IOS Uitextfeild Get the length of the highlighted part

Get Reason:

When mixing in English and Chinese, you will encounter the problem of inaccurate length statistics.

Get method:

 NSString *toBeString = textField.text;   NSString *lang = [[UITextInputMode currentInputMode] primaryLanguage]; // 键盘输入模式   if ([lang isEqualToString:@"zh-Hans"]) { // 简体中文输入，包括简体拼音，健体五笔，简体手写       UITextRange *selectedRange = [textField markedTextRange];       //获取高亮部分       UITextPosition *position = [textField positionFromPosition:selectedRange.start offset:0];       // 没有高亮选择的字，则对已输入的文字进行字数统计和限制       if (!position) {           if (toBeString.length > kMaxLength) {               textField.text = [toBeString substringToIndex:kMaxLength];           }       }       // 有高亮选择的字符串，则暂不对文字进行统计和限制       else{       }   }   // 中文输入法以外的直接对其统计限制即可，不考虑其他语种情况   else{       if (toBeString.length > kMaxLength) {           textField.text = [toBeString substringToIndex:kMaxLength];       }   }

IOS Uitextfeild Get the length of the highlighted part