Offline Data with Realm
Add to favorites
Save your SwiftUI data into a Realm so users can access them offline
SwiftUI Advanced Handbook
1
Firebase Auth
8:18
2
Read from Firestore
8:01
3
Write to Firestore
5:35
4
Join an Array of Strings
3:33
5
Data from JSON
5:08
6
HTTP Request
6:31
7
WKWebView
5:25
8
Code Highlighting in a WebView
5:11
9
Test for Production in the Simulator
1:43
10
Debug Performance in a WebView
1:57
11
Debug a Crash Log
2:22
12
Simulate a Bad Network
2:11
13
Archive a Build in Xcode
1:28
14
Apollo GraphQL Part I
6:21
15
Apollo GraphQL Part 2
6:43
16
Apollo GraphQL Part 3
5:08
17
Configuration Files in Xcode
4:35
18
App Review
5:43
19
ImagePicker
5:06
20
Compress a UIImage
3:32
21
Firebase Storage
11:11
22
Search Feature
9:13
23
Push Notifications Part 1
5:59
24
Push Notifications Part 2
6:30
25
Push Notifications Part 3
6:13
26
Network Connection
6:49
27
Download Files Locally Part 1
6:05
28
Download Files Locally Part 2
6:02
29
Offline Data with Realm
10:20
30
HTTP Request with Async Await
6:11
31
Xcode Cloud
9:23
32
SceneStorage and TabView
3:52
33
Network Connection Observer
4:37
34
Apollo GraphQL Caching
9:42
35
Create a model from an API response
5:37
36
Multiple type variables in Swift
4:23
37
Parsing Data with SwiftyJSON
9:36
38
ShazamKit
12:38
39
Firebase Remote Config
9:05
Installation
Install Realm through Swift Package Manager. Learn how to install it with SPM in the Swift Package Manager section of the SwiftUI Handbook. In the search box, paste the following link to Realm's Github repository in order to fetch the package.
https://github.com/realm/realm-cocoa.gitWhen asked for the packages you want to install into your project, check the two of them.
Create a RealmManager class
Once the package is installed, create a class called RealmManager, where you will manage everything related to Realm. It'll conform to an ObservableObject. Don't forget to import RealmSwift at the top.
// RealmManager.swift
import Foundation
import RealmSwift
class RealmManager: ObservableObject {
}Open a Realm
Create a variable, called localRealm, in which you'll save your Realm.
// RealmManager.swift
private(set) var localRealm: Realm?To open a Realm, use the following code. Before creating our local Realm, we are setting its configuration. Remember to increment the schemaVersion any time you update your Realm schema. Then, we're opening a Realm and it will be saved into the localRealm variable we just created.
// RealmManager.swift
func openRealm() {
do {
let config = Realm.Configuration(schemaVersion: 1, migrationBlock: { migration, oldSchemaVersion in
if oldSchemaVersion > 1 {
// Do something, usually updating the schema's variables here
}
})
Realm.Configuration.defaultConfiguration = config
localRealm = try Realm()
} catch {
print("Error opening Realm", error)
}
}Call the openRealm function on initialize of your RealmManager class.
// RealmManager.swift
init() {
openRealm()
}Create your Realm object
In order to save data in a Realm, we need to create a Realm object (a Realm model). Note that this Realm object should be at the top-level of your app, so it should be outside of the RealmManager class.
Let's create a new file called Course.swift and save our Course object there. Each Course object will contain a title, an optional subtitle and a numberOfSections.
// Course.swift
import Foundation
import RealmSwift
class Course: Object {
@objc dynamic var id = 1
@objc dynamic var title = ""
@objc dynamic var subtitle: String?
@objc dynamic var numberOfSections = 10
}Write to Realm
To create a new course and add it to your Realm, use the function below. We are creating a course within the function and will try to write it into the localRealm we opened.
