Swift static lazy.swift

/// Example type
public struct Foo {
    // Fields...
}



/// Wraps `Foo` so it can be used for that static variable later
private struct FooWrapper {
    static var shared = FooWrapper()
    
    lazy var foo: Foo! = {
        let foo = Foo()
        // Setup...
        return foo
    }()
}



// MARK: - Usage

/// A global, "static", lazy-initialized, resettable varaible
public var foo: Foo! {
    get {
        return FooWrapper.shared.foo
    }
    set {
        FooWrapper.shared.foo = newValue
    }
}

// or:

/// A scoped, static, lazy-initialized, resettable varaible
struct Bar {
    static var foo: Foo! {
        get {
            return FooWrapper.shared.foo
        }
        set {
            FooWrapper.shared.foo = newValue
        }
    }
}