Allow restricting HUD to a parent view.

[patridge]

• Allow a constructor to be called with a parent view that will contain the mask overlay (allowing HUD within a tab, for instance).
• Figure out a good way to interact the parent view system with the static Show methods.
• Test that combining Show calls with a parent and without a parent doesn't blow up the world.

(Note: I wasn't sure where to send the PR, but this looked like the in-progress branch so I went for it. I can always cherry-pick it to a master-derived branch, though.)

[streinhard]

👍 This would allow usage in Extensions

[Cheesebaron]

Closing this PR as it is super stale.

@patridge can you maybe outline the idea behind this PR? As far as I understand you want to allow it to show in a specific ViewController, rather than trying to find the current Window and adding it there?

[patridge]

Sorry, I definitely don't remember the specifics, and I don't even work where I fist had to make this hack work. I think I was having issues with multiple HUDs and/or across multiple ViewControllers. Or maybe it was when ViewControllers weren't full screen, like the extension example. I really have nothing left in my brain about this, so closing is fine.

[patridge]

Actually, seeing this line helped.
https://github.com/redth-org/BTProgressHUD/pull/36/files#diff-94ddb517436bae64cf7f87eb485d3c15R859

// Make sure we account for parent size changing (e.g., TabBar/StatusBar auto-adjustments).

Maybe it was something as simple as limiting the HUD to the tab within a tab controller so that other tabs could still be used.