SWIFTUI Call Key Dictionary not work with the error: 'Subscript index of type '() -> Bool' in a key path must be Hashable' - dictionary

Question

I have this view:
import SwiftUI
struct SectionView1: View {
let dateStr:String
#Binding var isSectionView:Bool
var body: some View {
HStack {
Button(action: {
self.isSectionView.toggle()
}) {
Image(systemName: isSectionView ? "chevron.down.circle" : "chevron.right.circle")
}
Text("Media del \(dateStr)")
}
}
}
which will be called from view:
import SwiftUI
import Photos
struct MediaView: View {
let geoFolder:GeoFolderCD
#State private var assetsForDate = [String :[PHAsset]]()
#State private var isSectionViewArray:[String:Bool] = [:]
var body: some View {
List {
ForEach(assetsForDate.keys.sorted(by: > ), id: \.self) { dateStr in
Section {
SectionView1(dateStr: dateStr,
isSectionView: self.$isSectionViewArray[dateStr, default: true])
}
}
}
.onAppear {
self.assetsForDate = FetchMediaUtility().fetchGeoFolderAssetsForDate(geoFolder: geoFolderStruct, numAssets: numMediaToFetch)
for dateStr in self.assetsForDate.keys.sorted() {
self.isSectionViewArray[dateStr] = true
}
}
}
}
but I have the error: Subscript index of type '() -> Bool' in a key path must be Hashable in isSectionView: self.$isSectionViewArray[dateStr, default: true]
Why isSectionViewArray:[String:Bool] = [:] is not Hasbable?
How can modify the code for work?
If I remove, in SectionView, #Binding var isSectionView:Bool, the code work fine, or if I set, from SectionView, #Binding var isSectionViewArray:[String:Bool] = [:], the code work fine.

Answer 1

You can write your own binding with the below code and it should work
var body: some View {
List {
ForEach(assetsForDate.keys.sorted(by: > ), id: \.self) { dateStr in
let value = Binding<Bool>(get: { () -> Bool in
return self.isSectionViewArray[dateStr, default: true]
}) { (value) in
}
Section {
SectionView1(dateStr: dateStr,
isSectionView: value)
}
}
}
.onAppear {
self.assetsForDate = FetchMediaUtility().fetchGeoFolderAssetsForDate(geoFolder: geoFolderStruct, numAssets: numMediaToFetch)
for dateStr in self.assetsForDate.keys.sorted() {
self.isSectionViewArray[dateStr] = true
}
}
}