[IOS]字符串判断、移除emoji表情

使用方法：

  NSString *testString=@"？西瓜？苹果？橘子";
    NSString *testStringno=@"西瓜苹果橘子";
    NSLog(@"%@",testString);
    NSLog(@"%@",testStringno);
    BOOL isIncludingEmoji = [testString isIncludingEmoji];
    BOOL isIncludingEmoji2 = [testStringno isIncludingEmoji];
    NSLog(@"%d",isIncludingEmoji);
    NSLog(@"%d",isIncludingEmoji2);
    NSString* removedEmoji = [testString removedEmojiString];
    NSLog(@"%@",removedEmoji);

————————————————————添加方法——————————————

//头文件
#import 

@interface NSString (RemoveEmoji)

- (BOOL)isIncludingEmoji;

- (instancetype)removedEmojiString;

@end

#import "NSString+RemoveEmoji.h"

@implementation NSString (RemoveEmoji)

- (BOOL)isEmoji {
    const unichar high = [self characterAtIndex: 0];
    
    // Surrogate pair (U+1D000-1F77F)
    if (0xd800 <= high && high <= 0xdbff) {
        const unichar low = [self characterAtIndex: 1];
        const int codepoint = ((high - 0xd800) * 0x400) + (low - 0xdc00) + 0x10000;
        
        return (0x1d000 <= codepoint && codepoint <= 0x1f77f);
        
    // Not surrogate pair (U+2100-27BF)
    } else {
        return (0x2100 <= high && high <= 0x27bf);
    }
}

- (BOOL)isIncludingEmoji {
    BOOL __block result = NO;
    
    [self enumerateSubstringsInRange:NSMakeRange(0, [self length])
                             options:NSStringEnumerationByComposedCharacterSequences
                          usingBlock: ^(NSString* substring, NSRange substringRange, NSRange enclosingRange, BOOL* stop) {
        if ([substring isEmoji]) {
            *stop = YES;
            result = YES;
        }
    }];
    
    return result;
}

- (instancetype)removedEmojiString {
    NSMutableString* __block buffer = [NSMutableString stringWithCapacity:[self length]];
    
    [self enumerateSubstringsInRange:NSMakeRange(0, [self length])
                             options:NSStringEnumerationByComposedCharacterSequences
                          usingBlock: ^(NSString* substring, NSRange substringRange, NSRange enclosingRange, BOOL* stop) {
        [buffer appendString:([substring isEmoji])? @"": substring];
    }];
    
    return buffer;
}

@end

附上地址:https://github.com/woxtu/NSString-RemoveEmoji  

网速差的同学就看看我的吧：）