swift - Spacer not working with Form inside a VStack

Question

I'm trying to get a circle on top with the form content down below, right above my TabBar. I can somewhat force this by using .frame() but I'm not a big fan of that. It seems like there should be a simpler way in order to align it to the bottom.

My understanding is that Spacer() should push the form towards the bottom and leave the circle at the top, but this doesn't seem to be the case.

var body: some View {
    VStack {
        Circle().foregroundColor(.yellow).overlay(VStack {
            Text("Example")
        }).foregroundColor(.primary)
        
        Spacer()
        
        Form {
            TextField("test", text: $a)
            TextField("test2", text: $b)
        }
    }
}

Answer 1

All scrollviews(which Form has built on) and shapes(which Circle is) are greedy in layout priority. They don't have inner limitations so if there's available space whey gonna take it

Spacer is greedy too, but it has lower priority then other greedy views

That's why in your case Form and Circle are splitting available space 50% to 50%

You need to restrict both their height to make it work.

VStack {
    Circle().foregroundColor(.yellow).overlay(VStack {
        Text("Example")
    }).foregroundColor(.primary)
    .frame(height: UIScreen.main.bounds.width)
    
    Spacer()
    
    Form {
        TextField("test", text: $a)
        TextField("test2", text: $b)
    }.frame(height: 150)
}