gistfile1.txt

class Bar {
    let id : Int
    init(id: Int) { self.id = id }
}

class Foo {
    var bar : Bar
    init(bar: Bar) { self.bar = bar}
    
    func printBar() {
        print(bar.id)
    }
}

let b = Bar(id: 5)

let f = Foo(bar: b)

let printMethod = f.printBar // if bar has been captured, the method will now always print b.id (5)

let b1 = Bar(id: 7)

f.bar = b1

printMethod() // prints b1.id (7), thus no capturing