Question

我有一个类似于json的响应：

{
    "status": "success",
    "status_code": 200,
    "active": {
        "owned": [
            {
                "id": "1",
                "name": "Chd Home",
                "type": "home",
            },
            ...
        ],
        "shared": [
            {
                "id": "3",
                "name": "Ram's home",
                "type": "home",
            },
            ...
        ]
    },
    "deactivated": {
        "owned": [
            {
                "id": "2",
                "name": "Home",
                "type": "home",
            }
        ]
}

我跟随Ray Wanderlich的教程：http://www.raywenderlich.com/5492/working-with-json-in-ios-5，这部分代码专门：

- (void)fetchedData:(NSData *)responseData {
NSError* error;
NSDictionary* json = [NSJSONSerialization
                      JSONObjectWithData:responseData //1
                      options:kNilOptions
                      error:&error];

NSArray* latest = [json objectForKey:@"active"]; //2    
NSLog(@"items: %@", latest); //3
}

现在，当我想要一个关键对象＆＃34; active＆＃34;时，我使用了这个NSArray* latest = [json objectForKey:@"active"];并获取了最新数组中的数据，但是当我只想要找到<时的对象时/ strong>，我使用此NSArray* latest = [json objectForKey:@"found"];但最新内容为（null）

我有什么东西在这里失踪吗？如何访问json数组的子对象？就像在这种情况下拥有和共享一样。继续前进我想为有效＆gt;创建不同的对象拥有，有效＆gt;已共享，已停用＆gt;拥有，等等。

感谢阅读。

Answer 1

你需要的是深入了解json数据字典的层次结构以获取数据。

尝试使用此[[json objectForKey:@"active"] objectForKey:@"owned"]获取活动和拥有的数据。就像这样，你可以获得停用

Answer 2

拳头，active是字典，不是数组。你应该检查错误。

要active和owned执行此操作

- (void)fetchedData:(NSData *)responseData {
    NSError* error = nil;
    NSDictionary *json = [NSJSONSerialization
                  JSONObjectWithData:responseData
                  options:kNilOptions
                  error:&error];
    if (error) {
        NSLog(@"Error: %@", error);
        return;
    }

    NSDictionary *active = json[@"active"];    
    NSLog(@"active: %@", active);
    NSArray *owned = latest[@"owned"];
    NSLog(@"owned: %@", owned);
}

Answer 3

 "active": {
        "owned": [
            {
                "id": "1",
                "name": "Chd Home",
                "type": "home",
            },
            ...
        ],
        "shared": [
            {
                "id": "3",
                "name": "Ram's home",
                "type": "home",
            },
            ...
        ]
    },

活动元素是dictionary，因为{已启动，您可以参考http://www.json.org/有关每个符号代表的信息

现在活动元素是一个字典，所以首先你需要获取active键的字典对象并遍历它以获取该字典的内部对象

NSDictionary* latest = [json objectForKey:@"active"]; // this will give you the dictionary

，最新的元素将是

"owned": [
    {
        "id": "1",
        "name": "Chd Home",
        "type": "home",
    },
    ...
],
"shared": [
    {
        "id": "3",
        "name": "Ram's home",
        "type": "home",
    },
    ...
]

现在获取密钥owned的数组作为拥有的[开头，这就是你想要的那样

NSArray *owned = latest[@"owned"];

这会给你

    {
        "id": "1",
        "name": "Chd Home",
        "type": "home",
    },
    ...

这部分

iOS 7：从json响应中选择特定对象

3 个答案: