如何在 viewDidLoad 上的 Swift 中显示没有 UITextField 的标准数字键盘

Posted 2023-03-13

【中文标题】如何在 viewDidLoad 上的 Swift 中显示没有 UITextField 的标准数字键盘

【英文标题】：How to show the standard number keyboard without a UITextField in Swift on viewDidLoad

【发布时间】：2021-01-31 23:45:41

【问题描述】：

我试图在用户访问我的ViewController 时显示标准的数字键盘，并且能够捕获用户的输入以在用户每次输入数字时填充 UI 上的一些圆圈，圆圈问题是我在this question 上显示的问题。

我该怎么做？我已经阅读的所有问题都建议使用UIKeyInput 协议来显示自定义键盘，但这不是我想要做的。其中之一是this one。

我想出的代码，在检查了上面的帖子之后，就是这个，但是经过大量阅读和讨论后，这是为了将上面的 UIView 作为我的自定义键盘，我不确定如何制作没错。

---

视图控制器

import UIKit

class ViewController: UIViewController 
    @IBOutlet weak var dotsView: DotsView!
    
    var keyInputView: KeyInputView = KeyInputView()
    
    override func viewDidLoad() 
        super.viewDidLoad()
        
        keyInputView.inputView = dotsView
        keyInputView.becomeFirstResponder()
        //self.view.addSubview(keyInputView) //In the XIB, the view is set to be displayed in center vertically and horizontally. If we uncomment this line, the view is pushed downwards.
    

DotsView

import UIKit

class DotsView: UIView 
    @IBOutlet var contentView: UIView!
    @IBOutlet weak var titleLabel: UILabel!
    @IBOutlet var digitDots: [CircleView]!
    
    //initWithFrame to init view from code
    override init(frame: CGRect) 
        super.init(frame: frame)
        setupView()
    
      
    //initWithCode to init view from xib or storyboard
    required init?(coder aDecoder: NSCoder) 
        super.init(coder: aDecoder)
        setupView()
    
      
    //common func to init our view
    private func setupView() 
        Bundle.main.loadNibNamed("DotsView", owner: self, options: nil)
        addSubview(contentView)
        contentView.frame = self.bounds
        contentView.autoresizingMask = [.flexibleHeight, .flexibleWidth]
    

圆形视图

import UIKit

@IBDesignable
class CircleView: UIView 
    private var shapeLayer = CAShapeLayer()
    @IBInspectable var fillColor: UIColor = .blue 
        didSet 
            shapeLayer.fillColor = fillColor.cgColor
        
    

    override init(frame: CGRect = .zero) 
        super.init(frame: frame)

        configure()
    

    required init?(coder aDecoder: NSCoder) 
        super.init(coder: aDecoder)

        configure()
    

    private func configure() 
        shapeLayer.fillColor = fillColor.cgColor
        layer.addSublayer(shapeLayer)
    

    override func layoutSubviews() 
        super.layoutSubviews()

        shapeLayer.path = UIBezierPath(ovalIn: bounds).cgPath
    

KeyInputView

import UIKit

class KeyInputView: UIView 
   var _inputView: UIView?

   override var canBecomeFirstResponder: Bool  return true 
   override var canResignFirstResponder: Bool  return true 

   override var inputView: UIView? 
       set  _inputView = newValue 
       get  return _inputView 
   


// MARK: - UIKeyInput
//Modify if need more functionality
extension KeyInputView: UIKeyInput 
    var hasText: Bool 
        return false
    
    
    func insertText(_ text: String) 
        
    
    
    func deleteBackward() 
        
    

至于XIB，您可以在this repo访问它们

【参考方案1】：

您可能想让您的 DotsView 符合 UIKeyInput...

class DotsView: UIView, UIKeyInput 
    
    @IBOutlet var contentView: UIView!
    @IBOutlet weak var titleLabel: UILabel!
    @IBOutlet var digitDots: [CircleView]!
    
    //initWithFrame to init view from code
    override init(frame: CGRect) 
        super.init(frame: frame)
        setupView()
    
      
    //initWithCode to init view from xib or storyboard
    required init?(coder aDecoder: NSCoder) 
        super.init(coder: aDecoder)
        setupView()
    
      
    //common func to init our view
    private func setupView() 
        Bundle.main.loadNibNamed("DotsView", owner: self, options: nil)
        addSubview(contentView)
        contentView.frame = self.bounds
        contentView.autoresizingMask = [.flexibleHeight, .flexibleWidth]
    

    var keyboardType: UIKeyboardType 
        get 
            return .numberPad
        
        set 
    

    // required by UIKeyInput protocol
    var hasText: Bool = false

    override var canBecomeFirstResponder: Bool 
        true
    
    
    func insertText(_ text: String) 
        print("Number tapped:", text)
        // do something with the number that was tapped
    
    
    func deleteBackward() 
        print("Delete Backward tapped")
        // do something because Delete was tapped
    

然后将ViewController中的viewDidLoad()更改为：

override func viewDidLoad() 
    super.viewDidLoad()
    dotsView.becomeFirstResponder()

现在，您不需要额外的KeyInputView。

【讨论】：

这个可行，我只是在尝试您的解决方案后忘记切换键盘