试一下代码着色之类的功能

- (BOOL)isEqualsIgnoreCase:(NSString*)toString {
    if (NSOrderedSame == [self compare:toString options:NSCaseInsensitiveSearch])
        return YES;
    return NO;
}

- (BOOL)isEqualsIgnoreCase:(NSString*)toString {
    if (NSOrderedSame == [self compare:toString options:NSCaseInsensitiveSearch])
        return YES;
    return NO;
}

- (BOOL)isEqualsIgnoreCase:(NSString*)toString {
    if (NSOrderedSame == [self compare:toString options:NSCaseInsensitiveSearch])
        return YES;
    return NO;
}

- (BOOL)isEqualsIgnoreCase:(NSString*)toString {
    if (NSOrderedSame == [self compare:toString options:NSCaseInsensitiveSearch])
        return YES;
    return NO;
}

- (NSString *)urlEncode {
    return [self stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
}