How to create a proper singleton for Dictionary in Swift 2

Question

I have the following code

class Test: UIViewController {
  var imagesOfChef = [Int : chefImages]()
    struct chefImages {
          var objidChef: String!
          var imageChef: UIImage!
      }

}

I fill up this dictionary as soon as the user opens the application. But i want it to be available also in other Views (swift files)

Lets say in this class

class Test2: UIViewController{

}

How can i create a singleton for this Dictionary so it can be available to other views?

Thanks for your time!

Example here with an array, easy to adapt for dictionary: http://stackoverflow.com/a/35440014/2227743 You can also have a look at http://stackoverflow.com/a/36012158/2227743. — Eric Aya, Aug 13 '16 at 11:01
You can try like this http://stackoverflow.com/a/38825263/6433023 — Nirav D, Aug 13 '16 at 11:03

Marco Santarossa · Accepted Answer · 2016-08-13T13:48:45.973

3

You can use a static property:

static var imagesOfChef = [Int : chefImages]()

and then you use:

Test.imagesOfChef

But I suggest avoiding the static approaches as much as possible, you can use the prepare segue or assign the property from outside if possible if Test has Test2.

edited Aug 13 '16 at 13:48

answered Aug 13 '16 at 12:06

Marco Santarossa

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score 2 · Answer 2 · answered Aug 13 '16 at 12:12

There are plenty of examples on StackOverlow about how to create a Singleton.

Anyway, your code should be like this

struct Chef {
    let id: String
    let image: UIImage
}

final class Singleton {
    static let sharedInstance = Singleton()
    private init() { }        
    var dict = [Int: Chef]()
}

Now in any source of your app you can use it

Singleton.sharedInstance.dict[1] = Chef(id: "1", image: UIImage())

How to create a proper singleton for Dictionary in Swift 2

2 Answers2