Cannot use instance member 'name' within property initializer; property initializers run before 'self' is available

Question

Jad-T OP

Created Apr ’21

Replies 2

Boosts 0

Views 4.1k

Participants 2

Hello
Why does it give me an error when I pass 'name' at line 3?

Code Block struct OtherView: View {
    @State private var name: String = ""
    @ObservedObject var use = Use(name: name)
    var body: some View{
        VStack{
            
        }
    }
}
class Use: ObservableObject {
    @Published var name: String
    init(name: String) {
        self.name = name
    }
}

Thank you

Answered by Claude31 in 670207022

In fact the message is pretty explicit.

You try to use self (by using its name property) before self is fully initialised (use is not yet defined).
That's a classical catch 22 situation in init.

Unfortunately, you cannot declare use as lazy because it is an observedValue.

But this should work

Code Block struct OtherView: View {
    @State private var name: String = ""
    @ObservedObject var use : Use = Use(name: "")
    init() {
        use = Use(name: name)
    }
    var body: some View{
        VStack{
            
        }
    }
}

Boost

Answer 1

Claude31 OP

Apr ’21

Why not simply write

Code Block     @State private var name: String = ""
    @ObservedObject var use = Use(name: "")

Have a look here for some details:
https://developer.apple.com/forums/thread/128366

0

Answer 2

Claude31 OP

Apr ’21

Accepted Answer

In fact the message is pretty explicit.

You try to use self (by using its name property) before self is fully initialised (use is not yet defined).
That's a classical catch 22 situation in init.

Unfortunately, you cannot declare use as lazy because it is an observedValue.

But this should work

Code Block struct OtherView: View {
    @State private var name: String = ""
    @ObservedObject var use : Use = Use(name: "")
    init() {
        use = Use(name: name)
    }
    var body: some View{
        VStack{
            
        }
    }
}

0