UITextView 剩余字符数

Question

如何设置残留在人物UILabel的UITextView？

我已经为UITextField，但同样的代码不起作用..

这是我尝试过的：

func textView(textView: UITextView, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool
 {
        if string == ""
        {
            if plainTextView.text!.characters.count == 0
            {
                charCount = 0
                countLabel.text = String(format: "%i Characters Left", maxLength - charCount)
                return false
            }
            charCount = (plainTextView.text!.characters.count - 1)
            countLabel.text = String(format: "%i Characters Left", maxLength - charCount)
            return true
        }
        else
        {
            charCount = (plainTextView.text!.characters.count + 1)
            countLabel.text = String(format: "%i Characters Left", maxLength - charCount)

            if charCount >= maxLength + 1
            {
                charCount = maxLength
                countLabel.text = String(format: "%i Characters Left", maxLength - charCount)
                return false;
            }
        }
        return true
    }

有什么建议？

Answer 1

尝试这个

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
    }
}