Limit Number of Characters in Uitextview

Limit number of characters in uitextview

You should be looking for an empty string instead, as the apple reference says

If the user presses the Delete key, the length of the range is 1 and an empty string object replaces that single character.

I think the check you actually want to make is something like [[textView text] length] - range.length + text.length > 140, to account for cut/paste operations.

Setting maximum number of characters of `UITextView ` and `UITextField `

Update Swift 4.X

func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
    let newText = (textView.text as NSString).replacingCharacters(in: range, with: text)
    let numberOfChars = newText.count
    return numberOfChars < 10    // 10 Limit Value
}

Try this out:

func textView(textView: UITextView, shouldChangeTextInRange range: NSRange, replacementText text: String) -> Bool {
    let newText = (textView.text as NSString).stringByReplacingCharactersInRange(range, withString: text)
    let numberOfChars = newText.characters.count // for Swift use count(newText)
    return numberOfChars < 10;
}

How to limit characters in UITextView iOS

1) add UITextViewDelegate in your viewcontroller like this

@interface ViewController : UIViewController <UITextViewDelegate>

Each time a user types a character on the keyboard, just before the character is displayed,following method get called. This is a handy location to test the characters that a user is typing and disallow specific characters you want to restrict.

textView:shouldChangeCharactersInRange:replacementString

2) then write following code.
instead of 140 you can put whatever number you want.

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
    return textView.text.length + (text.length - range.length) <= 140;
}

For more help take a look at UItextView

Swift 2.0 solution

 func textView(textView: UITextView, shouldChangeTextInRange range: NSRange, replacementText text: String) -> Bool {
    return textView.text.characters.count + (text.characters.count - range.length) <= textViewLimit
}

UITextView characters remaining

try this

import UIKit

class ViewController: UITextViewDelegate {
    let maxLenghth = 200
    
    func textViewDidChange(_ textView: UITextView) {
        countLabel.text = "\(maxLength - textView.text.count)"
    }
    
    func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
        return textView.text.count + (text.count - range.length) <= maxLength
    }
}

Swift - Limit the number of characters in lines for UITextview

Implement shouldChangeTextIn and return false if any line has more than the allowed number of characters:

    func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
        let maxAllowedCharactersPerLine = 10
        let lines = (textView.text as NSString).replacingCharacters(in: range, with: text).components(separatedBy: .newlines)
        for line in lines {
            if line.characters.count > maxAllowedCharactersPerLine {
                return false
            }
        }
        return true
    }

Limit the number of Characters for an IBOutlet TextView, Swift

Please have a look of below question

Set the maximum character length of a UITextField (In my answer you can also see for UITextView)

Instead of writing duplicate code everywhere, You can create an extension of UITextView or UITextField to set the max length

Update:

Comment Explanation:

First thing, You need to remove the UITextView delegate method from your current view controller. Because extension of UITextView is internally used UITextViewDelegate

Note: Delegate is one to one communication. In your case, if you implement delegate in the current view controller then an extension of UITextView is not worked.

UITextView limit characters and display count left

If you look closely at the docs for UITextViewDelegate, you will see that textViewDidChange is defined like this:

optional func textViewDidChange(_ textView: UITextView)

Look at the parameter! It requires a parameter with an external parameter name of _!

Look what you've written:

func textViewDidChange(textView: TextViewX)

Your parameter's external name is textView!

This is why it does not work.

So, just add _ and a space before textView and change the type of the parameter to UITextView.

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