How to pass generic views to a struct in SwiftUI

Question

I get the error Failed to produce diagnostic for expression; please file a bug report for the following code. It seems to me pretty straight forward, but probably it has something to do with generics. How to pass generic views to a struct?

In a SwiftUI view I have this:

import SwiftUI

struct PageView<Page: View>: View {
    var views: [UIHostingController<Page>]

    init(_ views: [Page]) {
        self.views = views.map { UIHostingController(rootView: $0) }
    }

    var body: some View {
        Text("Page View")
    }
}

struct View1: View {
    var body: some View {
        Text("View 1")
    }
}

struct View2: View {
    var body: some View {
        Text("View 2")
    }
}

struct Reference: View {
    var body: some View {             // <- Error here
        PageView([View1(), View2()])
    }
}

This is because your PageView expects an array of views of a generic type Page. However, in your code you're passing two different types: View1 and View2. — pawello2222
– pawello2222, Commented Oct 8, 2020 at 12:16
Btw this might help you: How can I implement PageView in SwiftUI? — pawello2222
– pawello2222, Commented Oct 8, 2020 at 12:18
@pawello2222 Right, but how can I tell "Accept an array of objects, each implementing View"? — pistacchio
– pistacchio, Commented Oct 8, 2020 at 12:33

Asperi · Accepted Answer · 2020-10-08 12:17:58Z

2

Here is possible solution

struct Reference: View {
    var body: some View {             
        PageView([AnyView(View1()), AnyView(View2())])
    }
}

answered Oct 8, 2020 at 12:17

Asperi

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