Descriptive example:
login screen, user taps "Login" button, request is performed, UI shows waiting indicator, then after successful response I'd like to automatically navigate user to the next screen.
How can I achieve such automatic transition in SwiftUI?
Allowing to push a new screen onto a navigation stack is as simple as wrapping your SwiftUI views into a NavigationLink wrapper. As long as you contain your views in a navigation view, you'll be able to push new destination views.
Open the Library by clicking on the + button in Xcode's top right corner. Search for UIHostingController and drag and drop it to the Storyboard. To create a Segue control-drag (hold down the ctrl key and drag the element) from the UIButton in the main ViewController to the UIHostingController we have just added.
You can replace the next view with your login view after a successful login. For example:
struct LoginView: View {
var body: some View {
...
}
}
struct NextView: View {
var body: some View {
...
}
}
// Your starting view
struct ContentView: View {
@EnvironmentObject var userAuth: UserAuth
var body: some View {
if !userAuth.isLoggedin {
LoginView()
} else {
NextView()
}
}
}
You should handle your login process in your data model and use bindings such as @EnvironmentObject
to pass isLoggedin
to your view.
Note: In Xcode Version 11.0 beta 4, to conform to protocol 'BindableObject' the willChange property has to be added
import Combine
class UserAuth: ObservableObject {
let didChange = PassthroughSubject<UserAuth,Never>()
// required to conform to protocol 'ObservableObject'
let willChange = PassthroughSubject<UserAuth,Never>()
func login() {
// login request... on success:
self.isLoggedin = true
}
var isLoggedin = false {
didSet {
didChange.send(self)
}
// willSet {
// willChange.send(self)
// }
}
}
For future reference, as a number of users have reported getting the error "Function declares an opaque return type", to implement the above code from @MoRezaFarahani requires the following syntax:
struct ContentView: View {
@EnvironmentObject var userAuth: UserAuth
var body: some View {
if !userAuth.isLoggedin {
return AnyView(LoginView())
} else {
return AnyView(NextView())
}
}
}
This is working with Xcode 11.4 and Swift 5
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