// RealmManager.swift
func addCourse() {
if let localRealm = localRealm {
do {
try localRealm.write {
let newCourse = Course()
newCourse.id = Int.random(in: 0...100)
newCourse.title = "Advanced Development in SwiftUI"
newCourse.subtitle = "Advance your SwiftUI skills by developing an app using Core Data, CloudKit, In App Purchases, Sign In With Apple, and Firebase Authentication"
newCourse.numberOfSections = 20
localRealm.add(newCourse)
print("Added new course to Realm!")
}
} catch {
print("Error adding course to Realm", error)
}
}
}And let's call the addCourse function on initialize of the RealmManager.
// RealmManager.swift
init() {
openRealm()
addCourse()
}Read from Realm
Create a local variable where we'll save the courses.
// RealmManager.swift
@Published var courses: [Course] = []Create the getCourses function to get all the courses saved in Realm.
// RealmManager.swift
func getCourses() {
if let localRealm = localRealm {
let allCourses = localRealm.objects(Course.self)
allCourses.forEach { course in
courses.append(course)
}
}
}We can call this function on initialize of the RealmManager class.
// RealmManager.swift
init() {
openRealm()
addCourse()
getCourses()
}Delete from Realm
// RealmManager.swift
func deleteCourse(id: Int) {
if let localRealm = localRealm {
let allCourses = localRealm.objects(Course.self)
let course = allCourses.filter("id == \(id)")
guard !course.isEmpty else { return }
do {
try localRealm.write {
localRealm.delete(course)
courses = []
getCourses()
print("Course deleted from Realm")
}
} catch {
print("Error deleting course", error)
}
}
}Connect to View
Now that we have all the functions in our RealmManager, let's initialize our it in our ContentView, at the top of our file.
// ContentView.swift
@StateObject var realmManager = RealmManager()Let's iterate through the courses and, for each course, display a row with the course title and a trash can image so that we can delete the course.
// ContentView.swift
VStack(spacing: 10) {
ForEach(realmManager.courses, id: \.id) { course in
HStack {
Text(course.title)
Spacer()
Image(systemName: "trash")
}
.padding(.horizontal, 20)
}
}On the image, we'll add an onTapGesture and call the deleteCourse function from our RealmManager.
// ContentView.swift
Image(systemName: "trash")
.onTapGesture {
realmManager.deleteCourse(id: course.id)
}Learn with videos and source files. Available to Pro subscribers only.
Purchase includes access to 50+ courses, 320+ premium tutorials, 300+ hours of videos, source files and certificates.
Templates and source code
Download source files
Download the videos and assets to refer and learn offline without interuption.
Design template
Source code for all sections
Video files, ePub and subtitles
Videos
Assets
ePub
Subtitles
1
Firebase Auth
How to install Firebase authentification to your Xcode project
8:18
2
Read from Firestore
Install Cloud Firestore in your application to fetch and read data from a collection
8:01
3
Write to Firestore
Save the data users input in your application in a Firestore collection
5:35
4
Join an Array of Strings
Turn your array into a serialized String
3:33
5
Data from JSON
Load data from a JSON file into your SwiftUI application
5:08
6
HTTP Request
Create an HTTP Get Request to fetch data from an API
6:31
7
WKWebView
Integrate an HTML page into your SwiftUI application using WKWebView and by converting Markdown into HTML
5:25
8
Code Highlighting in a WebView
Use Highlight.js to convert your code blocks into beautiful highlighted code in a WebView
5:11
9
Test for Production in the Simulator
Build your app on Release scheme to test for production
1:43
10
Debug Performance in a WebView
Enable Safari's WebInspector to debug the performance of a WebView in your application
1:57
11
Debug a Crash Log
Learn how to debug a crash log from App Store Connect in Xcode
2:22
12
Simulate a Bad Network
Test your SwiftUI application by simulating a bad network connection with Network Link Conditionner
2:11
13
Archive a Build in Xcode
Archive a build for beta testing or to release in the App Store
1:28
14
Apollo GraphQL Part I
