I am targeting iOS17 and using @Observable.
I have an array of items, and I want to present a sheet when the array is greater than zero.
My @Observable looks like this:
@Observable class BStoreOO {
var items: [Int] = []
var showBS: Bool { items.isEmpty }
func updateItems(newItems: [Int]) {
self.items = newItems
}
}
When this array gets added to, from another view, I would like to present a sheet/popover.
Inside my ContentView I have a @State `... that uses that @Observable
struct ContentView: View {
@State var bStore = BStoreOO()
Further down in my View, how should I toggle this view on the basis of the observed array not being empty? I have tried a number of ways. Some error, some don't, but none present the sheet!
For example:
.popover(isPresented: bStore.showBS) {
PopoverContent()
}
Gives the error "Cannot convert value of type 'Bool' to expected argument type 'Binding'"
If I add a State like this: @State private var isShowingBS = false
and then add this:
.onChange(of: bStore.items) {
self.isShowingBS = self.bStore.items.count > 0
}
I don't get errors but nothing is presented.
What is the correct way to bind the presentation of the sheet to whether the observed items array is empty or not?
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