton.widthAnchor.constraint(equalTo: inputsContainerView.widthAnchor).isActive = true 
     loginRegisterButton.heightAnchor.constraint(equalToConstant: 50).isActive = true 

    } 

    override var preferredStatusBarStyle: UIStatusBarStyle { 
     return .lightContent 
    } 



} 

extension UIColor { 

    convenience init(r: CGFloat, g: CGFloat, b: CGFloat) { 
     self.init(red: r/255, green: g/255, blue: b/255, alpha: 1) 
    } 

} 

Answer 1

而不是移动的元素UIView移动整个视图框架是这样的：

func keyboardWillShow(notification: NSNotification) { 

    print ("keyboardwillshow was called") 

    if self.keyboardShowing { 
     return 
    } 



     if self.keyboardShowing == false { 
      /*self.inputsContainerView.frame.origin.y -= 58 
      self.loginRegisterButton.frame.origin.y -= 58 
      self.loginRegisterSegmentedControl.frame.origin.y -= 58 
      self.profileImageView.frame.origin.y -= 58*/ 

      self.view.frame.origin.y -= 58 

     } 
     self.keyboardShowing = true 

} 

func keyboardWillHide(notification: NSNotification) { 

    print ("keyboardwillhide was called") 

    if !self.keyboardShowing { 
     return 
    } 


     if self.keyboardShowing == true { 
      /* self.inputsContainerView.frame.origin.y += 58 
      self.loginRegisterButton.frame.origin.y += 58 
      self.loginRegisterSegmentedControl.frame.origin.y += 58 
      self.profileImageView.frame.origin.y += 58*/ 

      self.view.frame.origin.y += 58 
     } 
     self.keyboardShowing = false 

}