add: UITableView, UICollectionView prefetching publisher

Sources/CombineCocoa/Controls/UICollectionView+Combine.swift

@@ -77,10 +77,29 @@ public extension UICollectionView {
             .map { ($0[1] as! UICollectionReusableView, $0[2] as! String, $0[3] as! IndexPath) }
             .eraseToAnyPublisher()
     }
+
+    /// Combine wrapper for `tableView(_:prefetchRowsAt:)`
+    var prefetchItemsAtPublisher: AnyPublisher<[IndexPath], Never> {
+        return (prefetchingDelegateProxy as! CollectionViewDataSourcePrefetchingProxy)
+            .prefetchItemsSubject
+            .eraseToAnyPublisher()
+    }
+
+    /// Combine wrapper for `tableView(_:cancelPrefetchingForRowsAt:)`
+    var cancelPrefetchingForItemsAtPublisher: AnyPublisher<[IndexPath], Never> {
+        let selector = #selector(UICollectionViewDataSourcePrefetching.collectionView(_:cancelPrefetchingForItemsAt:))
+        return prefetchingDelegateProxy.interceptSelectorPublisher(selector)
+            .map { ($0[1]) as! [IndexPath] }
+            .eraseToAnyPublisher()
+    }
 
     override var delegateProxy: DelegateProxy {
         CollectionViewDelegateProxy.createDelegateProxy(for: self)
     }
+
+    var prefetchingDelegateProxy: DelegateProxy {
+        CollectionViewDataSourcePrefetchingProxy.createDelegateProxy(for: self)
+    }
 }
 
 @available(iOS 13.0, *)
@@ -89,5 +108,18 @@ private class CollectionViewDelegateProxy: DelegateProxy, UICollectionViewDelega
         object.delegate = self
     }
 }
+
+@available(iOS 13.0, *)
+internal class CollectionViewDataSourcePrefetchingProxy: DelegateProxy, UICollectionViewDataSourcePrefetching, DelegateProxyType {
+    internal let prefetchItemsSubject = PassthroughSubject<[IndexPath], Never>()
+
+    func setDelegate(to object: UICollectionView) {
+        object.prefetchDataSource = self
+    }
+
+    func collectionView(_ collectionView: UICollectionView, prefetchItemsAt indexPaths: [IndexPath]) {
+        prefetchItemsSubject.send(indexPaths)
+    }
+}
 #endif
 // swiftlint:enable force_cast

Sources/CombineCocoa/Controls/UITableView+Combine.swift

@@ -117,10 +117,29 @@ public extension UITableView {
             .map { $0[1] as! IndexPath }
             .eraseToAnyPublisher()
     }
+
+    /// Combine wrapper for `tableView(_:prefetchRowsAt:)`
+    var prefetchItemsAtPublisher: AnyPublisher<[IndexPath], Never> {
+        return (prefetchingDelegateProxy as! TableViewDataSourcePrefetchingProxy)
+            .prefetchItemsSubject
+            .eraseToAnyPublisher()
+    }
+
+    /// Combine wrapper for `tableView(_:cancelPrefetchingForRowsAt:)`
+    var cancelPrefetchingForItemsAtPublisher: AnyPublisher<[IndexPath], Never> {
+        let selector = #selector(UITableViewDataSourcePrefetching.tableView(_:cancelPrefetchingForRowsAt:))
+        return prefetchingDelegateProxy.interceptSelectorPublisher(selector)
+            .map { ($0[1]) as! [IndexPath] }
+            .eraseToAnyPublisher()
+    }
 
     override var delegateProxy: DelegateProxy {
         TableViewDelegateProxy.createDelegateProxy(for: self)
     }
+
+    var prefetchingDelegateProxy: DelegateProxy {
+        TableViewDataSourcePrefetchingProxy.createDelegateProxy(for: self)
+    }
 }
 
 @available(iOS 13.0, *)
@@ -129,5 +148,18 @@ private class TableViewDelegateProxy: DelegateProxy, UITableViewDelegate, Delega
         object.delegate = self
     }
 }
+
+@available(iOS 13.0, *)
+internal class TableViewDataSourcePrefetchingProxy: DelegateProxy, UITableViewDataSourcePrefetching, DelegateProxyType {
+    internal let prefetchItemsSubject = PassthroughSubject<[IndexPath], Never>()
+
+    func setDelegate(to object: UITableView) {
+        object.prefetchDataSource = self
+    }
+
+    func tableView(_ tableView: UITableView, prefetchRowsAt indexPaths: [IndexPath]) {
+        prefetchItemsSubject.send(indexPaths)
+    }
+}
 #endif
 // swiftlint:enable force_cast