SwiftUI: How to add transitions between conditional views?

Question

In my app I have such view:

import SwiftUI

let defaults = UserDefaults.standard

struct ContentView: View {
    @State var haveSeenIntroduction: Bool = defaults.bool(forKey: "haveSeenIntroduction")

    var body: some View {
        ZStack {
            if self.haveSeenIntroduction {
                DefaultView()
            } else {
                IntroductionView(haveSeenIntroduction: $haveSeenIntroduction)
            }
        }.transition(.scale)
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

In "IntroductionView" I have such button:

Button(action: {
    let generator = UINotificationFeedbackGenerator()
    generator.notificationOccurred(.success)

    let defaults = UserDefaults.standard

    defaults.set(true, forKey: "haveSeenIntroduction")

    withAnimation {
        self.haveSeenIntroduction = true
    }
})

When I press the button, when using ZStack in the parent view, transition looks buggy (previous view "jumps up" and it looks horrible), when using Group transition does not happen at all. How can I fix this behaviour and implement transition between these two views without lags, jumps, etc?

Mac3n · Accepted Answer · 2020-02-10 07:13:46Z

2

You should set .transition(.scale) on your views, not the stack to show the transition

answered Feb 10, 2020 at 7:13

Mac3n

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1 Comment

Andrey Viktorov Over a year ago

I've tried it before, but with Group instead, and looks like the correct solution was to use ZStack and a transition on views itself, thanks!

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