# HexEditUITextView

    class HexEditUITextView : UITextView

    extension HexEditUITextView: UITextViewDelegate

Class overriding an UITextView in order to enable hexadecimal input only. It uses a delegate function to check entered text and allows 0~9, space and A~F characters only. Also disabled the autocompletion feature that turns 2 spaces into a dot plus space.

- `init(frame:textContainer:)`

  Override initialiser.

  #### Declaration

  Swift

      override init(frame: CGRect, textContainer: NSTextContainer?)

  #### Parameters

  `frame` | CGRect
  `textContainer` | NSTextContainer

- `init(coder:)`

  Required initialiser.

  #### Declaration

  Swift

      required init?(coder: NSCoder)

  #### Parameters

  `coder` | NSCoder

- `initialise()`

  Sets the delegate and initialises the text view borders

  #### Declaration

  Swift

      private func initialise()

- `textViewDidChange(_:)`

  Tells the delegate when the user changes the text or attributes in the specified text view. Used here to fix the “. ” back to double space

  #### Declaration

  Swift

      func textViewDidChange(_ textView: UITextView)

  #### Parameters

  `textView` | The text view containing the changes.

- `textView(_:shouldChangeTextIn:replacementText:)`

  Asks the delegate whether to replace the specified text in the text view. Used here to check if entered text conforms a characterset holding hexadecimal values + space.

  #### Declaration

  Swift

      func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool

  #### Parameters

  `textView` | The text view containing the changes.
  `range` | The current selection range.
  `text` | The text to insert

  #### Return Value

  True if the old text should be replaced by the new text; false if the replacement operation should be aborted.

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