How to send an array of struct between two view controllers? - swift

Question

Im trying to send an array "ranking" of Struct between two VC after tapping the "rankingButton". I don't know what to code in the second vc to get and manipulate the array.
First VC:
struct TopPoint{
let user: String
let points: Int
var position: Int
}
var ranking: [TopPoint] = []
override func viewDidLoad() {
super.viewDidLoad()
let user1 = TopPoint(user: "fran", points: 1324, position: 1)
ranking.append(user1)
}
#IBAction func rankingButton(_ sender: Any) {
let vc = TopUserTableViewController(nibName: "TopUserTableViewController", bundle: nil)
vc.ranking = ranking
navigationController?.pushViewController(vc, animated: true)
}
Second VC:
class TopUserTableViewController: UITableViewController {
var ranking = [TopPoint]()
override func viewDidLoad() {
super.viewDidLoad()
}
//what to code to get the array?
}

Answer 1

Once your secondVC pushed, you can directly access the array in the secondVC. Because you set its ranking property equal to ranking in the firstVC For example consider having a method to iterate through array elements and print user of each struct element inside your array. You can do it by:
class TopUserTableViewController: UITableViewController {
var ranking: [TopPoint]!
override func viewDidLoad() {
super.viewDidLoad()
iterateElements()
}
func iterateElements() {
ranking.forEach { (element) in
print(element.user)
}
}
}
You could also access directly inside your viewDidLoad, I added iterateElements method as reference, access directly in viewDidLoad as:
override func viewDidLoad() {
super.viewDidLoad()
ranking.forEach { (element) in
print(element.user)
}
}

Answer 2

viewDidLoad() is too early in the lifecycle. Just move your code:
func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
ranking.forEach { (element) in print(element.user) } }
}