Question

我有一个使用RestKit和CoreData的iOS应用。由于请求正文由NSDictionary组成，因此我遇到了发出POST请求的路障。我遇到的问题是请求正文需要有重复的密钥。 NSDictionary需要使用唯一键，因此我不确定如何使其正常工作。

以下是服务器对请求正文的期望。

<node>
    <personId>2</personId>
    <status>2</status>
    <title>Dinosaur unearthed somewhere out there. </title>

    <point>
        <city>Somewhere</city>
        <copy><![CDATA[An amazing discovery was unearthed as a local farmer was plowing his field]]></copy>
        <state>Outthere</state>
        <sequence>1</sequence>
    </point>

    <point>
        <city>Somwhere</city>
        <copy><![CDATA[Archeologists from around the world are amazed at the pristine condition of the remains. Also of note is that the farmer was only using a single blade plow on his John Deere tractor when it was unearthed. ]]></copy>
        <sequence>2</sequence>
        <state>Outthere</state>
    </point>

    <point>
        ......
    </point>
</node>

这是我试图让它发挥作用的简化版本....

params = [[NSMutableDictionary alloc] init];
nodes = [[NSMutableDictionary alloc] init];
nodeParams = [[NSMutableDictionary alloc] init];

NSString *personId = @"2";
NSString *status = @"2";
NSString *title = @"Dinosaur unearthed somewhere out there.";
NSString *city = @"Somewhere";
NSString *state = @"OutThere";
NSString *copyField = @"Testing this out to see if it works";

//Here I set up the point layer of the request body
//In my code this three line section is in a loop. Obviously this does not work because it just overwrites the objectForKey each time through the loop.
[params setObject:copyField forKey:@"copy"];
[params setObject:city forKey:@"city"];
[params setObject:state forKey:@"state"];

//Here I Set up the Node Layer of the request body
[nodeParams setObject:params forKey:@"point"];
[nodeParams setObject:personId forKey:@"personId"];
[nodeParams setObject:status forKey:@"status"];
[nodeParams setObject:title forKey:@"title"];
[nodes setObject:nodeParams forKey:@"node"];

NSLog(@"The Dictionary is %@",nodes);

在运行时，日志显示正文已正确格式化，除了它们只有一个点层，并且它填充了循环中最后一遍的数据。有没有人知道如何解决这个问题？

作为注释，我认为postObject方法需要NSDictionary，因为它将字典传递给JSON序列化工具。我怀疑序列化工具是否希望传入字典。如果有人知道，如果我错了，请更正我。

Answer 1

好的，我终于弄明白了。直到我将上面的XML转换为JSON，我才意识到它是如何完成的。关键是要识别如何在'NSJSONSerialization'类中格式化Array和NSDictionary。

以下是服务器如何期待JSON的示例。

{ "status":"2",
  "title":"test #5",
  "personId":"1",
  "point":[
           { "copy":"<p class=\"pt\" data-seq=\"1\">This is paragraph #1<\/p>",
             "state":"OutThere",
             "city":"Somewhere",
             "sequence":"1"
           },

           { "copy":"<p class=\"pt\" data-seq=\"2\">This is paragraph #2<\/p>",
             "state":"OutThere",
             "city":"Somewhere",
             "sequence":"2"
           }
      ]
}

这里要注意的关键是"point"字段是和字典数组。 [表示数组。一旦我最终了解到，我意识到每次通过循环我都可以重新初始化我的字典，添加新对象，然后将当前字典添加到数组中，如下所示。

while (![theScanner isAtEnd]) {
    count = count +1;

    //Initialize the dictionary
    points = [[NSMutableDictionary alloc] init];

    NSString *htmlTag = [NSString stringWithFormat:@"<p class=\"pt\" data-seq=\"%d\">",count];
    [theScanner scanUpToCharactersFromSet:[NSCharacterSet newlineCharacterSet] intoString:&temp];

    NSString *preTagText = [htmlTag stringByAppendingString:temp];
    NSString *postTagText = [preTagText stringByAppendingString:@"</p>"];
    NSString *sequence = [NSString stringWithFormat:@"%d",count];
    [points setObject:postTagText forKey:@"copy"];
    [points setObject:sequence forKey:@"sequence"];
    [points setObject:city forKey:@"city"];
    [points setObject:state forKey:@"state"];
    [pointArray addObject:points];
     points = nil;

}
[params setObject:titleText forKey:@"title"];
[params setObject:personIdNumber forKey:@"personId"];
[params setObject:status forKey:@"status"];
[params setObject:pointArray forKey:@"point"];

循环结束后，我只需将pointArray添加到字典中作为具有键point的对象（谢谢Wain）。我将title，status和personId对象添加到同一个字典中，并将其用作Restkit POST请求所需的NSDictionary。

如何设置要在Restkit POST请求中使用的NSDictionary

1 个答案: