Swift 3 - Limit number of characters in uitextview

I am giving a text view to tweet some string .

I am applying the following method to restrict the number of characters to 140 in length.

code in a viewController

import UIKit import SVProgressHUD import Toaster class ViewController: UIViewController , UITextViewDelegate , UITextFieldDelegate { var checktoaster = false @IBOutlet weak var txtDescription: UITextView! func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool { if txtDescription == textView { guard let tex = textView.text else { return true } let newLength = tex.characters.count + text.characters.count - range.length if !(newLength <= 140) { if checktoaster == false { checktoaster = true let toast = Toast(text: "You have write only 140 character.", duration: Delay.long) toast.show() } } else { checktoaster = false } return newLength <= 140 //Bool } return true } } 

here is The textView class

import UIKit public class LetsTextView : UITextView , UITextViewDelegate{ required public init?(coder aDecoder: NSCoder) { super.init(coder: aDecoder) NotificationCenter.default.addObserver(self, selector: #selector(LetsTextView.refreshPlaceholder), name: NSNotification.Name.UITextViewTextDidChange, object: self) } override init(frame: CGRect, textContainer: NSTextContainer?) { super.init(frame: frame, textContainer: textContainer) NotificationCenter.default.addObserver(self, selector: #selector(LetsTextView.refreshPlaceholder), name: NSNotification.Name.UITextViewTextDidChange, object: self) } override public func awakeFromNib() { super.awakeFromNib() NotificationCenter.default.addObserver(self, selector: #selector(LetsTextView.refreshPlaceholder), name: NSNotification.Name.UITextViewTextDidChange, object: self) } deinit { NotificationCenter.default.removeObserver(self) } @IBInspectable public var placeholder : String? { get { return placeholderLabel?.text } set { if placeholderLabel == nil { var frm = self.bounds.insetBy(dx: 5, dy: 6) frm.size.height = 20 placeholderLabel = UILabel(frame:frm) if let unwrappedPlaceholderLabel = placeholderLabel { unwrappedPlaceholderLabel.autoresizingMask = [.flexibleWidth, .flexibleHeight] unwrappedPlaceholderLabel.lineBreakMode = .byWordWrapping unwrappedPlaceholderLabel.numberOfLines = 0 unwrappedPlaceholderLabel.font = self.font unwrappedPlaceholderLabel.backgroundColor = UIColor.clear unwrappedPlaceholderLabel.textColor = UIColor.gray//UIColor(red: 255/255, green: 190/255, blue: 70/255, alpha: 1.0) unwrappedPlaceholderLabel.alpha = 0 addSubview(unwrappedPlaceholderLabel) } } placeholderLabel?.text = newValue refreshPlaceholder() } } func refreshPlaceholder() { if text.characters.count != 0 { placeholderLabel?.alpha = 0 } else { placeholderLabel?.alpha = 1 } } override public var text: String! { didSet { refreshPlaceholder() } } override public var font : UIFont? { didSet { if let unwrappedFont = font { placeholderLabel?.font = unwrappedFont } else { placeholderLabel?.font = UIFont.systemFont(ofSize: 12) } } } override public var delegate : UITextViewDelegate? { get { refreshPlaceholder() return super.delegate } set { } } } 

// Any solution please