Network Connection
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Verify the network connection of your user to perform tasks depending on their network's reachability
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
Imports
Let's create a new file called NetworkReachability.swift and import Foundation and SystemConfiguration at the top of our file.
// NetworkReachability.swift
import Foundation
import SystemConfigurationCreate the NetworkReachability class
Next, create your NetworkReachability class. It'll conform to an ObservableObject, so that the changes will automatically be accessible to your entire application.
// NetworkReachability.swift
class NetworkReachability: ObservableObject {
}Add variables
At the top of your class, add two new variables. The first one is a @Published variable, called reachable, that will be true if the network is reachable. Initially, it'll be false. We're also adding the private(set) so that we can only modify this variable inside of the NetworkReachability class.
// NetworkReachability.swift
@Published private(set) var reachable: Bool = falseThe second variable is a private variable called reachability. It's a SCNetworkReachabilityCreateWithName, which takes a hostname and it creates a reachability reference. We'll need it later when we'll check the Internet connection.
// NetworkReachability.swift
private let reachability = SCNetworkReachabilityCreateWithName(nil, "www.designcode.io")Create the isNetworkReachable function
Create your first function and call it isNetworkReachable. It'll take flags, which are of type SCNetworkReachabilityFlags, as an argument, and return a boolean that will tell us if the network is reachable.
// NetworkReachability.swift
private func isNetworkReachable(with flags: SCNetworkReachabilityFlags) -> Bool {
}The flags passed as an argument inside of the function can contain different constants. If you go on the SCNetworkReachabilityFlags documentation page, you'll see the list of possible constants that the flags can contain.
So, inside of the isNetworkReachable function, let's check if the flags contain some constants that are useful to us in order to check the Internet connection. On the last line inside of this function, we'll return the Boolean that will tell us if the network is reachable. The network is considered reachable if isReachable is true, no connection is required and the device can connect without intervention to the network.
// NetworkReachability.swift
private func isNetworkReachable(with flags: SCNetworkReachabilityFlags) -> Bool {
let isReachable = flags.contains(.reachable)
let connectionRequired = flags.contains(.connectionRequired)
let canConnectAutomatically = flags.contains(.connectionOnDemand) || flags.contains(.connectionOnTraffic)
let canConnectWithoutIntervention = canConnectAutomatically && !flags.contains(.interventionRequired)
return isReachable && (!connectionRequired || canConnectWithoutIntervention)
}Create the checkConnection function
Next, let's create the checkConnection function that will return us the connection status, as a Boolean.
// NetworkReachability.swift
func checkConnection() -> Bool {
}Inside of this function, we are creating a SCNetworkReachabilityFlags variable called flags, and then passing them to SCNetworkReachabilityGetFlags. This takes the reachability variable we created at the beginning as well as the flags variable. Finally, we're checking if the network is reachable with the isNetworkReachable function. If it's reachable, we're returning true. If not, we're returning false.
// NetworkReachability.swift
func checkConnection() -> Bool {
var flags = SCNetworkReachabilityFlags()
SCNetworkReachabilityGetFlags(reachability!, &flags)
return isNetworkReachable(with: flags)
}Call checkConnection on initialize
On init of the class, we'll call the checkConnection function, and save the result in the reachable variable at the top of the class.
// NetworkReachability.swift
init() {
self.reachable = checkConnection()
}Use the class
To use the NetworkReachability class, initialize it wherever you want and simply use the networkReachability.reachable Boolean to perform any action you want when Internet is available, or not!
Below, we're displaying the value of networkReachability.reachable in ContentView.
// ContentView.swift
struct ContentView: View {
let networkReachability = NetworkReachability()
var body: some View {
Text("Is the network reachable? \(networkReachability.reachable)" as String)
.padding()
}
}Final code
Below is the final code for the NetworkReachability class.
// NetworkReachability.swift
import Foundation
import SystemConfiguration
class NetworkReachability: ObservableObject {
@Published private(set) var reachable: Bool = false
private let reachability = SCNetworkReachabilityCreateWithName(nil, "www.designcode.io")
init() {
self.reachable = checkConnection()
}
private func isNetworkReachable(with flags: SCNetworkReachabilityFlags) -> Bool {
let isReachable = flags.contains(.reachable)
let connectionRequired = flags.contains(.connectionRequired)
let canConnectAutomatically = flags.contains(.connectionOnDemand) || flags.contains(.connectionOnTraffic)
let canConnectWithoutIntervention = canConnectAutomatically && !flags.contains(.interventionRequired)
return isReachable && (!connectionRequired || canConnectWithoutIntervention)
}
func checkConnection() -> Bool {
var flags = SCNetworkReachabilityFlags()
SCNetworkReachabilityGetFlags(reachability!, &flags)
return isNetworkReachable(with: flags)
}
}Learn with videos and source files. Available to Pro subscribers only.
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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
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