Passing data from the FirstViewController to the LastViewController

Question

I have four viewControllers in my current design and I am designing an app to sell a product.

FirstViewController gets the product image and when user

Answer 1

One way of doing this would be that you create a mutable dictionary (or a custom object with variables) in the first view controller. Then you would pass a weak reference to second/third/fourth view controllers of the mutable dictionary/object from first view controller. Each view controller would be able to set data to the dictionary/object and the last one would be able to process the information.

Another way would be to create a simple singleton class with variables that you want to store. The first view controller would reset the singleton variables. Then let each view controller access the singleton and store their values there, last view controller would process values from singleton.

It depends how many data you are collecting and what you personally prefer.