有时候在开发时会遇到不希望字符串中包含emoji表情的情况，Google之后发现了方法，但是似乎iOS9之后的emoji无法过滤，继续寻找方法，在一个NSString的扩展中发现了办法

#import <Foundation/Foundation.h>/**Category to search emojis on an NSString.The category allows to check if has emojis, the number of emojis and the range of the emojis.*/
@interface NSString (EMOEmoji)/**Calculate the NSRange for every emoji on the string.@return array with the range for every emoji.*/
- (NSArray *)emo_emojiRanges;/**Calculate if the string has any emoji.@return YES if the string has emojis, No otherwise.*/
- (BOOL)emo_containsEmoji;/**Calculate if the string consists entirely of emoji.@return YES if the string consists entirely of emoji, No otherwise.*/
- (BOOL)emo_isPureEmojiString;/**Calculate number of emojis on the string.@return the total number of emojis.*/
- (NSInteger)emo_emojiCount;@end

<pre name="code" class="objc">#import "NSString+EMOEmoji.h"@implementation NSString (EMOEmoji)#pragma mark - EmojiRanges- (NSArray *)emo_emojiRanges
{__block NSMutableArray *emojiRangesArray = [NSMutableArray new];[self enumerateSubstringsInRange:NSMakeRange(0,[self length])options:NSStringEnumerationByComposedCharacterSequencesusingBlock:^(NSString *substring,NSRange substringRange,NSRange enclosingRange,BOOL *stop){const unichar hs = [substring characterAtIndex:0];// surrogate pairif (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 <= 0x1f9c0){[emojiRangesArray addObject:[NSValue valueWithRange:substringRange]];}}}else if (substring.length > 1){const unichar ls = [substring characterAtIndex:1];if (ls == 0x20e3 ||ls == 0xfe0f ||ls == 0xd83c){[emojiRangesArray addObject:[NSValue valueWithRange:substringRange]];}}else{// non surrogateif (0x2100 <= hs &&hs <= 0x27ff){[emojiRangesArray addObject:[NSValue valueWithRange:substringRange]];}else if (0x2B05 <= hs &&hs <= 0x2b07){[emojiRangesArray addObject:[NSValue valueWithRange:substringRange]];}else if (0x2934 <= hs &&hs <= 0x2935){[emojiRangesArray addObject:[NSValue valueWithRange:substringRange]];}else if (0x3297 <= hs &&hs <= 0x3299){[emojiRangesArray addObject:[NSValue valueWithRange:substringRange]];}else if (hs == 0xa9 ||hs == 0xae ||hs == 0x303d ||hs == 0x3030 ||hs == 0x2b55 ||hs == 0x2b1c ||hs == 0x2b1b ||hs == 0x2b50){[emojiRangesArray addObject:[NSValue valueWithRange:substringRange]];}}}];return emojiRangesArray;
}#pragma mark - ContainsEmoji- (BOOL)emo_containsEmoji
{__block BOOL containsEmoji = NO;[self enumerateSubstringsInRange:NSMakeRange(0,[self length])options:NSStringEnumerationByComposedCharacterSequencesusingBlock:^(NSString *substring,NSRange substringRange,NSRange enclosingRange,BOOL *stop){const unichar hs = [substring characterAtIndex:0];// surrogate pairif (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 <= 0x1f9c0){containsEmoji = YES;}}}else if (substring.length > 1){const unichar ls = [substring characterAtIndex:1];if (ls == 0x20e3 ||ls == 0xfe0f ||ls == 0xd83c){containsEmoji = YES;}}else{// non surrogateif (0x2100 <= hs &&hs <= 0x27ff){containsEmoji = YES;}else if (0x2B05 <= hs &&hs <= 0x2b07){containsEmoji = YES;}else if (0x2934 <= hs &&hs <= 0x2935){containsEmoji = YES;}else if (0x3297 <= hs &&hs <= 0x3299){containsEmoji = YES;}else if (hs == 0xa9 ||hs == 0xae ||hs == 0x303d ||hs == 0x3030 ||hs == 0x2b55 ||hs == 0x2b1c ||hs == 0x2b1b ||hs == 0x2b50){containsEmoji = YES;}}if (containsEmoji){*stop = YES;}}];return containsEmoji;
}#pragma mark - PureEmojiString- (BOOL)emo_isPureEmojiString
{if (self.length == 0) {return NO;}__block BOOL isPureEmojiString = YES;[self enumerateSubstringsInRange:NSMakeRange(0,[self length])options:NSStringEnumerationByComposedCharacterSequencesusingBlock:^(NSString *substring,NSRange substringRange,NSRange enclosingRange,BOOL *stop){BOOL containsEmoji = NO;const unichar hs = [substring characterAtIndex:0];// surrogate pairif (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 <= 0x1f9c0){containsEmoji = YES;}}}else if (substring.length > 1){const unichar ls = [substring characterAtIndex:1];if (ls == 0x20e3 ||ls == 0xfe0f ||ls == 0xd83c){containsEmoji = YES;}}else{// non surrogateif (0x2100 <= hs &&hs <= 0x27ff){containsEmoji = YES;}else if (0x2B05 <= hs &&hs <= 0x2b07){containsEmoji = YES;}else if (0x2934 <= hs &&hs <= 0x2935){containsEmoji = YES;}else if (0x3297 <= hs &&hs <= 0x3299){containsEmoji = YES;}else if (hs == 0xa9 ||hs == 0xae ||hs == 0x303d ||hs == 0x3030 ||hs == 0x2b55 ||hs == 0x2b1c ||hs == 0x2b1b ||hs == 0x2b50){containsEmoji = YES;}}if (!containsEmoji){isPureEmojiString = NO;*stop = YES;}}];return isPureEmojiString;
}#pragma mark - EmojiCount- (NSInteger)emo_emojiCount
{__block NSInteger emojiCount = 0;[self enumerateSubstringsInRange:NSMakeRange(0,[self length])options:NSStringEnumerationByComposedCharacterSequencesusingBlock:^(NSString *substring,NSRange substringRange,NSRange enclosingRange,BOOL *stop){const unichar hs = [substring characterAtIndex:0];// surrogate pairif (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 <= 0x1f9c0){emojiCount = emojiCount + 1;}}}else if (substring.length > 1){const unichar ls = [substring characterAtIndex:1];if (ls == 0x20e3 ||ls == 0xfe0f ||ls == 0xd83c){emojiCount = emojiCount + 1;}}else{// non surrogateif (0x2100 <= hs &&hs <= 0x27ff){emojiCount = emojiCount + 1;}else if (0x2B05 <= hs &&hs <= 0x2b07){emojiCount = emojiCount + 1;}else if (0x2934 <= hs &&hs <= 0x2935){emojiCount = emojiCount + 1;}else if (0x3297 <= hs &&hs <= 0x3299){emojiCount = emojiCount + 1;}else if (hs == 0xa9 ||hs == 0xae ||hs == 0x303d ||hs == 0x3030 ||hs == 0x2b55 ||hs == 0x2b1c ||hs == 0x2b1b ||hs == 0x2b50){emojiCount = emojiCount + 1;}}}];return emojiCount;
}@end

ps:扩展的链接是https://github.com/woxtu/NSString-RemoveEmoji 感谢作者