Add support catalyst

Author: ivanvorobei

Example/Controllers/SideBarController.swift

@@ -1,6 +1,6 @@
 import UIKit
 
-@available(iOS 14, *)
+@available(iOS 14, macCatalyst 14, *)
 class SidebarController: SPDiffableSideBarController {
 
     override func viewDidLoad() {
@@ -63,7 +63,7 @@ class SidebarController: SPDiffableSideBarController {
     }
 }
 
-@available(iOS 14, *)
+@available(iOS 14, macCatalyst 14, *)
 class SideBarSplitController: UISplitViewController {
 
     init() {

Sources/SPDiffable/CellProvider/Models/SPDiffableSnapshot.swift

@@ -30,5 +30,5 @@ public typealias SPDiffableSnapshot = NSDiffableDataSourceSnapshot<SPDiffableSec
 /**
  Wrapper of NSDiffableDataSourceSectionSnapshot  with basic `SPDiffableItem`.
  */
-@available(iOS 14, *)
+@available(iOS 14, macCatalyst 14, *)
 public typealias SPDiffableSectionSnapshot = NSDiffableDataSourceSectionSnapshot<SPDiffableItem>

Sources/SPDiffable/CellProvider/SPDiffableCollectionCellProviders.swift

@@ -6,7 +6,7 @@ public enum SPDiffableCollectionCellProviders {
      Defaults cell provider, which can help you doing side bar faster.
      You can do your providers and ise its with more flexible.
      */
-    @available(iOS 14, *)
+    @available(iOS 14, macCatalyst 14, *)
     public static var sideBar: SPDiffableCollectionCellProvider {
         let cellProvider: SPDiffableCollectionCellProvider = { (collectionView, indexPath, item) -> UICollectionViewCell? in
             let providers = [sideBarItem, sideBarButton, sideBarHeader]
@@ -20,7 +20,7 @@ public enum SPDiffableCollectionCellProviders {
         return cellProvider
     }
 
-    @available(iOS 14, *)
+    @available(iOS 14, macCatalyst 14, *)
     public static var sideBarItem: SPDiffableCollectionCellProvider {
         let cellProvider: SPDiffableCollectionCellProvider = { (collectionView, indexPath, item) -> UICollectionViewCell? in
             guard let item = item as? SPDiffableSideBarItem else { return nil }
@@ -36,7 +36,7 @@ public enum SPDiffableCollectionCellProviders {
         return cellProvider
     }
 
-    @available(iOS 14, *)
+    @available(iOS 14, macCatalyst 14, *)
     public static var sideBarButton: SPDiffableCollectionCellProvider {
         let cellProvider: SPDiffableCollectionCellProvider = { (collectionView, indexPath, item) -> UICollectionViewCell? in
             guard let item = item as? SPDiffableSideBarButton else { return nil }
@@ -49,7 +49,7 @@ public enum SPDiffableCollectionCellProviders {
         return cellProvider
     }
 
-    @available(iOS 14, *)
+    @available(iOS 14, macCatalyst 14, *)
     public static var sideBarHeader: SPDiffableCollectionCellProvider {
         let cellProvider: SPDiffableCollectionCellProvider = { (collectionView, indexPath, item) -> UICollectionViewCell? in
             guard let item = item as? SPDiffableSideBarHeader else { return nil }

Sources/SPDiffable/Collection/Models/SPDiffableSideBarButton.swift

@@ -26,7 +26,7 @@ import UIKit
 
  Colorful title usually.
  */
-@available(iOS 14, *)
+@available(iOS 14, macCatalyst 14, *)
 open class SPDiffableSideBarButton: SPDiffableItem {
 
     public let title: String

Sources/SPDiffable/Collection/Models/SPDiffableSideBarHeader.swift

@@ -24,7 +24,7 @@ import UIKit
 /**
  Header model for side bar item.
  */
-@available(iOS 14, *)
+@available(iOS 14, macCatalyst 14, *)
 open class SPDiffableSideBarHeader: SPDiffableItem {
 
     public var text: String

Sources/SPDiffable/Collection/Models/SPDiffableSideBarItem.swift

@@ -26,7 +26,7 @@ import UIKit
 
  For header use `SPDiffableSideBarHeader` class.
  */
-@available(iOS 14, *)
+@available(iOS 14, macCatalyst 14, *)
 open class SPDiffableSideBarItem: SPDiffableItem {
 
     public let title: String

Sources/SPDiffable/Collection/SPDiffableSideBarButtonCollectionViewListCell.swift

@@ -28,7 +28,7 @@ import UIKit
  Also not show background selection, but cell selected. Need deselect it manually.
  Configure it cell need via `updateWithItem` func.
  */
-@available(iOS 14, *)
+@available(iOS 14, macCatalyst 14, *)
 class SPDiffableSideBarButtonCollectionViewListCell: UICollectionViewListCell {
 
     private var item: SPDiffableSideBarButton? = nil

Sources/SPDiffable/Collection/SPDiffableSideBarController.swift

@@ -30,7 +30,7 @@ Basic side bar controller.
  Collection configuration setted to `.sidebar`.
  Layout detect data source and automatically set header and footer mode.
 */
-@available(iOS 14, *)
+@available(iOS 14, macCatalyst 14, *)
 open class SPDiffableSideBarController: UIViewController, UICollectionViewDelegate {
 
     public var collectionView: UICollectionView!