CODEWITHSUNDEEP
swiftui
Matias Masso
Matias Masso

Reputation: 1980

SwiftUI Optional binding argument on View init

I have a view which sometimes is used to browse data and sometimes to select data.

When used to browse, it is presented by a NavigationLink.

When used to select data, it is presented as a modal sheet and closed by setting binding boolean isPresented to false, so I can make use of sheet function onDismiss.

On browse mode, however, I need a way to skip initializing isPresented binding boolean. The right way would be an optional argument on view init() but all what I try throws an error.

This is the way I call it for browsing data:

NavigationLink(destination:BrowseOrSelectView(selMode:SelModes.browse)) {
Text("Browse")
}

This is the way I call it to select data:

.Sheet(isPresented: self.$isPresented, onDismiss:{...}) {
    BrowseOrSelectView(selMode: SelModes.selection, isPresented: self.$isPresented)
}

This is the view:

struct BrowseOrSelectView: View {
    @State var selMode:SelModes
    @Binding var isPresented:Bool

    public init(selMode: SelModes, isPresented:(Binding<Bool>)? = true) {
        UITableView.appearance().separatorStyle = .none
        _selMode = State(initialValue: selMode)
    }
...
}

The error thrown is:

Cannot convert value of type 'Bool' to expected argument type Binding Bool

Upvotes: 3

Views: 745

Answers (1)

Asperi
Asperi

Reputation: 257693

Use .constant binding, like

public init(selMode: String, isPresented:(Binding<Bool>) = .constant(true)) {
    UITableView.appearance().separatorStyle = .none
    _selMode = State(initialValue: selMode)
    _isPresented = isPresented
}

Upvotes: 4

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