如果使用Navigation Controller Swift，如何使用键盘向上移动UITextField

Question

我尝试向上移动UITextField，但如果使用导航控制器则不起作用，print(self.view.frame.origin.y)写-216

如果您不使用导航控制器

，一切都很完美

class RegistratoinViewController: UIViewController, UITextFieldDelegate {

@IBOutlet weak var nameTextField: UITextField!
@IBOutlet weak var emailTextField: UITextField!
@IBOutlet weak var passwordTextField: UITextField!
@IBOutlet weak var confirmPasswordTextField: UITextField!

var activeTextField: UITextField!

override func viewDidLoad() {
    super.viewDidLoad()
    singUpButton.enabled = false
    self.hideKeyboardWhenTappedAround()

    self.nameTextField.delegate = self
    self.emailTextField.delegate = self
    self.passwordTextField.delegate = self
    self.confirmPasswordTextField.delegate = self

    self.nameTextField.keyboardAppearance = UIKeyboardAppearance.Dark
    self.emailTextField.keyboardAppearance = UIKeyboardAppearance.Dark
    self.passwordTextField.keyboardAppearance = UIKeyboardAppearance.Dark
    self.confirmPasswordTextField.keyboardAppearance = UIKeyboardAppearance.Dark
    self.emailTextField.keyboardType = UIKeyboardType.EmailAddress
    NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(RegistratoinViewController.keyboardWillShow(_:)), name:UIKeyboardWillShowNotification, object: self.view.window)
    NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(RegistratoinViewController.keyboardWillHide(_:)), name:UIKeyboardWillHideNotification, object: self.view.window)
}

func keyboardWillHide(sender: NSNotification) {
    let userInfo: [NSObject : AnyObject] = sender.userInfo!
    let keyboardSize: CGSize = userInfo[UIKeyboardFrameBeginUserInfoKey]!.CGRectValue.size
    self.view.frame.origin.y += keyboardSize.height
}

override func viewWillDisappear(animated: Bool) {
    NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: self.view.window)
    NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: self.view.window)
}

func keyboardWillShow(sender: NSNotification) {
    let userInfo: [NSObject : AnyObject] = sender.userInfo!

    let keyboardSize: CGSize = userInfo[UIKeyboardFrameBeginUserInfoKey]!.CGRectValue.size
    let offset: CGSize = userInfo[UIKeyboardFrameEndUserInfoKey]!.CGRectValue.size

    if keyboardSize.height == offset.height {
        if self.view.frame.origin.y == 0 {
            UIView.animateWithDuration(0.1, animations: { () -> Void in
                self.view.frame.origin.y -= keyboardSize.height
            })
        }
    } else {
        UIView.animateWithDuration(0.1, animations: { () -> Void in
            self.view.frame.origin.y += keyboardSize.height - offset.height
        })
    }
    print(self.view.frame.origin.y)
}

}

Answer 1

如果使用滚动视图并在显示键盘时滚动它，将会更容易。在这里，您可以查看如何执行此操作：

http://blog.apoorvmote.com/move-uitextfield-up-when-keyboard-appears/?lang=ca