I’m studying the Collection protocol and decided to implement my own collection, but I didn’t stop there and wanted to implement the index(after:) method so that it works the other way around

struct SimpleCollection: Collection {
    var numbers = [1, 2, 3, 4, 5]

    var startIndex: Int { numbers.startIndex }
    var endIndex: Int { numbers.endIndex }

    subscript(index: Int) -> Int {
        return numbers[index]
    }

    func index(after i: Int) -> Int {
        return numbers.index(after: i)
    }
}

Here is my structure and I want to implement the Index(after:) method so that it is output in the opposite direction

let test = SimpleCollection();
for items in test{
    print(items)
}

What is being displayed now

1
2
3
4
5

What i want

5
4
3
2
1