IOS: Pass Array to another View

Question

i recently started ios development and am kind of stuck here. I created an tabbed application. Inside the FirstViewController i hold a list of objects, containing coordinates. On the second tab I have a MapView.

I want to show a pin on the map for every coordinate in the list in ViewController 1 but I don't know how

I can access the Array in the other viewController
I can get informed when this list grows so the additional pins can be created

You should think about "modeling" your point data into some sort of structure that is accessible to both view controllers that need to know about it. This is a very common question. — Aaron, Mar 11 '15 at 16:46

score 0 · Answer 1 · answered Mar 11 '15 at 16:44

You should read about MVC or MVVM. In this design patterns you should use model which store Coordinates. And Controller or ViewModel must have link to this model.

ViewControllerA -> owns CoordinateModel ViewControllerB -> owns the same CoordinateModel

Also, Coordinate model should inform both controllers about changes.

score 0 · Answer 2 · answered Mar 11 '15 at 16:51

If the map view controller needs to know about what's happening in the first controller, but not the other way around, I would suggest using delegation. Make the map view controller the delegate of the first controller, and have that first controller send a message to its delegate any time its array of objects changes.

IOS: Pass Array to another View

2 Answers2