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UIWindow is declared with 2 question marks --> UIWindow?? (at least autocompletion says so) What does this mean? I'm pretty sure it's not nil coalescing operator.

Maybe that is a poor choice of words... The window property of appDelegate is of type UIWindow??.

potato
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    is this a Swift question? Update your tags. – rmaddy Apr 20 '15 at 19:14
  • I just looked in one of my client's apps and the app delegate's property is defined a optional UIWindow (`UIWindow?`) just like you'd expect. I'm not seeing a double question mark as you mention. – Duncan C Apr 20 '15 at 19:24
  • This might help: http://stackoverflow.com/a/25176521/1187415. – Martin R Apr 20 '15 at 19:25

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