Add support for UICollectionView introspection (#169)

Co-authored-by: David Roman <[email protected]>

Author: chrismaddern

Introspect/ViewExtensions.swift

@@ -97,6 +97,16 @@ extension View {
         introspect(selector: TargetViewSelector.ancestorOrSiblingContaining, customize: customize)
     }
 
+    /// Finds a `UICollectionView` from a `SwiftUI.List`, or `SwiftUI.List` child.
+    public func introspectCollectionView(customize: @escaping (UICollectionView) -> ()) -> some View {
+        introspect(selector: TargetViewSelector.ancestorOrSiblingContaining, customize: customize)
+    }
+
+    /// Finds a `UICollectionView` from a `SwiftUI.List`, or `SwiftUI.List` child. You can attach this directly to the element inside the list.
+    public func introspectCollectionViewCell(customize: @escaping (UICollectionViewCell) -> ()) -> some View {
+        introspect(selector: TargetViewSelector.ancestorOrSiblingContaining, customize: customize)
+    }
+
     /// Finds a `UIScrollView` from a `SwiftUI.ScrollView`, or `SwiftUI.ScrollView` child.
     public func introspectScrollView(customize: @escaping (UIScrollView) -> ()) -> some View {
         if #available(iOS 14.0, tvOS 14.0, macOS 11.0, *) {

IntrospectTests/UIKitTests.swift

@@ -152,22 +152,42 @@ private struct ListTestView: View {
     let spyCell2: () -> Void
 
     var body: some View {
-        List {
-            Text("Item 1")
-            Text("Item 2")
-                .introspectTableView { tableView in
-                    self.spy2()
-                }
-                .introspectTableViewCell { cell in
-                    self.spyCell2()
-                }
-            
-        }
-        .introspectTableView { tableView in
-            self.spy1()
-        }
-        .introspectTableViewCell { cell in
-            self.spyCell1()
+        if #available(iOS 16, tvOS 16, macOS 13, *) {
+            List {
+                Text("Item 1")
+                Text("Item 2")
+                    .introspectCollectionView { tableView in
+                        self.spy2()
+                    }
+                    .introspectCollectionViewCell { cell in
+                        self.spyCell2()
+                    }
+
+            }
+            .introspectCollectionView { tableView in
+                self.spy1()
+            }
+            .introspectCollectionViewCell { cell in
+                self.spyCell1()
+            }
+        } else {
+            List {
+                Text("Item 1")
+                Text("Item 2")
+                    .introspectTableView { tableView in
+                        self.spy2()
+                    }
+                    .introspectTableViewCell { cell in
+                        self.spyCell2()
+                    }
+
+            }
+            .introspectTableView { tableView in
+                self.spy1()
+            }
+            .introspectTableViewCell { cell in
+                self.spyCell1()
+            }
         }
     }
 }