SingletonInSwift

This is an attempt to make an Interface-Builder-friendly Singleton in Swift as mentioned here.

It all works, but somehow the vc1 variable in the test becomes nil after it's set (and the setter is not called again). Baffling!

Console Log After Pressing:

1. Print Status
2. VC2
3. Print Status

Hello, I am <Universe: 0x7fbcb2c35050> and vc1 is Optional(<SingletonInSwift.ViewController: 0x7fbcb2c071c0>) and vc2 is nil
Hello, I am <Universe: 0x7fbcb2c35050> and vc1 is nil and vc2 is Optional(<SingletonInSwift.SecondViewController: 0x7fbcb4a166c0>)

Any help or advice would be appreciated.