如何获得与目标c中的json相同的字典顺序

Question

i am parsing json and what i get set of dictionary but after parsing it will automatically change it order. i just need same order as same i am getting from json parsing.

NOTE: i want to make one functionality which depends on dictionary order, i don't want to make it manually. so it will not need to make it every-time to do.it will help to change dynamically in future

Example: From Json:

Section:
{
  category:{},
  location:{},
  vehicle_type:{},
  mode_type:{}
}

after convert into NSDicationary:

Section:
{
  vehicle_type:{}
  category:{},
  location:{},
  mode_type:{}

}

Thanks

Answer 1

Order of key:value doesn't matter for JSON, as you can directly access value with the help of key string. An dictionary does not support indexing of elements, so you can't.

Answer 2

Dictionaries are not ordered collections. On other hand, arrays are.

Note, if you don't have access over the json format, you got no guarantees about the order of elements, if you don't have hardcoded logic in your app.

Having said that, let's take a deeper look into your case. It happens that you have one main object in your json that is Section . What is more, you have 4 ordered properties of this object that are of specific kind of their own: 0: category; 1: location; 2: vehicle_type; 3: mode_type 0: category; 1: location; 2: vehicle_type; 3: mode_type 0: category; 1: location; 2: vehicle_type; 3: mode_type . So here comes the good part: just change your json to look something like this:

Section:
[
  {
     title: "category",
     value: {}
  },
  {
     title: "location",
     value: {}
  },
  {
     title: "vehicle_type",
     value: {}
  },
  {
     title: "mode_type",
     value: {}
  }
]

Having this json, you just go through the Section ordered elements, check the title of the element, and create the corresponding Object. This way you can achieve what you are after.