禁用emoji表情

#pragma mark - UITextView delegate
- ( BOOL )textView:( UITextView *)textView shouldChangeTextInRange:( NSRange )range replacementText:( NSString *)text
{
    if ([[[ UITextInputMode currentInputMode ] primaryLanguage ] isEqualToString : @"emoji" ]) {
        [ self showHUDInWindowJustWithText : @" 不能使用 emoji 表情 " disMissAfterDelay : 1.0 ];
        return NO ;

    }

    return YES ;

}

[ UITextInputMode currentInputMode ] primaryLanguage ] 被废弃了。可以使用 [textField. textInputMode primaryLanguage ]这种写法。PS:后一种写法貌似不好使。

查看字符串中是否包含emoji表情

// 判断是否有 emoji
- ( 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 ];
                                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 {
                                    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;

}