WIP: Auto diffing section controller

CHANGELOG.md

@@ -24,10 +24,15 @@ This release closes the [3.0.0 milestone](https://github.com/Instagram/IGListKit
 
 - Changed `hasChanges` methods in `IGListIndexPathResult` and `IGListIndexSetResult` to read-only properties. [Bofei Zhu](https://github.com/zhubofei) [(#453)](https://github.com/Instagram/IGListKit/pull/453)
 
+- Replaced `IGListGridCollectionViewLayout` with `IGListCollectionViewLayout`. [[Ryan Nystrom](https://github.com/rnystrom) [(tbd)](https://github.com/Instagram/IGListKit/pull/tbd)
+
 ### Enhancements
 
-- Empty Views now move with Refresh Controls, and no longer use the `_collectionView.backgroundView` property. [dshahidehpour](https://github.com/dshahidehpour) [(#462)](https://github.com/Instagram/IGListKit/pull/462)]
+- You can now manually move items (cells) within a section controller, ex: `[self.collectionContext moveInSectionController:self fromIndex:0 toIndex:1]`. [Ryan Nystrom](https://github.com/rnystrom) [(#418)](https://github.com/Instagram/IGListKit/pull/418)
+
+### Fixes
 
+- Gracefully handle a `nil` section controller returned by an `IGListAdapterDataSource`. [Ryan Nystrom](https://github.com/rnystrom) [(tbd)](https://github.com/Instagram/IGListKit/pull/tbd)
 
 2.2.0
 -----
@@ -38,6 +43,8 @@ This release closes the [2.2.0 milestone](https://github.com/Instagram/IGListKit
 
 - Added `-[IGListAdapter visibleCellsForObject:]` API. [Sherlouk](https://github.com/Sherlouk) [(#442)](https://github.com/Instagram/IGListKit/pull/442)
 
+- Added `-[IGListAdapter sectionControllerForSection:]` API. [Adlai-Holler](https://github.com/Adlai-Holler) [(#477)](https://github.com/Instagram/IGListKit/pull/477)
+
 ### Fixes
 
 - Fix bug where emptyView's hidden status is not updated after the number of items is changed with `insertInSectionController:atIndexes:` or related methods. [Peter Edmonston](https://github.com/edmonston) [(#395)](https://github.com/Instagram/IGListKit/pull/395)
@@ -46,9 +53,9 @@ This release closes the [2.2.0 milestone](https://github.com/Instagram/IGListKit
 
 - Fix bug where `-[UICollectionViewCell ig_setStackedSectionControllerIndex:]` should use `OBJC_ASSOCIATION_COPY_NONATOMIC` for NSNumber. [PhilCai](https://github.com/PhilCai1993) [(#424)](https://github.com/Instagram/IGListKit/pull/426)
 
-- Fix potential bug with suppressing animations (by passing `NO`) during `-[IGListAdapter performUpdatesAnimated: completion:]` where user would see UI glitches/flashing. [Jesse Squires](https://github.com/jessesquires) [(tbd)]()
+- Fix potential bug with suppressing animations (by passing `NO`) during `-[IGListAdapter performUpdatesAnimated: completion:]` where user would see UI glitches/flashing. [Jesse Squires](https://github.com/jessesquires) [(019c990)](https://github.com/Instagram/IGListKit/commit/019c990312eea4203c7388a83b50685d426aa372)
 
-- Fix bug where scroll position would be incorrect in call to `-[IGListAdapter scrollToObject:supplementaryKinds:scrollDirection:scrollPosition:animated:` with scrollDirection/scrollPosition of UICollectionViewScrollDirectionVertical/UICollectionViewScrollPositionCenteredVertically or UICollectionViewScrollDirectionHorizontal/UICollectionViewScrollPositionCenteredHorizontally and with a collection view with nonzero contentInset. [David Yamnitsky](https://github.com/nitsky)
+- Fix bug where scroll position would be incorrect in call to `-[IGListAdapter scrollToObject:supplementaryKinds:scrollDirection:scrollPosition:animated:` with scrollDirection/scrollPosition of UICollectionViewScrollDirectionVertical/UICollectionViewScrollPositionCenteredVertically or UICollectionViewScrollDirectionHorizontal/UICollectionViewScrollPositionCenteredHorizontally and with a collection view with nonzero contentInset. [David Yamnitsky](https://github.com/nitsky) [(5cc0fcd)](https://github.com/Instagram/IGListKit/commit/5cc0fcd1d77d6296f57ce1c298301b9881cb4d4a)
 
 2.1.0
 -----
@@ -121,6 +128,10 @@ You can find a [migration guide here](https://instagram.github.io/IGListKit/migr
               animated:(BOOL)animated;
 ```
 
+### Fixes
+
+- Consider supplementary views with display and end-display events. [Ryan Nystrom](https://github.com/rnystrom) [(#470)](https://github.com/Instagram/IGListKit/pull/470)
+
 
 - Changed `NSUInteger` to `NSInteger` in all public APIs. [Suraya Shivji](https://github.com/surayashivji) [(#200)](https://github.com/Instagram/IGListKit/issues/200)
 

Examples/Examples-iOS/IGListKitExamples/Storyboard/Demo.storyboard

@@ -1,11 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="11542" systemVersion="16B2555" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="11762" systemVersion="16D32" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES">
     <device id="retina4_7" orientation="portrait">
         <adaptation id="fullscreen"/>
     </device>
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="11524"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="11757"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <scenes>
@@ -24,7 +24,7 @@
                             <collectionView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" dataMode="prototypes" translatesAutoresizingMaskIntoConstraints="NO" id="LKS-vo-Ytk" customClass="IGListCollectionView">
                                 <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
                                 <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
-                                <collectionViewLayout key="collectionViewLayout" id="fUa-Xb-tfX" customClass="IGListGridCollectionViewLayout">
+                                <collectionViewLayout key="collectionViewLayout" id="fUa-Xb-tfX" customClass="IGListCollectionViewLayout">
                                     <userDefinedRuntimeAttributes>
                                         <userDefinedRuntimeAttribute type="number" keyPath="minimumLineSpacing">
                                             <real key="value" value="1"/>