Why is main window of type double optional?

Question

When accessing UIapplication\'s main window it is returned as a UIWindow??

let view = UIApplication.sharedApplication().delegate?.w         


        

Answer 1

Oh the double optional! Sometimes you can use a double-bang (two exclamation marks) but you cannot cast that way with optional binding. So... my remix of all the other code gets you a UIWindow object called window of the non-optional kind:

guard let w = UIApplication.shared.delegate?.window, let window = w else { return }

But let's not waste time and just use

let window = UIApplication.shared.delegate!.window!!

and be done.