Hi
I really liked the video by Paul Lettieri, creating a replacement for HStack that gives equal width to each, so I wrote one for my app. But the app doesn't compile for me. It gives me "Trailing closure passed to parameter of type 'HorizontalAlignment' that does not accept a closure" against the top VStack, not the place where the equal lengths HStack replacement appears.
This is my version of his struct:
extension LayoutSubviews {
func maxSize() -> CGSize {
let subviewSizes = map { $0.sizeThatFits(.unspecified) }
return subviewSizes.reduce(CGSize.zero) { CGSize(width: Swift.max($0.width, $1.width), height: Swift.max($0.height, $1.height)) }
}// maxSize()
func spacing() -> [Double] {
return indices.map { index in
guard index < count - 1 else { return 0.0 }
return self[index].spacing.distance(to: self[index + 1].spacing, along: .horizontal)
}
}// spacing()
}// extension LayoutSubviews
struct EqualWidthHStack: Layout {
func sizeThatFits(proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) -> CGSize {
let maxsize = subviews.maxSize()
let totalSpacing = subviews.spacing().reduce(0) { $0 + $1 }
return CGSize(width: maxsize.width * Double(subviews.count) + totalSpacing, height: maxsize.height)
}// sizeThatFits
func placeSubviews(in bounds: CGRect, proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) {
let maxsize = subviews.maxSize()
let spacing = subviews.spacing()
let sizeProposal = ProposedViewSize(width: maxsize.width, height: maxsize.height)
var x = bounds.minX + maxsize.width / 2
for index in subviews.indices {
subviews[index].place(at: CGPoint(x: x, y: bounds.midX), anchor: .center, proposal: sizeProposal)
x += maxsize.width + spacing[index]
}
}// placeSubviews
}// EqualWidthHStack
I wrote this trivial View to test it:
struct ContentView: View {
var body: some View {
VStack {
HStack {
Button("Hi") { print("Hi!") }
Button("Hello") { print("Hello!") }
Button("Good evening") { print("Good evening!") }
}
EqualWidthHStack {
Button("Hi") { print("Hi!") }
Button("Hello") { print("Hello!") }
Button("Good evening") { print("Good evening!") }
}
Image(systemName: "globe")
.imageScale(.large)
.foregroundColor(.accentColor)
Text("Hello, world!")
}
}
}
I'm using Version 14.0 beta 2 (14A5229c) of Xcode. I was having a problem with the exact same message in another app with a much more complex main view.
I hope someone can tell me what to do or what is going on here.
Regards,
Mark
