iOS Parse Inner Json

Question

嗨我有以下需要解析的json，但是，我正在努力解析内部数组。我目前只打印每个内部数组，但我想打印说每个标题并将标题添加到数组。谢谢你的帮助！

JSON

{"nodes":[{
    "node":{
        "nid":"1420857",
        "title":"Title 1",
        "votes":"182",
        "popular":"True",
        "teaser":"Teaser 1"
    }},
    {"node":{
        "nid":"1186152",
        "title":"Title 2",
        "votes":"140",
        "popular":"True",
        "teaser":"Teaser 2"
    }},
    {"node":{
        "nid":"299856",
        "title":"Title 3",
        "votes":"136",
        "popular":"True",
        "teaser":"Teaser 3"
    }}
]}

Json Parser

    NSError *error = nil;
    NSData *jsonData = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://www.somefilename.json"]];
    if (jsonData) {
        id jsonObjects = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:&error];
        if (error) {
            NSLog(@"error is %@", [error localizedDescription]);
            return;
        }
        NSArray *keys = [jsonObjects allKeys];
        for (NSString *key in keys) {
            NSLog(@"%@", [jsonObjects objectForKey:key]);
        }
    } else {
        // Handle Error
    }

Answer 1

只是强调它：

NSArray *nodes = (NSArray*)[jsonObjects objectForKey:@"nodes"];
for (NSDictionary *node in nodes){
     // do stuff...
}

返回id（如-[objectForKey:]和-[objectAtIndex:]）的方法可以返回任何objective-c对象。您需要提前知道要对其进行类型转换以对其执行适当的操作。 JSON转换为NSObject等价物：

• object - ＆gt; NSDictionary
• array - ＆gt; NSArray
• string - ＆gt; NSString
• number - ＆gt; NSNumber
• boolean - ＆gt; NSNumber
• float - ＆gt; NSNumber
• null - ＆gt; NSNull

要区分各种NSNumbers，您必须调用相应的类型方法：-[intValue]，-[boolValue]，-[floatValue]。查看NSNumber docs了解详情。

Answer 2

您可以使用我的方法进行json解析，

解析方法：

    -(void)jsonDeserialize:(NSString *)key fromDict:(id)content completionHandler:(void (^) (id parsedData, NSDictionary *fromDict))completionHandler{
    if (key==nil && content ==nil) {
        completionHandler(nil,nil);
    }
    if ([content isKindOfClass:[NSArray class]]) {
        for (NSDictionary *obj in content) {
          [self jsonDeserialize:key fromDict:obj completionHandler:completionHandler];
        }
    }
    if ([content isKindOfClass:[NSDictionary class]]) {
        id result = [content objectForKey:key];
        if ([result isKindOfClass:[NSNull class]] || result == nil) {
            NSDictionary *temp = (NSDictionary *)content;
            NSArray *keys = [temp allKeys];
            for (NSString *ikey in keys) {
             [self jsonDeserialize:key fromDict:[content objectForKey:ikey] completionHandler:completionHandler];
            }
        }else{
            completionHandler(result,content);
        }
    }
}

方法调用：

 NSData *content = [NSData dataWithContentsOfFile:[[NSBundle mainBundle]pathForResource:@"Sample" ofType:@"json"]];
    NSError *error;

  

//获取序列化的json数据......

   id dictionary = [NSJSONSerialization JSONObjectWithData:content options:NSJSONReadingMutableContainers error:&error];

  

//获取名为 GetInfo

的密钥的数据

     [self jsonDeserialize:@"GetInfo" fromDict:dictionary completionHandler:^(id parsedData, NSDictionary *fromDict) {
            NSLog(@"%@ - %@",parsedData,fromDict);
        }];