据说能unicode转化为UTF8，自己没试，用到了再说了

NSString*yourString ="\u043F\u0440\u0438\u043A\u043E\u043B\u044B";
NSArray*unicodeArray =[yourString componentsSeparatedByString:@"\\u"];
NSMutableString*finalString =[[NSMutableString alloc] initWithString:@""];
for(NSString*unicodeString in unicodeArray){
    if(![unicodeString isEqualToString:@""]){
        unichar codeValue;
        [[NSScanner scannerWithString:unicodeString] scanHexInt:&codeValue];
        NSString* betaString =[NSString stringWithCharacters:&codeValue length:1];
        [finalString appendString:betaString];
    }
}