How to select an item conditionally in a ForEach element?

Question

In SwiftUI I want to show the favourite items only and I'm trying to do this with an if statement within the ForEach-element. See the code:

    var body: some View {
    NavigationView {
        List {
            Toggle(isOn: $showFavoritesOnly) {
                Text("Favorites only")
            }

            ForEach(self.buildings, id: \.self) { building in
                if(!self.showFavoritesOnly || building.favourite) {
                    Text("Blah")
                }
            }
        }
    }
}

However I getting a 'Unable to infer complex closure return type; add explicit type to disambiguate' error.

How can I select an item conditionally in a ForEach element?

May be ForEach is asking for the else part as it can not return a nil View if condition does not match. Just a suggestion I am not sure! — iRiziya
– iRiziya, Commented Oct 14, 2019 at 15:18

Marc Enschede · Accepted Answer · 2019-10-13 09:52:45Z

2

Using a filter is a working solution

    var body: some View {
    NavigationView {
        List {
            Toggle(isOn: $showFavoritesOnly) {
                Text("Favorites only")
            }

            ForEach(self.buildings.filter({b in self.showFavoritesOnly || b.favourite}), id: \.self) { building in
                Text("Blah")
            }
        }
    }

Still, I wonder how could I have fixed it using an if-statement

answered Oct 13, 2019 at 9:52

Marc Enschede

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1 Comment

Marc T. Over a year ago

I remember that I have seen the “if” approach in an example from Apple. Of course filtering is much better or even better placing it in a View-Model.

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