I am trying to implement a transition that makes my view move in from the side an disappear by getting smaller. Apple already provides some Transitions but how can I customize this transitions? P.S. I am using the .transition modifier.
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2 Answers
You can make a computed variable of the type AnyTransition as follows:
static var moveAndFade: AnyTransition {
let insertion = AnyTransition.move(edge: .trailing)
.combined(with: .opacity)
let removal = AnyTransition.scale
.combined(with: .opacity)
return .asymmetric(insertion: insertion, removal: removal)
}
You might wanna check out the tutorial series by Apple
Comments
I'd like to point out that there's a bug about the transition animations. You are supposed to be able to get what you want this way:
struct ContentView: View {
@State private var showView = false
private var slideAndScale: AnyTransition {
let insertion = AnyTransition.move(edge: .trailing)
let removal = AnyTransition.scale
return .asymmetric(insertion: insertion, removal: removal)
}
var body: some View {
ZStack {
Color.green
if showView {
Color.yellow
.transition(slideAndScale)
}
Button(action: {
withAnimation {
self.showView.toggle()
}
}) {
self.showView ? Text("HIDE VIEW") : Text("SHOW VIEW")
}
}
}
}
Where the Color.yellow is the view that navigates in and out with the custom animation. But if you copy-paste this code you'll find out that the removal animation (in this case the scale animation) won't work. And this is a bug of SwiftUI. To solve this issue there's a workaround:
struct ContentView: View {
@State private var showView = false
private var slideAndScale: AnyTransition {
let insertion = AnyTransition.move(edge: .trailing)
let removal = AnyTransition.scale
return .asymmetric(insertion: insertion, removal: removal)
}
var body: some View {
ZStack {
Color.green
VStack {
if showView {
Color.yellow
.transition(slideAndScale)
}
}
Button(action: {
withAnimation {
self.showView.toggle()
}
}) {
self.showView ? Text("HIDE VIEW") : Text("SHOW VIEW")
}
}
}
}
embed the if showView block in a VStack and the removal animation will behave as expected.
Comments
