I have a grid setup where I'm displaying multiple images which is working fine. Images are ordered by the date they're added, newest to oldest.
I'm trying to set it up so that the user can change the sort order themselves but am having trouble getting the view to update.
I'm setting the fetch request using oldest to newest as default when initialising the view, then when its appears updating the sort descriptor
struct ProjectImagesListView: View {
@Environment(\.managedObjectContext) private var viewContext
var project : Project
let columns = [
GridItem(.flexible()),
GridItem(.flexible()),
GridItem(.flexible()),
GridItem(.flexible())
]
@FetchRequest var pictures: FetchedResults<Picture>
var body: some View {
ScrollView {
LazyVGrid(columns: columns) {
ForEach(pictures) { picture in
NavigationLink(destination: ProjectImageDetailView(picture: picture)) {
if let pictureData = picture.pictureThumbnailData, let uiImage = UIImage(data: pictureData) {
Image(uiImage: uiImage)
.resizable()
.scaledToFit()
.frame(height: 100)
} else {
Image("missing")
.resizable()
.scaledToFit()
.frame(height: 100)
}
}
}
}
}
.navigationBarTitle("\(project.name ?? "") Images", displayMode: .inline)
.onAppear() {
guard let sortOrder = getSettingForPhotoOrder() else { return }
guard let sortOrderValue = sortOrder.settingValue else { return }
NSLog("sortOrderPhotos: \(String(describing: sortOrder.settingValue))")
if sortOrderValue == "Newest" {
NSLog("sortOrderPhotos: Change from default")
let newSortDescriptor = NSSortDescriptor(keyPath: \Picture.dateTaken, ascending: false)
pictures.nsSortDescriptors = [newSortDescriptor]
}
}
}
func getSettingForPhotoOrder() -> Setting? {
let fetchRequest: NSFetchRequest<Setting> = Setting.fetchRequest()
fetchRequest.predicate = NSPredicate(format: "name = %@", "photoSortOrder")
fetchRequest.fetchLimit = 1
do {
let results = try viewContext.fetch(fetchRequest)
return results.first
} catch {
print("Fetching Failed")
}
return nil
}
init(project: Project) {
self.project = project
_pictures = FetchRequest(
entity: Picture.entity(),
sortDescriptors: [
NSSortDescriptor(keyPath: \Picture.dateTaken, ascending: true)
],
predicate: NSPredicate(format: "project == %@", project)
)
}
}
