UITextField有高亮字符的情况下如何控制字符输入个数

来源：互联网发布：乐视vr 没数据编辑：程序博客网时间：2024/06/08 16:02

func getTextFieldText(with str: String?) -> String?{    //最大字符个数为10    guard let s = str, s.characters.count > 10 else {        return str    }    let startIndex = str!.startIndex    let endIndex = str!.index(str!.startIndex, offsetBy: maxLen)    return str?.substring(with: startIndex ..< endIndex)}//绑定到valueChanged事件func textFieldValueChanged(textField: UITextField){    let textStr = textField.text    let lang = UIApplication.shared.textInputMode?.primaryLanguage    if lang == "zh-Hans" || lang == "zh-Hant" {        let selectedRange = textField.markedTextRange        guard selectedRange != nil else{            textField.text = self.getTextFieldText(with: textStr)            return        }        let position = textField.position(from: selectedRange!.start, offset: 0)        guard position != nil else {            textField.text = self.getTextFieldText(with: textStr)            return        }    }else{        textField.text = self.getTextFieldText(with: textStr)    }}

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