Gravity

Gravity is a SwiftUI library for remote data fetching. I acts as a Network Layer for your SwiftUI app, providing a simple and declarative way to fetch data from the server. It uses stale-while-revalidate technonology to fetch data from the server, a cache invalidation strategy popularized by HTTP RFC 5861 (opens in a new tab). Gravity first returns the data from cache (stale), then sends the fetch request (revalidate), and finally comes with the up-to-date data again.

Overview

import SwiftUI
import Gravity
 
struct LandmarkList: View {
    @RemoteObjects<LandmarkBase>(request: .all) var landmarks
    var body: some View {
        List(landmarks, id: \.id) { landmark in
            LandmarkRow(landmark: landmark)
        }
    }
}

In this example, the property wrapper @RemoteObjects accepts a request and returns an array of all the Landmark.

LandmarkBase acts as a controller for the Landmark model. It is responsible for fetching the data from the server and returning it to Gravity. The rest is handled by Gravity.