ios上禁止输入表情

+ (BOOL)isContainsEmoji:(NSString *)string {    __block BOOL isEomji = 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) {                     isEomji = YES;                 }             }         } else if (substring.length > 1) {             const unichar ls = [substring characterAtIndex:1];             if (ls == 0x20e3) {                 isEomji = YES;             }         } else {             if (0x2100 <= hs && hs <= 0x27ff && hs != 0x263b) {                 isEomji = YES;             } else if (0x2B05 <= hs && hs <= 0x2b07) {                 isEomji = YES;             } else if (0x2934 <= hs && hs <= 0x2935) {                 isEomji = YES;             } else if (0x3297 <= hs && hs <= 0x3299) {                 isEomji = YES;             } else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50|| hs == 0x231a ) {                 isEomji = YES;             }         }     }];    return isEomji;}