How do I access an array from one viewcontroller in another viewcontroller - ios

Question

I am very new to the swift language and am trying to make an app that would do some basic calculations. The problem I am running into is that I want to use the values from an array that is declared in one viewcontroller in another viewcontroller to do calculations.
I declare the array in the first viewcontroller like this:
var array2 = [Double]()
And then I have no idea how to access this in the second view controller. I have tried looking at previous questions as well as online tutorials and have had no success.
Any help is greatly appreciated. Thank you in advance.

Answer 1

in VC2 create global var array2 = [Double]()
add following override func to body of VC1
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let DVC = segue.destinationViewController as! ViewController2 //replace ViewController2 with the name of your 2nd VC
DVC.array2 = array2
}
Overall, what you are doing is telling VC1 to copy VC1's array2 to VC2's array2, before the segue happens.
As your app becomes more complex, if your VC1 has more than 1 segue...meaning can go to multiple different VC's...you'll need to change your prepareForSegue so that it takes into account for this.
One way to do this is to change it to
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "SegueIdentifier you give to that particular segue in identityInspector" {
let DVC = segue.destinationViewController as! ViewController2 //replace ViewController2 with the name of your 2nd VC
DVC.array2 = array2
}
}