I'd like to calculate the line width of a shape inside a view based on the view's size. Looking through various posts here on StackOverflow, I think the solution is to use a GeometryReader like this:
struct MyView: View {
var body: some View {
GeometryReader { geometry in
// Here goes your view content,
// and you can use the geometry variable
// which contains geometry.size of the parent
// You also have function to get the bounds
// of the parent: geometry.frame(in: .global)
}
}
}
My question is, how can I define variables inside the GeometryReader construct to be used for the view? I've tried to put a var statement directly after the line "GeometryReader { geometry in", but this gives a compiler error.
This seems to be a function builder related bug (as of Beta 3), and I recommend filing feedback on it.
The workaround I've been using is to use GeometryProxy in a separate method with an explicit return.
var body: some View {
GeometryReader { proxy in
self.useProxy(proxy)
}
}
func useProxy(_ proxy: GeometryProxy) -> some View {
var width = proxy.size.width
return VStack {
// use width in here
}
}
I believe I'm still seeing this in beta 7.