Why isn't this simple opacity animation working in SwiftUI?

Question

I was trying to make a simple fade in fade out animation for a text but when I try to do it this way it doesn't work. Theres no smooth increase and decrease in opacity it just jumps to full and no opacity.

struct Test: View {
    @State var showing = false
    
    var body: some View {
        VStack {
            Button("Toggle") {
                self.showing.toggle()
            }
            
            if showing {
                Text("Hello")
                    .transition(.opacity)
                    .animation(.easeInOut)
            }
        }
    }
}

Does anyone know why this doesn't work as intended? I was expecting this to have a smooth fade in fade out transition when the Text was inserted and removed from the View Hierarchy.

Asperi · Accepted Answer · 2020-07-31 07:47:21Z

4

There is no-one left to animate when showing is false. Instead use the following:

VStack {
    if showing {
        Text("Hello")
            .transition(.opacity)
    }
}.animation(.easeInOut)   // << here !!

answered Jul 31, 2020 at 7:47

Asperi

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1 Comment

LetsGoBrandon Over a year ago

I don't understand why it works like that?

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