Parse-Swift example for SwiftUI App life cycle

cappern · January 29, 2021, 8:26am

Hi, beeing a total noob in swift programming I find it hard to implement Parse-swift with the “new” SwiftUI app life cycle.
Does anyone care to share any examples to get my project started?

-Cappern

alexvenom · January 29, 2021, 7:15pm

Hey @cappern!
I just created an Github project with Parse in SwiftUI. Very simple stuff: only configures Parse and in the ContentView it makes a simple query printing stuff on the onAppear event.
Hope it helps you.
Here is the link for it:

cbaker6 · January 30, 2021, 7:27am

If you are referring to the recently released Parse-Swift SDK. This project uses it

To see how you would implement a login screen in SwiftUI you can look at these files:

github.com

netreconlab/CareKitSample-ParseCareKit/blob/main/OCKSample/Login/LoginView.swift

//
//  LoginView.swift
//  OCKSample
//
//  Created by Corey Baker on 10/29/20.
//  Copyright © 2020 Apple. All rights reserved.
//

// This is a variation of the tutorial found here: https://www.iosapptemplates.com/blog/swiftui/login-screen-swiftui

import SwiftUI
import ParseSwift
import UIKit

struct LoginView: View {
    
    //Anything is @ is a wrapper that subscribes and refreshes the view when a change occurs. List to the last lecture in Section 2 for an explanation
    @ObservedObject private var login = Login()
    @State private var usersname = ""
    @State private var password = ""

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github.com

netreconlab/CareKitSample-ParseCareKit/blob/main/OCKSample/Login/Login.swift

//
//  LoginViewModel.swift
//  OCKSample
//
//  Created by Corey Baker on 11/24/20.
//  Copyright © 2020 Apple. All rights reserved.
//

import Foundation
import ParseSwift
import CareKit
import CareKitStore

class Login: ObservableObject {

    private(set) var isLoggedIn = false {
        willSet {
            objectWillChange.send() //Publishes a notification to subscribers whenever this value changes
        }
    }

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Parse-Swift will receive some additional updates soon to make it easier to use with Parse-Swift. For now, you can look at the last file I posted to see how to add Parse-Swift to a view model

cbaker6 · January 31, 2021, 12:06am

There’s currently a pending PR on Parse-Swift that makes the SDK directly functional with SwiftUI, reducing the need to make custom view models for api calls to a Parse Server. The ParseLiveQuery part of Parse-Swift has it’s own view model (Subscription) that can already keep your SwiftUI views up-to-date. The PR is below:

cappern · January 31, 2021, 6:49pm

Thanks, I kinda found out on my own, but there sure was room for improvement
@cbaker6, keep up the good work!

cbaker6 · January 31, 2021, 8:18pm

Version 1.1.3 has publisher support:

Check the documentation for information about the Publishers (look for “Combine” or “Publisher”).

The previous versions still support SwiftUI, you would just use sync/async calls in your view model instead of using “…Publisher” like in my previous links.