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如何使键盘出现并在点击视图时开始编辑文本字段

becomefirstresponder uitextfield swift ios

-1

TheRedCamaro3.0 3.0 · 技术社区 · 7 年前

我正在尝试这样做,当用户触摸 UIView 出现键盘,用户可以在文本字段中键入。我无法使视图成为第一响应者,我如何才能使其成为可能?

代码如下:

import UIKit

class ViewController: UIViewController, UITextFieldDelegate {

    @IBOutlet weak var searchBar: UITextField!
    var isKeyboardShowing:Bool = true
    var viewTapped:UITapGestureRecognizer = UITapGestureRecognizer()

    override func viewDidLoad() {
        super.viewDidLoad()
        searchBar.bottomAnchor.constraint(equalTo: self.view.bottomAnchor, constant: -500).isActive = true
        viewTapped = UITapGestureRecognizer(target: self, action: #selector(viewWasTapped))
        self.view.addGestureRecognizer(viewTapped)


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

    override func viewWillAppear(_ animated: Bool) {
        self.searchBar.resignFirstResponder()
        self.view.becomeFirstResponder()
        print("Can the view be the first responder: \(self.view.canBecomeFirstResponder)")
        print("the searchbar is the first responder: \(searchBar.isFirstResponder)")
        print("the view is the first responder: \(self.view.isFirstResponder)")
    }

    @objc func viewWasTapped(){
    print("The view was tapped")
        if isKeyboardShowing{
            view.endEditing(true)
        }
        else{

        }
    }

    @objc func keyboardWillShow(notification: NSNotification) {
        print("keyboardWillShow")
    }

    @objc func keyboardWillHide(notification: NSNotification){
        print("keyboardWillHide")
    }

}

1 回复 | 直到 7 年前

1

2

rmaddy 7 年前

你不想做 self.view 第一反应者。你想做 searchBar 第一反应者。

没有理由打电话来 resignFirstResponder 如果你要打电话 becomeFirstResponder 在另一个视图上。

class ViewController: UIViewController, UITextFieldDelegate {
    @IBOutlet weak var searchBar: UITextField!

    override func viewDidLoad() {
        super.viewDidLoad()

        searchBar.bottomAnchor.constraint(equalTo: self.view.bottomAnchor, constant: -500).isActive = true
        searchBar.delegate = self

        let viewTapped = UITapGestureRecognizer(target: self, action: #selector(viewWasTapped))
        self.view.addGestureRecognizer(viewTapped)

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

    override func viewWillAppear(_ animated: Bool) {
        searchBar.becomeFirstResponder()

        print("Can the view be the first responder: \(self.view.canBecomeFirstResponder)")
        print("the searchbar is the first responder: \(searchBar.isFirstResponder)")
        print("the view is the first responder: \(self.view.isFirstResponder)")
    }

    @objc func viewWasTapped(){
        print("The view was tapped")
        if searchBar.isFirstResponder {
            searchBar.resignFirstResponder()
        } else{
            searchBar.becomeFirstResponder()
        }
    }

也, 搜索条 不是一个 UITextField .

不需要 viewTapped 成为一种财产。使其成为局部变量。

不需要 isKeyboardShowing 属性。