ios - IOS JSON解析

Question

我知道如何使用所有密钥对值解析 JSON 数据。检查下面的 JSON

{“a”：[“a1”，“a2”，“a3”]，“b”：[“b1”，“b2”，“b3”]}

在此键值 a 和 b 不是静态键值。它们是动态键值。我如何解析这个？

Answer 1

如果你知道它们是数组：

NSDictionary *parsedData = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&error];

for (NSString *key in [parsedData allKeys])
{
  // you have now a key to an array
}

Answer 2

要将 JSON 转换为 NSDictionary：

NSError *error= nil; 
NSDictionary *parsedDictionary = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];

parsedDictionary 将是

parsedDictionary = {
a = [a1,a2,a3],
b = [b1,b2,b3]
};

获取字典中的所有键

NSArray *allKeys = [parsedDictionary allKeys];

获取字典中的 a 和 b 数组

for (NSString *key in allKeys)
{

NSArray *a = parsedDictionary[key];

}

Answer 3

   //Get json data in Dictionary
json = [NSJSONSerialization JSONObjectWithData:data options: NSJSONReadingMutableContainers error: &error];

NSLog(@"%@",json);

NSArray * responseArr = json[@"Deviceinfo"];   // Here you need pass your key

for(NSDictionary * dict in responseArr)
{

    [delegate.firstArray addObject:[dict valueForKey:@"a"]];
}

试试这个代码...

Answer 4

你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的键的数据

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