Question

我有一个ViewController，ScrollView内有一个ScrollView和一个视图。视图由多个TextFields组成。还有一个NavigationContoller。当我点击TextField并再次单击屏幕上的键盘时键盘消失但视图向上移动并且某些文本字段隐藏。请帮我解决这个问题

这是我的代码：

class EODViewController: UIViewController, UIScrollViewDelegate, UITextFieldDelegate {

@IBOutlet weak var views: UIView!
@IBOutlet weak var scrollView: UIScrollView!
@IBOutlet weak var inc50: UITextField!
@IBOutlet weak var out50: UITextField!
@IBOutlet weak var dec50: UITextField!

@IBOutlet weak var savebutton: UIButton!

var activeField: UITextField?
let button = UIButton(type: UIButtonType.custom)

override func viewDidLoad() {
    super.viewDidLoad()
    self.navigationItem.title = "Before EOD"

    //For Back button task
    self.navigationItem.hidesBackButton = true

    //to dismiss keyboard on click anywhere on screen
    let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(ViewController.dismissKeyboard))
    view.addGestureRecognizer(tap)

    // to get keyboard notifications
    registerForKeyboardNotifications()

    //textfield delegates
    self.inc50.delegate = self
    self.out50.delegate = self
    self.end50.delegate = self
    self.dec50.delegate = self

}


override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    self.view.endEditing(true)
}
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
    let allowedCharacters = CharacterSet.decimalDigits
    let characterSet = CharacterSet(charactersIn: string)
    return allowedCharacters.isSuperset(of: characterSet)

}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {

    self.out50.resignFirstResponder()
    self.end50.resignFirstResponder()
    self.str50.resignFirstResponder()
    self.inc50.resignFirstResponder()
    self.dec50.resignFirstResponder()

    if textField == self.out50 {

        if self.out50.text?.isEmpty ?? true
        {
            self.out50.attributedPlaceholder = NSAttributedString(string: "Enter Value", attributes: [NSForegroundColorAttributeName : UIColor.red])
            return false
        }
        if end50.isUserInteractionEnabled == false
        {
            if checkValue(textvalue: out50, deno: 50, errorText: error50) == false
            {
                return false
            }
            if error50.text != "Enter multiple of 50"
            {
            editProcessBeforeoneOut(str: str50, inc: inc50, dec: dec50, out: out50, end: end50,terror: error50)
            self.out100.becomeFirstResponder()
            }
        }
        else{
        self.end50.becomeFirstResponder()
        if error50.isHidden == false
        {
        }
        }
    }
    if textField == self.str50
    {
        if self.str50.text?.isEmpty ?? true
        {
            self.str50.attributedPlaceholder = NSAttributedString(string: "Enter Value", attributes: [NSForegroundColorAttributeName : UIColor.red])
            return false
        }
       if checkValue(textvalue: str50, deno: 50, errorText: error50) == false
       {
        self.str50.becomeFirstResponder()
        return false
        }
        if error50.text != "Enter multiple of 50"
        {
            editProcessBeforeoneOut(str: str50, inc: inc50, dec: dec50, out: out50, end: end50,terror: error50)
        self.inc50.becomeFirstResponder()
        }
    }
    if textField == self.inc50
    {
        if self.inc50.text?.isEmpty ?? true
        {
            self.inc50.attributedPlaceholder = NSAttributedString(string: "Enter Value", attributes: [NSForegroundColorAttributeName : UIColor.red])
            return false
        }
        if checkValue(textvalue: str50, deno: 50, errorText: error50) == false
        {
            return false
        }
        if error50.text != "Enter multiple of 50"
        {
            editProcessBeforeoneOut(str: str50, inc: inc50, dec: dec50, out: out50, end: end50,terror: error50)
        self.dec50.becomeFirstResponder()
        }
    }


    return true
}

func validate() -> Bool
{
    var valid : Bool = true
    if self.str50.text?.isEmpty ?? true
    {
        str50.attributedPlaceholder = NSAttributedString(string: "Enter value", attributes: [NSForegroundColorAttributeName : UIColor.red])
        valid = false
    }

    return valid

}


func registerForKeyboardNotifications(){

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

}

func deregisterFromKeyboardNotifications(){
    //Removing notifies on keyboard appearing
    NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillShow, object: nil)
    NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}

func keyboardWasShown(notification: NSNotification){
    //Need to calculate keyboard exact size due to Apple suggestions
    self.scrollView.isScrollEnabled = true
    var info = notification.userInfo!
    let keyboardSize = (info[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue.size
    let contentInsets : UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize!.height, 0.0)

    self.scrollView.contentInset = contentInsets
    self.scrollView.scrollIndicatorInsets = contentInsets

