解析JSON读取各种字典

Posted 2023-02-24

【中文标题】解析JSON读取各种字典

【英文标题】：Parsing JSON read the various dictionaries

【发布时间】：2014-08-10 21:12:09

【问题描述】：

我是 json 新手，遇到了一些困难，我正在尝试解析以下 json。

但我无法阅读各种字典“项目”。

["project": 
"id": 123,
"name": "Produce RestKit Sample Code",
"description": "We need more sample code!",
"user": 
    "id": 1,
    "name": "Blake Watters",
    "email": "[e-mail]"
,
"tasks": [
    "id": 1, "name": "Identify samples to write", "assigned_user_id": 1,
    "id": 2, "name": "Write the code", "assigned_user_id": 1,
    "id": 3, "name": "Push to Github", "assigned_user_id": 1,
    "id": 4, "name": "Update the mailing list", "assigned_user_id": 1
],
"project": 
"id": 456,
"name": "Document Object Mapper",
"description": "The object mapper could really use some docs!",
"user": 
    "id": 2,
    "name": "Jeremy Ellison",
    "email": "[e-mail]"
,
"tasks": [
    "id": 5, "name": "Mark up methods with Doxygen markup", "assigned_user_id": 2,
    "id": 6, "name": "Generate docs and review formatting", "assigned_user_id": 2,
    "id": 7, "name": "Review docs for accuracy and completeness", "assigned_user_id": 1,
    "id": 8, "name": "Publish to Github", "assigned_user_id": 2
]]

我正在使用 AFNETWorking，这是我的代码：

AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
operation.responseSerializer = [AFJSONResponseSerializer serializer];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) 
for (NSDictionary *json in [responseObject objectForKey:@"project"])
        simProjects *proj = [[simProjects alloc] init];
        proj.description = [json objectForKey: @"description"];

【问题讨论】：

你收到的 JSON 绝对是一个数组。它是一个 NSDictionary 的数组，每个 NSDictionary 都有一个键“项目”。

【参考方案1】：

如前所述，您确实有一系列字典。你想要：

[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) 
    NSArray *projects = responseObject;
    for (NSDictionary *data in projects) 
        NSDictionary *project = data[@"project"];
        simProjects *proj = [[simProjects alloc] init];
        proj.description = project[@"description"];