Install Apollo GraphQL in your project to fetch data from an API
6:21
15
Apollo GraphQL Part 2
Make a network call to fetch your data and process it into your own data type
6:43
16
Apollo GraphQL Part 3
Display the data fetched with Apollo GraphQL in your View
5:08
17
Configuration Files in Xcode
Create configuration files and add variables depending on the environment - development or production
4:35
18
App Review
Request an app review from your user for the AppStore
5:43
19
ImagePicker
Create an ImagePicker to choose a photo from the library or take a photo from the camera
5:06
20
Compress a UIImage
Compress a UIImage by converting it to JPEG, reducing its size and quality
3:32
21
Firebase Storage
Upload, delete and list files in Firebase Storage
11:11
22
Search Feature
Implement a search feature to filter through your content in your SwiftUI application
9:13
23
Push Notifications Part 1
Set up Firebase Cloud Messaging as a provider server to send push notifications to your users
5:59
24
Push Notifications Part 2
Create an AppDelegate to ask permission to send push notifications using Apple Push Notifications service and Firebase Cloud Messaging
6:30
25
Push Notifications Part 3
Tie everything together and test your push notifications feature in production
6:13
26
Network Connection
Verify the network connection of your user to perform tasks depending on their network's reachability
6:49
27
Download Files Locally Part 1
Download videos and files locally so users can watch them offline
6:05
28
Download Files Locally Part 2
Learn how to use the DownloadManager class in your views for offline video viewing
6:02
29
Offline Data with Realm
Save your SwiftUI data into a Realm so users can access them offline
10:20
30
HTTP Request with Async Await
Create an HTTP get request function using async await
6:11
31
Xcode Cloud
Automate workflows with Xcode Cloud
9:23
32
SceneStorage and TabView
Use @SceneStorage with TabView for better user experience on iPad
3:52
33
Network Connection Observer
Observe the network connection state using NWPathMonitor
4:37
34
Apollo GraphQL Caching
Cache data for offline availability with Apollo GraphQL
9:42
35
Create a model from an API response
Learn how to create a SwiftUI model out of the response body of an API
5:37
36
Multiple type variables in Swift
Make your models conform to the same protocol to create multiple type variables
4:23
37
Parsing Data with SwiftyJSON
Make API calls and easily parse data with this JSON package
9:36
38
ShazamKit
Build a simple Shazam clone and perform music recognition
12:38
39
Firebase Remote Config
Deliver changes to your app on the fly remotely
9:05
Meet the instructor
We all try to be consistent with our way of teaching step-by-step, providing source files and prioritizing design in our courses.
Stephanie Diep
iOS and Web developer
Developing web and mobile applications while learning new techniques everyday
7 courses - 36 hours
Build Quick Apps with SwiftUI
Apply your Swift and SwiftUI knowledge by building real, quick and various applications from scratch
11 hrs
Advanced React Hooks Handbook
An extensive series of tutorials covering advanced topics related to React hooks, with a main focus on backend and logic to take your React skills to the next level
3 hrs
SwiftUI Concurrency
Concurrency, swipe actions, search feature, AttributedStrings and accessibility were concepts discussed at WWDC21. This course explores all these topics, in addition to data hosting in Contentful and data fetching using Apollo GraphQL
3 hrs
SwiftUI Combine and Data
Learn about Combine, the MVVM architecture, data, notifications and performance hands-on by creating a beautiful SwiftUI application
3 hrs
SwiftUI Advanced Handbook
An extensive series of tutorials covering advanced topics related to SwiftUI, with a main focus on backend and logic to take your SwiftUI skills to the next level
4 hrs
React Hooks Handbook
An exhaustive catalog of React tutorials covering hooks, styling and some more advanced topics
5 hrs
SwiftUI Handbook
A comprehensive series of tutorials covering Xcode, SwiftUI and all the layout and development techniques
7 hrs
