iOS EMoji表情过滤

第一种：// 限制苹果系统输入法 禁止输入表情

if ([[[UITextInputMode currentInputMode]primaryLanguage] isEqualToString:@"emoji"]) {
        [SVProgressHUD setMinimumDismissTimeInterval:1];
        [SVProgressHUD showErrorWithStatus:@"不支持表情输入"];
        return NO;
    }

第二种： iOS中Emoji表情的判断

可以封装在分类NSString中，直接使用

/**
*  iOS中Emoji表情的判断
*/
+ (BOOL)stringContainsEmoji:(NSString *)string
{
    // 过滤所有表情。returnValue为NO表示不含有表情，YES表示含有表情
    __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;
}

使用场景
注：SVProgressHUD为一非常优秀的状态框架
SVProgressHUD使用方法

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
    //   限制苹果系统输入法  禁止输入表情
    if ([[[UITextInputMode currentInputMode]primaryLanguage] isEqualToString:@"emoji"]) {
        [SVProgressHUD setMinimumDismissTimeInterval:1];
        [SVProgressHUD showErrorWithStatus:@"不支持表情输入"];
        return NO;
    }
    
    //禁止输入emoji表情
    if ([NSString stringContainsEmoji:self.inputCommentTextView.text]) {
        [SVProgressHUD setMinimumDismissTimeInterval:2];
        [SVProgressHUD showErrorWithStatus:@"不支持表情输入,发送将会失败"];
    }
    
    return YES;
}

勤学如早春之苗，不见其增，日有所涨。
辍学如磨刀之石，不见其减，日有所损。