删除Emoji Bug

Question

我遵循这个链接找出字符串中的字符是否是表情符号？试图限制字符的数量，我的文本字段，甚至使用表情。根据这个链接，我必须根据他们的字形来计数表情符号，除了一个小错误之外，所有的东西都在工作，当我的字形计数到达时，它就不再允许我删除字符串了。

下面是使用UITextField代理处理字符限制的代码

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {

var canEditString : Bool = false

if textField == self.descTxtField {

    // Description Text Field
    if textField.text != nil || textField.text != "" {

        let currentString = textField.text
        if (currentString?.containsEmoji)! {
            print("I have an emoji")
            let glyphCount = currentString!.glyphCount
            print(glyphCount)
            canEditString = glyphCount <= descriptionLimit
        }else {
            print("I have no emoji's")
            let currentCharacterCount = textField.text?.characters.count ?? 0
            //print(currentCharacterCount)
            if (range.length + range.location > currentCharacterCount){
                return false
            }
            let newLength = currentCharacterCount + string.characters.count - range.length
            canEditString = newLength <= descriptionLimit
        }
    }
    return canEditString


} else {

    // Number Text Field
    let currentCharacterCount = textField.text?.characters.count ?? 0
    if (range.length + range.location > currentCharacterCount){
        return false
    }
    let newLength = currentCharacterCount + string.characters.count - range.length
    return newLength <= numberLimit
}
}

Answer 1

字符串宣言

Swift 4

表情符号现在有一个字符计数1，使它更容易跟踪字符计数在字符串。