Add asserts to IGListAdapter

Summary: Fix #91 Closes #108 Differential Revision: D4063183 Pulled By: rnystrom fbshipit-source-id: 8ff4a5ac3bf7418cb968093e9f87b7fc55bc2fe1
Instagram · Oct 22, 2016 · a01e995 · a01e995
1 parent adbb21f
commit a01e995
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/Source/IGListAdapter.m b/Source/IGListAdapter.m
@@ -715,6 +715,7 @@ - (__kindof UICollectionViewCell *)dequeueReusableCellOfClass:(Class)cellClass
     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 @@ - (UICollectionViewCell *)dequeueReusableCellWithNibName:(NSString *)nibName
                                     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 @@ - (__kindof UICollectionReusableView *)dequeueReusableSupplementaryViewOfKind:(N
                                                                         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);