Summary:
* Issue: [IGListAdapter visibleSectionControllers] calls [UICollectionViewLayout layoutAttributesForElementsInRect:] which can be expensive. And since visibleSectionControllers is called in scrollViewDidScroll, it can add up and take a toll on scroll performance. On an iPhone 7, it's in 2-10% of the main-thread samples (using Time Profiler).
* Fix: IGListDisplayHandler conveniently keeps track of visible IGListSectionControllers, so let's just use that. Now, [IGListAdapter visibleSectionControllers] drops to ~0.3% of samples.
Reviewed By: rnystrom
Differential Revision: D6351474
fbshipit-source-id: 66914db95e08498927bfbceda4d2e9d58cbc7530
Summary:
Issue fixed: #655
- [x] All tests pass. Demo project builds and runs.
- [ ] I added tests, an experiment, or detailed why my change isn't tested.
- [ ] I added an entry to the `CHANGELOG.md` for any breaking changes, enhancements, or bug fixes.
- [x] I have reviewed the [contributing guide](https://github.com/Instagram/IGListKit/blob/master/.github/CONTRIBUTING.md)
I've also addressed a few cases where there was no empty line between the `param`s and `return`.
Closes https://github.com/Instagram/IGListKit/pull/665
Differential Revision: D4906215
Pulled By: jessesquires
fbshipit-source-id: 5693c85eb548644b0b0e2571eea8ff4d9f706b12
Summary:
This was a little bit of an invasive change with the display handler, but I think that this is the right call. When sending display events for objects, we should account for the supplementary view as part of the section controller. This is especially useful for headers and footers.
Note that this wont effect the working range API at all.
Fixes#300
Closes https://github.com/Instagram/IGListKit/pull/470
Differential Revision: D4551338
Pulled By: rnystrom
fbshipit-source-id: dda6fbf18bcfc2c941d80ee2314a543d1ab83843
