Photo Extension, How Does Photo Place My view controller's view?

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Created Dec ’15

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When creating a Photos extension on OS X, I see my view controller's view gets placed at frame origin 0, 0, so it hugs the lower left.

How do I tell Photos to center my view controller's view? I tried doing it manually, and it doesn't work (if it did it would be kind of dirty because the parent should do it).

I also tried setting preferredScreenOrigin but that doesn't seem to work with Photo Extensions.

Answered by Macho Man Randy Savage in 96284022

The view controller for my Photos extension inherits from a view controller for another extension, which sets the preferred content size. Setting that property clamps the view controller at a smaller size than the frame Photos gives me, which would be fine if I could tell Photos to center my view controller.

If I don't set the preferred content size on the view controller, my view controller's view is full-sized in its container. So I guess the right approach would be to have my Photo extension view controller be full sized...and then wrap a smaller subview, and center that subview.

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Macho Man Randy Savage OP

Dec ’15

Accepted Answer

The view controller for my Photos extension inherits from a view controller for another extension, which sets the preferred content size. Setting that property clamps the view controller at a smaller size than the frame Photos gives me, which would be fine if I could tell Photos to center my view controller.

If I don't set the preferred content size on the view controller, my view controller's view is full-sized in its container. So I guess the right approach would be to have my Photo extension view controller be full sized...and then wrap a smaller subview, and center that subview.

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