How can I add a custom container view in SwiftUI

SwiftUI implements this with the ViewBuilder @functionBuilder

struct HGrid <Content: View>: View {
    init(@ViewBuilder builder: () -> Content) {
        let content = builder()
        ...
    }
}

See also

• https://forums.swift.org/t/function-builders/25167
• https://github.com/apple/swift-evolution/pull/1046