Setting the value of a Picker to index of object

Question

I have a view called EditEventView(), which is displayed as a sheet, and has two objects passed into it; Team and Match Event. Inside the match event object, I store an attribute of type Player, these players can also be found using team.players.

Inside this new sheet view, I have some PickerViews which should show all the players of a Team object, the user can then select one and it's assigned to the Match Event. When I loaded into this view I wanted the @State variable to be set to the index of these players, rather than 0, which they are set at currently. However I believe it is impossible to change these states' values inside the view, and I don't have enough knowledge of init functions to look at this.

This is an abbreviated version of EditEventView():

struct EditEventView: View { @ObservedObject var team: Team @State var event: MatchEvent @State var playerSelect = 0 var body: some View{ NavigationView{ Form{ Picker(selection: $playerSelect, label: Text("Player Off")) { ForEach(0..<team.players.count) { Text("\(team.players[$0].shirtNumber) - \(team.players[$0].playerName)") } .navigationBarTitle("Select Player Off") }

This view is shown using:

Button(action: {self.event = event}) { MainEventBox(event: event) } .sheet(item: self.$event){ event in EditEventView(team: event.team, event: event) }

Match Event is a struct, like this:

struct MatchEvent: Identifiable{ var id = UUID() var team: Team var player: Player var eventType: eventType }

Each Team is structured like this:

class Team: ObservableObject{ @Published var players: [Player] = [Player(playerName: "", shirtNumber: 1, active: true), Player(playerName: "", shirtNumber: 2, active: true), Player(playerName: "", shirtNumber: 3, active: true)....] func findPlayer(player: Player) -> Int?{ var i: Int = 0 for x in self.players{ if x.id == player.id{ return i } i += 1 } return nil } }

I believe that I would have to initialize the view and set the value of playerSelect to the result of team.findPlayer(player: event.player). However, I'm not sure and may be completely wrong! Any help would be appreciated!

"I have a view called EditEventView(), which is called a sheet" Que!? You mean, you have a view called EditEventView(), which calls a sheet? If so, where is the sheet? — El Tomato
– El Tomato, Commented Dec 18, 2020 at 0:19

Cuneyt · Accepted Answer · 2020-12-18 03:13:12Z

Here is how you can initialize the state var:

 @ObservedObject private var team: Team @State private var event: MatchEvent @State private var playerSelect init(team: Team, event: MatchEvent) { self.team = team self._event = State(initialValue: event) let playerSelect = team.findPlayer(player: event.player) self._playerSelect = State(initialValue: playerSelect) }

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