From 145327647b69ae3ab2dd2a84a9bbbcf78d5f41a4 Mon Sep 17 00:00:00 2001
From: Jesse Squires <jsq@instagram.com>
Date: Wed, 19 Apr 2017 12:58:58 -0700
Subject: [PATCH] Invalidate layout when collection view reused between
 IGListAdapters

Summary:
Closes #659
Closes https://github.com/Instagram/IGListKit/pull/677

Differential Revision: D4915322

Pulled By: jessesquires

fbshipit-source-id: 2ae6ff4ee1726fe2395233d7d662c0b12956a746
---
 CHANGELOG.md           | 2 ++
 Source/IGListAdapter.m | 1 +
 2 files changed, 3 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index a6178113b..1fb2bfb4d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -104,6 +104,8 @@ This release closes the [3.0.0 milestone](https://github.com/Instagram/IGListKit
 
 - `IGListSectionType` protocol was removed and its methods were absorted into the `IGListSectionController` base class with default implementations. [Ryan Nystrom](https://github.com/rnystrom) (tbd)
 
+- When setting the collection view on `IGListAdapter`, its layout is now properly invalidated. [Jesse Squires](https://github.com/jessesquires) [(#677)](https://github.com/Instagram/IGListKit/pull/677)
+
 2.1.0
 -----
 
diff --git a/Source/IGListAdapter.m b/Source/IGListAdapter.m
index 4fff8edbb..21b8cccf2 100644
--- a/Source/IGListAdapter.m
+++ b/Source/IGListAdapter.m
@@ -83,6 +83,7 @@ - (void)setCollectionView:(UICollectionView *)collectionView {
 
         _collectionView = collectionView;
         _collectionView.dataSource = self;
+        [_collectionView.collectionViewLayout invalidateLayout];
 
         [self updateCollectionViewDelegate];
         [self updateAfterPublicSettingsChange];