禁止系统emoji表情的输入

在开发中,可能会遇到服务器后台数据库不能识别IOS系统表情,导致存储出错的问题,所以就需要禁止系统emoji表情的输入,代码如下:

- (void)textViewDidChange:(UITextView *)textView{
    if (textView.text.length > 0) {
    // 禁止系统表情的输入
     NSString *text = [self disable_emoji:[textView text]];
     if (![text isEqualToString:textView.text]) {
         NSRange textRange = [textView selectedRange];
         textView.text = text;
         [textView setSelectedRange:textRange];
       }
    }
}

- (NSString *)disable_emoji:(NSString *)text{
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"[^\\u0020-\\u007E\\u00A0-\\u00BE\\u2E80-\\uA4CF\\uF900-\\uFAFF\\uFE30-\\uFE4F\\uFF00-\\uFFEF\\u0080-\\u009F\\u2000-\\u201f\r\n]"options:NSRegularExpressionCaseInsensitive error:nil];
    NSString *modifiedString = [regex stringByReplacingMatchesInString:text
                                                               options:0
                                                                 range:NSMakeRange(0, [text length])
                                                          withTemplate:@""];
    return modifiedString;
}