iOS之禁止所有输入法的表情

- (bool)textview:(uitextview *)textview shouldchangetextinrange:(nsrange)range replacementtext:(nsstring *)text {
    //禁止所有输入法的表情
    if ([self iscontainstwoemoji:text]) {
        return no;
    }
    return yes;
}

//判断是否是表情字符

- (bool)iscontainstwoemoji:(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];
         //         nslog(@"hs++++++++%04x",hs);
         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;
                 }
                 //                 nslog(@"uc++++++++%04x",uc);
             }
         } else if (substring.length > 1) {
             const unichar ls = [substring characteratindex:1];
             if (ls == 0x20e3|| ls ==0xfe0f) {
                 iseomji = yes;
             }
             //             nslog(@"ls++++++++%04x",ls);
         } 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;
}