Question

我创建了一个网络服务,我这样认为。退还的数据类似:

{"invoice":{"id":44,"number":42,"amount":1139.99,"checkoutStarted":true,"checkoutCompleted":true}}

对我来说,这看起来像是有效的智者。

在5世纪里,我使用本土的JSON序列izer,把数据作为NSDictionary。

NSError *error;
    NSDictionary *json = [NSJSONSerialization JSONObjectWithData:[request responseData] options:kNilOptions error:&error];
    NSLog(@"json count: %i, key: %@, value: %@", [json count], [json allKeys], [json allValues]);

记录的产出是:

json count: 1, key: (
    invoice
), value: (
        {
        amount = "1139.99";
        checkoutCompleted = 1;
        checkoutStarted = 1;
        id = 44;
        number = 42;
    }
)

因此,我想到的是,JSON数据具有“发票”关键特性,其价值为NSArray <代码>(imount = ......,eck...})。

因此,我把价值转换为国家航空航天局:

NSArray *latestInvoice = [json objectForKey:@"invoice"];

但是,当步行时,它说,最近的是发票不是非洲法郎。如果我打印阵列中的数值:

for (id data in latestInvoice) {
        NSLog(@"data is %@", data);
    }

结果是:

data is id
data is checkoutStarted
data is ..

我不理解为什么它只归还“id”而不是“id = 44”。如果我把JSON数据确定给NSDictionary,我知道钥匙是NSString,但价值是什么? 是不是国家安全局,还是什么?

This is the tutorial that I read: http://www.raywenderlich.com/5492/working-with-json-in-ios-5

Edit:从答案看,看来,NSDictionary *json是另一个NSDictionary。我假定,这是错误的NSArray或NSString。换言之,NSDictionary *json = [@“invoice”, NSDictionary]

Answer 1

The problem is this:

NSArray *latestInvoice = [json objectForKey:@"invoice"];

实际上,应当:

NSDictionary *latestInvoice = [json objectForKey:@"invoice"];

......因为你是一个独裁者,而不是一个阵列。

Answer 2

Wow, 本土的JSON parser, 甚至没有通知。

NSArray *latestInvoice = [json objectForKey:@"invoice"];

This is actually a NSDictionary, not a NSArray. Arrays wont have keys. You seem capable from here.

Answer 3

在这方面,我你们不得不这样做。

NSData* data = [NSData dataWithContentsOfURL: jsonURL];

NSDictionary *office = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];

NSDictionary *invoice = [office objectForKey:@"invoice"];

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