How to fix “Ambiguous reference to member 'buildBlock()’”

Paul Hudson    @twostraws    February 9th 2021

Updated for Xcode 12.5

SwiftUI allows up to 10 static children in each container, so if you try to add 11 or more you’ll get this error. To be clear, this means the following code is valid:

VStack {
    Text("SwiftUI")
    Text("SwiftUI")
    Text("SwiftUI")
    Text("SwiftUI")
    Text("SwiftUI")
    Text("SwiftUI")
    Text("SwiftUI")
    Text("SwiftUI")
    Text("SwiftUI")
    Text("SwiftUI")
}

But if you add a single more Text("SwiftUI") then the code will refuse to build.

To fix this problem, wrap your items in groups of 10 or fewer, like this:

VStack {
    Group {
        Text("SwiftUI")
        Text("SwiftUI")
        Text("SwiftUI")
        Text("SwiftUI")
        Text("SwiftUI")
        Text("SwiftUI")
    }

    Group {
        Text("SwiftUI")
        Text("SwiftUI")
        Text("SwiftUI")
        Text("SwiftUI")
        Text("SwiftUI")
    }
}

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