NEW: Join my free 100 Days of SwiftUI challenge today! >>

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

Paul Hudson    @twostraws   

Fully updated for Xcode 11.2

SwiftUI allows a maximum of 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")
    }
}

LEARN SWIFTUI FOR FREE I have a massive, free SwiftUI video collection on YouTube teaching you how to build complete apps with SwiftUI – check it out!

Similar solutions…

BUY OUR BOOKS
Buy Pro Swift Buy Swift Design Patterns Buy Testing Swift Buy Hacking with iOS Buy Swift Coding Challenges Buy Swift on Sundays Volume One Buy Server-Side Swift (Vapor Edition) Buy Advanced iOS Volume One Buy Advanced iOS Volume Two Buy Advanced iOS Volume Three Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with macOS Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Server-Side Swift (Kitura Edition) Buy Beyond Code

Was this page useful? Let us know!

Average rating: 5.0/5