Rolling animatable view

AnimateableView.swift

struct AnimateableView<ContentView: View, Value: VectorArithmetic>: View {
    
    let value: Value
    @ViewBuilder let builder: (Value) -> ContentView
    
    var body: some View {
        builder(value)
            .modifier(Animation<ContentView, Value>(value: value, builder: builder))
    }
    
    private struct Animation<ContentView: View, Value: VectorArithmetic>: AnimatableModifier {
        
        var value: Value
        @ViewBuilder let builder: (Value) -> ContentView
        
        var animatableData: Value {
            get { value }
            set { value = newValue }
        }
        
        func body(content: Content) -> some View {
            builder(value)
        }
    }
}

extension AnimateableView {
    init(_ value: Value, @ViewBuilder builder: @escaping (Value) -> ContentView) {
        self.value = value
        self.builder = builder
    }
}

extension AnimateableView where Value: CustomStringConvertible, ContentView == Text {
    init(_ value: Value) {
        self.init(value: value) {
            Text($0.description)
        }
    }
}

Usage:

struct Demo: View {
        
        @State var test = 0.0
        
        var body: some View {
            VStack {
                AnimateableView(value: test) {
                    Text(String(Int($0)))
                }
                .animation(.easeIn, value: test)
                
                Button("Add 5") {
                    test += 5
                }
            }
        }
    }