因为emoji编码在android或者pc设备没有很好的支持，所以有时候为了禁止emoji表情的输入，因为关闭不了系统emoji的键盘，那只能根据编码把emoji表情过滤掉，写了一个NSString的拓展，用来判断是不是emoji编码：

@implementation NSString(Emoji)

+(BOOL)isContainsEmoji:(NSString *)string {

__block BOOL isEomji = NO;

[string enumerateSubstringsInRange:NSMakeRange(0, [string length]) options:NSStringEnumerationByComposedCharacterSequencesusingBlock:

^(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) {

isEomji = YES;

}

}

} else if (substring.length > 1) {

const unichar ls = [substring characterAtIndex:1];

if (ls == 0x20e3) {

isEomji = YES;

}

} else {

// non surrogate

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;

}

这样在textview或textfield的delegate判断一下，即可禁止输入emoji，如下：

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string

{

//emoji无效

if([NSString isContainsEmoji:string])

{

return NO;

}

}

当然，最好的方法还是做一套emoji的编码解码，以支持其他非ios设备。不然禁止这个功能有点说不过去。