Ios UITextView剩余字符

如何为

UITextView

设置

UILabel

上剩余的字符

我已经为

UITextField

执行了此操作，但相同的代码不起作用

这就是我尝试过的：

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
    }

有什么建议吗？

试试这个

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
    }
}

导入UIKit
类ViewController:UITextViewDelegate{
设maxLenghth=200
func textViewDidChange（textView:UITextView）{
countLabel.text=“\（maxLength-textView.text.count）”
}
func textView（textView:UITextView，shouldChangeTextIn范围：NSRange，replacementText:String）->Bool{
返回textView.text.count+（text.count-range.length）Swift 5

extension AddProperty2ViewController: UITextViewDelegate {

    func textViewDidChange(_ textView: UITextView) {
        p_summary_line_textview.text = "\(5000 - textView.text.count)"
    }


    func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
        return textView.text.count + (text.count - range.length) <= 5000
    }

}

扩展插件AddProperty2ViewController:UITextViewDelegate{
func textViewDidChange（textView:UITextView）{
p_summary_line_textview.text=“\（5000-textview.text.count）”
}
func textView（textView:UITextView，shouldChangeTextIn范围：NSRange，replacementText:String）->Bool{
返回textView.text.count+（text.count-range.length）
func textViewDidBeginEditing（\utextView:UITextView）{
收缩文本（）
}
func textViewDidChange（textView:UITextView）{
收缩文本（）
}
func textViewDidEndEditing（uTEXTVIEW:UITextView）{
收缩文本（）
}
func收缩文本（）{
sendButton.isEnabled=reviewTextField.text==“”？false:true
var text=“”
变量计数器=0
如果reviewTextField.text.count>limit{
reviewTextField.text.forEach{
如果计数器<极限{
计数器+=1
text.append（$0）
}否则{
返回
}
}
reviewTextField.text=文本
}
counterLabel.text=“\（reviewTextField.text.count）/\（限制）”
}
请提供您拥有的代码tried@user4261201-更新的问题。你的最大字符数限制是多少？@Anbu.Karthik最大字符数限制是200。@Learn2Code-用这个遗嘱，我没有深入了解，检查这个
func textViewDidBeginEditing(_ textView: UITextView) {
    shrinkText()
}

func textViewDidChange(_ textView: UITextView) {
    shrinkText()
}

func textViewDidEndEditing(_ textView: UITextView) {
    shrinkText()
}


func shrinkText() {
    sendButton.isEnabled = reviewTextField.text == "" ? false : true
    
    var text = ""
    var counter = 0
    
    if reviewTextField.text.count > limit {
        reviewTextField.text.forEach {
            if counter < limit {
                counter += 1
                text.append($0)
            } else {
                return
            }
        }
        reviewTextField.text = text
    }
    counterLabel.text = "\(reviewTextField.text.count) / \(limit)"
}