Add support for UICollectionView introspection

[chrismaddern]

iOS 16 has migrated List to use UICollectionView under the hood (at least in some cases.)

This is a very simple addition to add support for UICollectionView introspection.

[davdroman]

Adding some tests. Will merge shortly.

[chrismaddern]

oh, amazing! 🥳

glad to be of help... and thrilled to be back on main

[X901]

if my app support ios15 and ios16
will it be use UITableView for ios15 and UICollectionView for ios16 ?
or I should add if condition ?

[davdroman]

@X901 yes, you will need to introspect them both separatedly.

For this particular case, I don't think you'll need to add an #if available condition, as it's almost always going to be one or the other. In the cases where you do need to distinguish between platforms, here's a quick workaround you can use for now:

// add this to your codebase
extension View {
	func availability<Transformed: View>(
		@ViewBuilder _ transform: (Self) -> Transformed
	) -> Transformed {
		transform(self)
	}
}

[...]

struct YourView {
	var body: some View {
		List {
			[...]
		}
		.availability {
			if #available(iOS 16, *) {
				$0.introspectCollectionView { collectionView in
					[...]
				}
			} else {
				$0.introspectTableView { tableView in
					[...]
				}
			}
		}
	}
}

I have some ideas on how to improve the ergonomics of introspecting the same SwiftUI component in different OS versions, but I'm yet to explore them when I get some spare time.

[X901]

@X901 yes, you will need to introspect them both separatedly.

For this particular case, I don't think you'll need to add an #if available condition, as it's almost always going to be one or the other. In the cases where you do need to distinguish between platforms, here's a quick workaround you can use for now:

// add this to your codebase
extension View {
	func availability<Transformed: View>(
		@ViewBuilder _ transform: (Self) -> Transformed
	) -> Transformed {
		transform(self)
	}
}

[...]

struct YourView {
	var body: some View {
		List {
			[...]
		}
		.availability {
			if #available(iOS 16, *) {
				$0.introspectCollectionView { collectionView in
					[...]
				}
			} else {
				$0.introspectTableView { tableView in
					[...]
				}
			}
		}
	}
}

I have some ideas on how to improve the ergonomics of introspecting the same SwiftUI component in different OS versions, but I'm yet to explore them when I get some spare time.

Thank you, you give me A great idea 👍

[fascinated]

thanks for sharing this snippet, really helped me get this working with Lists in 15 and 16. <3