RIchEditorView with Max Character Count Functionality (HTML) and Cursor Floating Under Keyboard on focus Temporary Fix (Swift 4 and 5)

RichEditorViewController.swift

import UIKit
import RichEditorView. // TODO: Download https://github.com/cbess/RichEditorView for Swift 5 support

class EditorViewController: UIViewController, RichEditorDelegate {
    
    let editorView = RichEditorView()
    var isEditingText: Bool!
    var initString: String!
    var prevText: String!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)
        editorView.frame = CGRect(x: 0, y: 0, width: self.view.bounds.width, height: self.view.bounds.height)
        editorView.setEditorBackgroundColor(.green)
        editorView.delegate = self
        editorView.placeholder = "Type some stuff out. Don't be afraid."
        if isEditingText != nil { // Designed so that RichEditorView can be used for editing or only for viewing. 
            editorView.isEditingEnabled = isEditingText
        }
        let toolbar = RichEditorToolbar(frame: CGRect(x: 0, y: 0, width: self.view.bounds.width, height: 44))
        toolbar.options = RichEditorDefaultOption.all
        toolbar.editor = editorView
        editorView.inputAccessoryView = toolbar
        view.backgroundColor = .white
        view.addSubview(editorView)
        if initString == nil {editorView.html = ""} else {editorView.html = initString}
    }
    // MARK: Reframe the editor so that the cursor does not float underneath the keyboard
    @objc func keyboardWillShow(notification: NSNotification) {
        // TODO: Add navigation DONE button to unFocus
        if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
            let keyboardHeight = keyboardSize.height
            editorView.frame = CGRect(x: 0, y: 0, width: self.view.bounds.width, height: self.view.bounds.height - 60 - keyboardHeight)
        }
    }
    
    @objc func richEditor(_ editor: RichEditorView, contentDidChange content: String) {
        if editor.isFocused {
        if content.count > 20 {
            editor.html = prevText
            // print("Stop") This was for testing. The 20 is the max number of characters in HTML, not the visible string.
        } else {
            // print(content)
            prevText = content
        }}
    }

}

Sorry, this was a simple copy and paste. The gist was mainly designed for the Max Character count functionality. There is also an issue with the cursor going underneath the keyboard due to framing, and I made a temporary fix because I can only assume what the frame size of an iPhone vs. iPad could be. cjwirth/RichEditorView#212

This should work for both storyboard and programmatically (this editor was made programmatically).