Converting Array of Objects into Object of arrays

Question

I have a class with some arrays of different types and let's say they're all filled with the same amount.

public class CoreLocationMap {

var type: [String] = []
var location: [Int] = []
var groupName: [NSString] = []
var x: [Float] = []

init() {}

}

I want something like a JSON Object:

var jsonObject = ({type = myString; location = 123; groupName = anotherString; x = 0.123}, {type = myString; location = 123; groupName = anotherString; x = 0.123}, ...)

It's not necessarily to have a jsonObject, but i want to capsule my variables in logical groups, so

type
location
groupName
x

should make a struct/object/whateever^^. If I use later for example a certain location i want to reference to the other variables in this group. I'm also pleased about other solutions. If you need more details please tell me.

Thanks!

giorashc · Accepted Answer · 2015-02-24 09:31:54Z

2

as you suggested you can use a struct to encapsulate your data:

struct LocationData {
   var type: String
   var location: Int
   var groupName: String
   var x: Float
}

and declare an array in your class :

var locationsData = Array<LocationData>()

add a function for adding elements :

func addLocationData(type: String, location: Int, groupName: String, x:Float) {
   // Add additional safety/limitation checks
   locationsData.append(LocationData(type: type, location: location, groupName: groupName, x: x) // structs have an implicit init method
}

edited Feb 24, 2015 at 9:31

answered Feb 24, 2015 at 9:25

giorashc

13.7k3 gold badges38 silver badges76 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

S. Birklin Over a year ago

Okay, and how to fill the struct from my CoreLocationMap?

giorashc Over a year ago

Can you give me an example of a usage you desire ? (even in pseudo-code)

S. Birklin Over a year ago

My array has got 760 value for each of type, location, groupName and x. So the solution u mentioned should have 760 "groups" in locationsData.

giorashc Over a year ago

Where these values come from ? use the add function to populate the list with the desired groups.

user1548843 · Accepted Answer · 2015-02-24 09:53:30Z

you can create model calss lets say locationModel like

  calss locationModel{
     var type:String
     var location : Int
     var groupName : String
     var x: Float

  // you can create Init method to init() model properties 
  // you can create custom method to fill values of model calss

  /* you create custom method that accept array as argument create 
    this class (locationModel) type of object in function load data
    from array to modelobject add modelobject in array and return
    this array.*/
 }

now you can create this model class object where you want to use and fill them with model class methods.

like if you want to use this in CoreLocationMap create location model and init it in your class and fill value.

and add this model objects in newly created array if you want array of object. hope this help you.

sehaswaran · Accepted Answer · 2015-02-24 11:03:00Z

0

This library does the same thing for you JSONModel https://github.com/icanzilb/JSONModel

This library has the following method

    NSArray* jsonObjects = [YourModelClass arrayOfDictionariesFromModels: modelObjects];

this method returns the Array of Dictionaries from Array of Objects.

Now , you can use

NSJSONSerialization

answered Feb 24, 2015 at 11:03

sehaswaran

1511 silver badge8 bronze badges

Collectives™ on Stack Overflow

Converting Array of Objects into Object of arrays

3 Answers 3

4 Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

4 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related