    var aRect : CGRect = self.view.frame
    aRect.size.height -= keyboardSize!.height
    if let activeField = self.activeField {
        if (!aRect.contains(activeField.frame.origin)){
           // self.scrollView.scrollRectToVisible(activeField.frame, animated: true)
        }
    }
}

func keyboardWillBeHidden(notification: NSNotification){
    //Once keyboard disappears, restore original positions

    self.view.endEditing(true)
    self.scrollView.isScrollEnabled = true
}

func textFieldDidBeginEditing(_ textField: UITextField){
    activeField = textField
      NotificationCenter.default.addObserver(self, selector: #selector(EODViewController.keyboardWillShow(_:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
}

func textFieldDidEndEditing(_ textField: UITextField){
    activeField = nil
}

func dismissKeyboard() {
    view.endEditing(true)
}

func back(sender: UIBarButtonItem) {
    // Perform your custom actions
    // ...
    // Go back to the previous ViewController
    _ = navigationController?.popViewController(animated: true)


}

override func viewWillAppear(_ animated: Bool) {

    button.setTitle("Return", for: UIControlState())
    button.setTitleColor(UIColor.black, for: UIControlState())
    button.frame = CGRect(x: 0, y: 163, width: 106, height: 53)
    button.adjustsImageWhenHighlighted = false
    button.addTarget(self, action: #selector(ViewController.Done(_:)), for: UIControlEvents.touchUpInside)

}


func keyboardWillShow(_ note : Notification) -> Void{
    DispatchQueue.main.async { () -> Void in
        self.button.isHidden = false

        self.scrollView.isScrollEnabled = true

        var info = note.userInfo!
        let keyBoardWindow = UIApplication.shared.windows.last
        self.button.frame = CGRect(x: 0, y: (keyBoardWindow?.frame.size.height)!-53, width: 106, height: 53)
        keyBoardWindow?.addSubview(self.button)
        keyBoardWindow?.bringSubview(toFront: self.button)
         let keyboardSize = (info[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue.size
        let contentInsets : UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize!.height, 0.0)

        self.scrollView.contentInset = contentInsets
        self.scrollView.scrollIndicatorInsets = contentInsets

        var aRect : CGRect = self.view.frame
        aRect.size.height -= keyboardSize!.height
        if let activeField = self.activeField {
            if (!aRect.contains(activeField.frame.origin)){
                self.scrollView.scrollRectToVisible(activeField.frame, animated: true)
            }
        }


        UIView.animate(withDuration: (((note.userInfo! as NSDictionary).object(forKey: UIKeyboardAnimationCurveUserInfoKey) as AnyObject).doubleValue)!, delay: 0, options: UIViewAnimationOptions.curveEaseIn, animations: { () -> Void in
            self.view.frame = self.view.frame.offsetBy(dx: 0, dy: 0)
        }, completion: { (complete) -> Void in

        })

    }

}

func Done(_ sender : UIButton){

    DispatchQueue.main.async { () -> Void in

        self.textFieldShouldReturn(self.activeField!)
    }

}

}

Answer 1

您应该在UITableView中尝试UIViewController。 UITableView自动管理优于UIScrollView。您的所有文本字段都可以放在UIView中，该TableView设置为let headerView = UIView() headerView.translatesAutoresizingMaskIntoConstraints = false headerView.height(header_height) tableView.tableHeaderView = UIView() tableView.tableHeaderView?.frame.size.height = header_height tableView.tableHeaderView?.addSubview(headerView) // set autolayout for headerView to fill the tableView.tableHeaderView here标题视图。

style: cytoscape.stylesheet()
  .selector('node')
    .css({
      'content': 'data(id)',
      'background-color': '#4286f4'
    })
  .selector('edge.highlighted')
    .css({
      'line-color': 'black',
      'target-arrow-color': '#b830f7'
    })
  .selector('edge')
    .css({
      'curve-style': 'bezier',
      'target-arrow-shape': 'triangle',
      'width': 4,
      'line-color': '#4286f4',
      'target-arrow-color': '#4286f4'
    }),
});

cy.unbind('click');
cy.bind('click', function(e){
   if (e.target === cy || e.target.group() == "edges")  {
      cy.edges().removeClass('highlighted');  
   }
   else { 
      cy.edges("[source='" + e.target.id() + "']").addClass('highlighted');
   }
});

Answer 2

您可能希望使用UITableView代替UIScrollView。当UITextFields中有多个UITableView时，有一个非常稳定的库来处理键盘。查看TPKeyboardAvoiding。我一直在我的几个应用程序中使用它，它的效果非常好。

查看向上移动

2 个答案: