I use a ViewBuilder to generate the destination used in a NavigationSplitView (to select the detail View).
This viewBuilder depends on a parameter (in fact 2, but I try to simplify).
ViewBuilder is simple, just calls a View:
@ViewBuilder func destination(object: SomeObject, name: String) -> some View {
MyView(objToUse: object, nameToUse: name)
}
But this does not work. When I change the selection in the Master of the splitView, view is not updated (even though I've checked the content is updated.
This si so simple that I started using directly
MyView(objToUse: object, nameToUse: name)
in the detail View.
It did not work either.
Now, here is the surprise: if I use a switch statement in the ViewBuilder, it works:
Let's say we have:
struct SomeContent: Hashable, Identifiable, Codable {
var id = UUID()
var name: String
}
struct Object : Hashable, Identifiable, Equatable, Codable {
var id = UUID()
var content: [SomeContent] = []
}
So I define a func to get all the names
func allNames(of object: SomeObject) -> [String] {
var names : [String] = []
for o in object.content {
names.append(o.name)
}
return names
}
And modify ViewBuilder as follows: it works
@ViewBuilder func destination(object: SomeObject, name: String) -> some View {
let names : [String] = allNames(of: object)
switch name {
case names[0]: MyView(objToUse: object, nameToUse: name)
case names[1]: MyView(objToUse: object, nameToUse: name)
case names[2]: MyView(objToUse: object, nameToUse: name)
default: EmptyView()
}
It also works with nested if else if instead of a switch.
What is it I am missing ?
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