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我想从使用 MKLocalSearch 检索的这个 NSDictionary 中返回“star_rating”的值。在我将valueForKeyPath:@"business"应用到它之后，返回的字典看起来像这样。

UID = 8094514780070527910;
URL = "http://www.uvm.edu";
attribution =     (
            {
        attributionURLs =             (
            "yelp5.3:///biz/university-of-vermont-burlington",
            "yelp4:///biz/university-of-vermont-burlington",
            "yelp:///biz/university-of-vermont-burlington",
            "http://yelp.com/biz/university-of-vermont-burlington"
        );
        sourceIdentifier = "com.yelp";
        sourceVersion = 1;
    }
);
canBeCorrectedByBusinessOwner = 1;
name = "The University of Vermont";
source =     (
            {
        "source_id" = 647659235;
        "source_name" = "geo_id";
    },
            {
        "source_id" = dBeQ7Nq1LcngfTz7gKrjLA;
        "source_name" = yelp;
    },
            {
        "source_id" = A3H0613898;
        "source_name" = "acxiom_us";
    },
            {
        "source_id" = A1L0080070;
        "source_name" = "acxiom_us";
    },
            {
        "source_id" = A3H0614039;
        "source_name" = "acxiom_us";
    },
            {
        "source_id" = "university-of-vermont-burlington";
        "source_name" = "yelp_alias";
    }
);
"star_rating" =     (
    "4.5"
);
telephone = "+18026563131";}

我的代码：

            MKMapItem *firstMapItem = [response.mapItems objectAtIndex:0];

            NSDictionary *bizdic = [firstMapItem valueForKeyPath:@"business"];

            NSLog(@"%@", bizdic);

            //Problem Occurs Here 
            NSLog(@"%@", [bizdic valueForKeyPath:@"\"star_rating\""]);

每次我将“star_rating”的值打印到控制台时，应用程序都会崩溃并产生以下错误：

    *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<GEOBusiness 0x160c5f20> valueForUndefinedKey:]: this class is not key value coding-compliant for the key "star_rating".'

如果我使用像电话这样的值而不是“star_rating”，它会返回电话号码没有问题。这是我第一次使用 MKLocalSearch，因此感谢任何建议。

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