Closure | Error when referring static variable

Question

Created Jun ’24

Replies 2

Boosts 0

Participants 3

 struct Preview: View {
    private static let NAME = "Test"
 
    @Query(filter: #Predicate<Item> { $0.name == Preview.NAME})
    private var items: [Item]
 
    var body: some View {
        MyView(name: Preview.NAME, items: items)
    }
}

Compile error occurs: key path cannot refer to static member 'NAME' How can a (static) constant be referred in member closure?

Answered by Frameworks Engineer in 791142022

Unfortunately #Predicate does not support referencing static properties. Can you redesign your view such that this value is not in a static property?

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Answer 1

Claude31 OP

Jun ’24

You can refer to a static variable. As shown in the small code below:

 struct Preview: View {
    private static let NAME = "Test"
    var array: [String] = ["someTest", "Hello", "HelloTest"]
    var filtered: [String] {
        array.filter { $0.contains(Preview.NAME) }
    }
 
    var body: some View {
        ForEach(filtered, id: \.self) { s in
            Text(s)
        }
    }
}

So the problem is the use in the Query. May be you could try to include in a computed var ?

0

Answer 2

Frameworks Engineer OP

Apple

Jun ’24

Accepted Answer

Recommended

Unfortunately #Predicate does not support referencing static properties. Can you redesign your view such that this value is not in a static property?

1

	struct Preview: View {
	private static let NAME = "Test"

	@Query(filter: #Predicate<Item> { $0.name == Preview.NAME})
	private var items: [Item]

	var body: some View {
	MyView(name: Preview.NAME, items: items)
	}
	}

	struct Preview: View {
	private static let NAME = "Test"
	var array: [String] = ["someTest", "Hello", "HelloTest"]
	var filtered: [String] {
	array.filter { $0.contains(Preview.NAME) }
	}

	var body: some View {
	ForEach(filtered, id: \.self) { s in
	Text(s)
	}
	}
	}