ios - Keeping a view controller in it's state after you leave and come back to it- Swift -

right have 2 view controllers, , when gather data second view controller display in label in first view controller (a random integer):

var firstinteger = //random integer  override func viewdidload() {     super.viewdidload()      totalamount.text = string(firstinteger) 

this works fine, when user goes second view controller , gets new random integer, want add integer first 1 gathered, many times user goes second view controller , "gets" new integer- decided this:

var firstinteger = //random integer var newinteger = 0      override func viewdidload() {     super.viewdidload()     totalamount.text = string(firstinteger + newinteger)     newinteger = firstinteger + newinteger 

but know doesn't work, since everytime user go first view controller, reset newinteger's value 0- know how fix this?

you need declare newinteger static

class myclass  {     static var newinteger = 0 } 

this create 1 variable newinteger @ class level (or type level swift calls it) should able access in code

myclass.newinteger = firstinteger + myclass.newinteger 

read through more details on variable types , life cycles in swift

type properties