Prevents app from crashing when performing updates on UITable/CollectionView that is not in view hierarchy.

Author: kzaher

Sources/DataSources+Rx/RxCollectionViewSectionedAnimatedDataSource.swift

@@ -57,6 +57,11 @@ open class RxCollectionViewSectionedAnimatedDataSource<S: AnimatableSectionModel
         UIBindingObserver(UIElement: self) { dataSource, newSections in
             let oldSections = dataSource.sectionModels
             do {
+                // if view is not in view hierarchy, performing batch updates will crash the app
+                if collectionView.window == nil {
+                    collectionView.reloadData()
+                    return
+                }
                 let differences = try differencesForSectionedView(initialSections: oldSections, finalSections: newSections)
 
                 for difference in differences {

Sources/DataSources+Rx/RxTableViewSectionedAnimatedDataSource.swift

@@ -38,6 +38,11 @@ open class RxTableViewSectionedAnimatedDataSource<S: AnimatableSectionModelType>
             }
             else {
                 DispatchQueue.main.async {
+                    // if view is not in view hierarchy, performing batch updates will crash the app
+                    if tableView.window == nil {
+                        tableView.reloadData()
+                        return
+                    }
                     let oldSections = dataSource.sectionModels
                     do {
                         let differences = try differencesForSectionedView(initialSections: oldSections, finalSections: newSections)