Use Toolbar in UIHostingConfiguration

Question

Created Jul ’22

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Hello! I'm working with the UIHostingConfiguration and would like to set a Toolbar for a TextField which I placed in the content. I've tried to set ToolbarRole and Toolbar Visibility. Unfortunately, it doesn't work. Here's my example code:

Cell:

cell.configurationUpdateHandler = { (cell, state) in
    cell.contentConfiguration = UIHostingConfiguration {
         RowView(item: item)
     }
}

View:


    @ObservedObject var item: Movie

    var body: some View {
        TextField("Title", text: $item.title)
            .toolbar(content: {
                ToolbarItem(placement: .keyboard) {
                    Button("Confirm", action: {})
                }
            })
            .toolbar(.visible, in: .automatic)
    }
}

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Answer 1

Frameworks Engineer OP

Apple

Jul ’22

Accepted Answer

The .toolbar modifier is not supported inside UIHostingConfiguration. This is because the SwiftUI toolbar API requires a connection to the view controller hierarchy in UIKit, and UIHostingConfiguration does not interface with any UIViewController in the UIKit part of your app.

You need to use UIHostingController in order to use features in SwiftUI that rely on a connection to the view controller hierarchy in UIKit, including any SwiftUI view that relies on UIViewControllerRepresentable internally. You can learn more about the differences between UIHostingConfiguration and UIHostingController in the Use SwiftUI with UIKit video from WWDC22.

If you have a need to use view controller dependent feature(s) of SwiftUI inside of a collection or table view cell, you may need to continue using UIKit to implement that specific cell instead, since UIHostingController is not supported inside of cells. There is nothing wrong with using a mix of cells implemented with SwiftUI (using UIHostingConfiguration) and cells implemented purely with UIKit in the same collection or table view — just remember to use separate cell registrations (or reuse identifiers) for different types of cells.

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