Swift: Variable used before being initialized

Question

I get the following compiling error: "Variable 'self.entryData' used before being initialized" How can I fix it and initialise the @state var entryData correctly in my init method?

struct EditEntryView: View {
    @Environment(\.managedObjectContext) private var viewContext
    @State var entryData: EditEntryData
    @ObservedObject var moneyEntry: MoneyEntry
    
    init(entry: MoneyEntry) {
        moneyEntry = entry
        let iOwe = entry.value < 0 ? true : false
        let value = abs(entry.value)
        
        
        entryData = EditEntryData(info: entry.infos, value: String(value), date: entry.date, iOwe: iOwe)
    }
}

struct EditEntryData {
    var info: String = ""
    var value: String = ""
    var date: Date = Date()
    var iOwe: Bool = false
}

EditEntryData is a simle struct. I added the structs definition to the question — hfs23, Jul 14 '21 at 12:57
You cannot initialise a `@State` variable in the initialiser. State is private to the view and needs to be initialised inline in the declaration, outside the initialiser: `@State var entryData = EditEntryData(...)`. If you cannot do this, it's simply not "state". Put this value into a redesigned `@ObservedObject` class. — CouchDeveloper, Jul 14 '21 at 14:48

score 1 · Accepted Answer · answered Jul 14 '21 at 12:59

1

You need to initialise state itself, like

    _entryData = State(initialValue: 
         EditEntryData(info: entry.infos, 
         value: String(value), date: entry.date, iOwe: iOwe))

answered Jul 14 '21 at 12:59

Asperi

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A View is a function! This would create a new state variable whenever the view will be initialised, i.e. whenever it needs to be rendered. That would defeat the purpose of `@State` which is meant to manage state which is kept alive through several lifecycles, ie. calling the render function. – CouchDeveloper Jul 14 '21 at 14:37

Swift: Variable used before being initialized

1 Answers1