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EntityIterator: Wrapper around SwiftUI's ForEach to iterate through Core Data entities according to a predicate and sort descriptors you can change at runtime
//adapted via: https://www.hackingwithswift.com/books/ios-swiftui/dynamically-filtering-fetchrequest-with-swiftui
import SwiftUI
import CoreData
struct EntityIterator<Entity: NSManagedObject, Content: View>: View {
var fetchRequest: FetchRequest<Entity>
var results: FetchedResults<Entity> { fetchRequest.wrappedValue }
let content: (Entity) -> Content
var body: some View {
ForEach(fetchRequest.wrappedValue, id: \.self) { result in
self.content(result)
}
}
init(predicate: NSPredicate, sortDescriptors: [NSSortDescriptor], @ViewBuilder content: @escaping (Entity) -> Content) {
fetchRequest = FetchRequest<Entity>(entity: Entity.entity(), sortDescriptors: sortDescriptors, predicate: predicate)
self.content = content
}
}
@daniloc
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daniloc commented Aug 28, 2020

Example usage:

struct AView: View {
    @State var predicate = 
    @State var sortDescriptors = []

    var body: some View {

        List {
            EntityIterator(predicate: predicate, sortDescriptors: sortDescriptors) { (entity: EntityType) in
                Text(entity.name)
            }
        }

    }
}

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