文本输入禁止Emoji表情

发送文本时，筛选禁止发送Emoji表情（乱写的）

- (void)viewDidLoad {
    [super viewDidLoad];
    view = [[UITextView alloc]initWithFrame:CGRectMake(100, 100, 200, 200)];
    view.backgroundColor = [UIColor redColor];
    view.delegate = self;
    [self.view addSubview:view];
}

- (void)textViewDidChange:(UITextView *)textView{
    NSRange textRange = [textView selectedRange];
    [view setText:[self disable_emoji:[textView text]]];
    [view 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];
    [self stringIsEmoji];
    modifiedString = [regex stringByReplacingMatchesInString:text
                                                               options:0
                                                                 range:NSMakeRange(0, [text length])
                                                withTemplate:@""];
    return modifiedString;
}

-(void)stringIsEmoji{
    NSString *string = view.text;
    NSInteger strLength = string.length;
    if (strLength){
        for (NSInteger i = 0; i < strLength; i ++){
            if (i < strLength - 1){
                NSString *tempStr = [string substringWithRange:NSMakeRange(i, 2)];
                if ([self stringContainsEmoji:tempStr]){
                    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"发布失败，暂不支持Emoji表情" message:@"hehe" delegate:nil cancelButtonTitle:@"hehe" otherButtonTitles:nil, nil];
                    [alert show];
                    break;
                }
            }else{
                //                [self publishInformation];
            }
            
        }
    }
}

-(BOOL)stringContainsEmoji:(NSString *)string
{
    __block BOOL returnValue = NO;
    [string enumerateSubstringsInRange:NSMakeRange(0, [string length]) options:NSStringEnumerationByComposedCharacterSequences usingBlock:
     ^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop)
     {
         const unichar hs = [substring characterAtIndex:0];
         // surrogate pair
         if (0xd800 <= hs && hs <= 0xdbff)
         {
             if (substring.length > 1)
             {
                 const unichar ls = [substring characterAtIndex:1];
                 const int uc = ((hs - 0xd800) * 0x400) + (ls - 0xdc00) + 0x10000;
                 if (0x1d000 <= uc && uc <= 0x1f77f)
                 {
                     returnValue = YES;
                 }
             }
         }
         else if (substring.length > 1)
         {
             const unichar ls = [substring characterAtIndex:1];
             if (ls == 0x20e3)
             {
                 returnValue = YES;
             }
         }
         else
         {
             // non surrogate
             if (0x2100 <= hs && hs <= 0x27ff)
             {
                 returnValue = YES;
             }
             else if (0x2B05 <= hs && hs <= 0x2b07)
             {
                 returnValue = YES;
             }
             else if (0x2934 <= hs && hs <= 0x2935)
             {
                 returnValue = YES;
             }
             else if (0x3297 <= hs && hs <= 0x3299)
             {
                 returnValue = YES;
             }
             else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50)
             {
                 returnValue = YES;
             }
         }
     }];
    return returnValue;
}