From a01e9954e3499a74c565516622ffa2f9e8348cab Mon Sep 17 00:00:00 2001
From: Bofei Zhu <bofeiz@andrew.cmu.edu>
Date: Fri, 21 Oct 2016 19:46:42 -0700
Subject: [PATCH] Add asserts to IGListAdapter

Summary:
Fix #91
Closes https://github.com/Instagram/IGListKit/pull/108

Differential Revision: D4063183

Pulled By: rnystrom

fbshipit-source-id: 8ff4a5ac3bf7418cb968093e9f87b7fc55bc2fe1
---
 Source/IGListAdapter.m | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Source/IGListAdapter.m b/Source/IGListAdapter.m
index 68ce3138..e35ad6b6 100644
--- a/Source/IGListAdapter.m
+++ b/Source/IGListAdapter.m
@@ -715,6 +715,7 @@
     IGAssertMainThread();
     IGParameterAssert(sectionController != nil);
     IGParameterAssert(cellClass != nil);
+    IGParameterAssert(index >= 0);
     UICollectionView *collectionView = self.collectionView;
     IGAssert(collectionView != nil, @"Reloading adapter without a collection view.");
     NSString *identifier = IGListReusableViewIdentifier(cellClass, nil, nil);
@@ -731,7 +732,9 @@
                                     forSectionController:(IGListSectionController<IGListSectionType> *)sectionController
                                                  atIndex:(NSInteger)index {
     IGAssertMainThread();
+    IGParameterAssert(nibName != nil);
     IGParameterAssert(sectionController != nil);
+    IGParameterAssert(index >= 0);
     UICollectionView *collectionView = self.collectionView;
     IGAssert(collectionView != nil, @"Reloading adapter without a collection view.");
     NSIndexPath *indexPath = [self indexPathForSectionController:sectionController index:index];
@@ -748,6 +751,10 @@
                                                                         class:(Class)viewClass
                                                                       atIndex:(NSInteger)index {
     IGAssertMainThread();
+    IGParameterAssert(elementKind.length > 0);
+    IGParameterAssert(sectionController != nil);
+    IGParameterAssert(viewClass != nil);
+    IGParameterAssert(index >= 0);
     UICollectionView *collectionView = self.collectionView;
     IGAssert(collectionView != nil, @"Reloading adapter without a collection view.");
     NSString *identifier = IGListReusableViewIdentifier(viewClass, nil, elementKind);