Simple UIKeyInput example

CustomTextInputView.swift

import UIKit

/// A very simple example view that can accept keyboard input and add or delete text from an enclosed label.
class CustomTextInputView : UIControl, UIKeyInput {

  var label : UILabel?

  override func canBecomeFirstResponder() -> Bool {
    return true
  }

  init() {
    super.init(frame: CGRectZero)
    build()
    addTarget(self, action: Selector("onTap:"), forControlEvents: .TouchUpInside)
  }

  @objc private func onTap(_: AnyObject) {
    // When the view is tapped, it becomes the first responder. If the keyboard is not already on screen, it will appear.
    becomeFirstResponder()
  }

  required init(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    build()
    addTarget(self, action: Selector("onTap:"), forControlEvents: .TouchUpInside)
  }

  /// Programmatically create and configure the enclosed label.
  private func build() {
    let lbl = UILabel()
    lbl.setTranslatesAutoresizingMaskIntoConstraints(false)
    lbl.numberOfLines = 0
    addSubview(lbl)
    lbl.font = UIFont(name: "HelveticaNeue-Light", size: 14.0)!

    // Constrain!
    let views = ["lbl": lbl]
    addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("|-[lbl]-|", options: nil, metrics: nil, views: views))
    addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-[lbl]-|", options: nil, metrics: nil, views: views))
    label = lbl
  }


  // MARK: UIKeyInput

  func hasText() -> Bool {
    return label?.text?.isEmpty ?? false
  }

  func insertText(text: String) {
    label?.text = (label?.text ?? "") + text
  }

  func deleteBackward() {
    if let text = label?.text where !text.isEmpty {
      let newText = text[text.startIndex..<text.endIndex.predecessor()]
      label?.text = newText
    }
  }
}

How to change the keyboard to numberPad?
declare a variable in above CustomTextInputView class.
var keyboardType: UIKeyboardType = .numberPad

How to change textContentType to otp

var textContentType: UITextContentType = .oneTimeCode

If you like, you can check this link OneTimeCodeField

Hi,

I am taking input from external device. if I use canBecomeFirstResponder true, keyboard coming on top of the View. is it possible to hide the keyboard?.

here is my code.

class KeyView: UIView, UIKeyInput {

    var badgeStr = ""
    override var canBecomeFirstResponder: Bool {
        true
    }
    var hasText: Bool {
        badgeStr.isEmpty == false
    }
    
    func insertText(_ text: String) {
            badgeStr += text
        if badgeStr.count == 1 {
            DispatchQueue.main.asyncAfter(deadline: .now() + 2) {
                if self.badgeStr.count > 3 {
                    self.enteredBadge!(self.badgeStr)
                }
                self.badgeStr = ""
                self.hasEnter = false
            }
        }
    }
    
    func deleteBackward() {
        _ = badgeStr.popLast()
    }
}