Satisfying var body: some View in protocol extension-CodePudding

I wish to do the following:

import SwiftUI

protocol CombinedView: View {
    var dataForViewA: String { get }
    var viewA: any View { get }
    var viewB: any View { get }
}

extension CombinedView {
    var viewA: Text {
        Text(dataForViewA)
    }
    
    var body: some View {
        VStack {
            viewA
            viewB
        }
    }
}

viewA works fine because I can specify the concrete type, but var body complains:

Type 'any View' cannot conform to 'View'

I am unsure what I need to implement to solve this. Any ideas?

Thanks in advance for any advice

CodePudding user response：

It does not work that way, instead we need associated types for each generic view and specialisation in extension.

Here is fixed variant. Tested with Xcode 14b3 / iOS 16

protocol CombinedView: View {
    associatedtype AView: View
    associatedtype BView: View

    var dataForViewA: String { get }

    var viewA: Self.AView { get }
    var viewB: Self.BView { get }
}

extension CombinedView {
    var body: some View {
        VStack {
            viewA
            viewB
        }
    }
}

extension CombinedView where AView == Text {
    var viewA: Text {
        Text(dataForViewA)
    }
}