Add support for headers and footers

[geoffnix]

This project is awesome and saved me a lot of time. One thing missing was support for layouts with headers and footers. Here's what I changed to support my app.

[wtmoose]

Geoff,

I’m glad you found this useful and I appreciate the contribution.

But…

I actually added support for supplementary views last week! See https://github.com/wtmoose/TLLayoutTransitioning/issues/8

If you haven’t already done so, check out the new features in version 1.0.0:

Changes in 1.0.0

• Support for supplementary views
• Fine-tune toContentOffset even further with additional configuration options:
  • placementAnchor a relative anchor point for the placement calculation
  • placementInset an inset of the collection view frame for the placement calculation
  • toSize the expected final collection view size (allows for transitioning to a different size)
  • toContentInset the expected final content inset (allows for transitioning to a different inset)
• New Visible placement option: like Minimal, but ensures content visibility
• Ability to cancel the transition in place. Can be used to react smoothly to user input or screen rotation while the transition is in flight.
• Linear transitionTime property added to TLTransitionLayout for fine-tuning transition of elements, such as those that need to follow a different easing curve, delayed transition start, or different transition duration
• New function TLConvertTimespace for transitioning elements with simulated delay and duration relative to the overall transition progress
• New function TLRelativePointInRect for calculating a relative point for a given rect and point. Useful for the new placementAnchor option.
• Several bug fixes.

I will take a look through your implementation to see if there is anything I can merge in.

One improvement I want to make is to have the transition layout automatically determine the supplementary view kinds (in my implementation, you have to provide a list to the constructor).

Best,

Tim

On Apr 22, 2014, at 2:12 PM, geoffnix notifications@github.com wrote:

This project is awesome and saved me a lot of time. One thing missing was support for layouts with headers and footers. Here's what I changed to support my app.

You can merge this Pull Request by running

git pull https://github.com/modcloth/TLLayoutTransitioning header_support Or view, comment on, or merge it at:

https://github.com/wtmoose/TLLayoutTransitioning/pull/9

Commit Summary

Add support for headers and footers File Changes

M TLLayoutTransitioning/TLTransitionLayout.m (46) Patch Links:

https://github.com/wtmoose/TLLayoutTransitioning/pull/9.patch https://github.com/wtmoose/TLLayoutTransitioning/pull/9.diff — Reply to this email directly or view it on GitHub.

[geoffnix]

Awesome thanks - I forked just a few days too early, I think.

FWIW, I couldn't find a way to automatically determine what supplementary views are in use. For headers and footers you can call "layoutAttributesForSupplementaryViewOfKind:atIndex" for headers and footers for each section - and ignore nil responses. But I could find no way to get other decoration views.

Good luck, and thanks again for a great project.

[wtmoose]

FWIW, I couldn't find a way to automatically determine what supplementary views are in use.

Yeah I was thinking about that. UICollectionViewLayoutAttributes has a representedElementKind property. So I think if you call layoutAttributesForElementsInRect: with a big enough rect to get everything, you can get the list of kinds by inspecting representedElementKinds. There's also representedElementCategory property, so you know the element type.