Single tap to zoom out. Single tap or drag to dismiss.

[brianeunilkim]

Fix. Hides image view before zoom-in transition and shows it after zoom-out transition. This prevents still image showing behind the zoom-in transition.

Update. Instead of single tap to dismiss while zoomed in, single tap will zoom back out. When zoomed out, single tap or draggin will dismiss. Facebook style.

[gonzalezreal]

Thanks for the fix on hiding the images. As for the behaviour changes, nothing against it, apart from a couple of comments I did on the code.

[brianeunilkim]

Scroll view vertical bounce setting moved to xib file. Removed unnecessary line. Thanks!

[gonzalezreal]

LGTM

[gonzalezreal]

Thanks for contributing.