Is it possible to change image with fade animation using same Image? (SwiftUI)

Question

According to my logic, on tap gesture to the image it should be changed with fade animation, but actual result is that image changes without animation. Tested with Xcode 11.3.1, Simulator 13.2.2/13.3 if it is important.

P.S. Images are named as "img1", "img2", "img3", etc.

enum ImageEnum: String {
    case img1
    case img2
    case img3

    func next() -> ImageEnum {
        switch self {
            case .img1: return .img2
            case .img2: return .img3
            case .img3: return .img1
        }
    }
}

struct ContentView: View {
    @State private var img = ImageEnum.img1
    var body: some View {
        Image(img.rawValue)
            .onTapGesture {
                withAnimation {
                    self.img = self.img.next()
                }
            }
    }
}

Answer 1

I haven't tested this code, but something like this might be a bit simpler:

struct ContentView: View {
    @State private var img = ImageEnum.img1
    var body: some View {
        Image(img.rawValue)
            .id(img.rawValue)
            .transition(.opacity.animation(.default))
            .onTapGesture {
                withAnimation {
                    self.img = self.img.next()
                }
            }
    }
}

The idea is tell SwiftUI to redraw the Image whenever the filename of the asset changes by binding the View's identity to the filename itself. When the filename changes, SwiftUI assumes the View changed and a new View must be added to the view hierarchy, thus the transition is triggered.

Answer 2

You should first inflate your binding object.

See this guide for help

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    MyLayoutBinding binding = MyLayoutBinding.inflate(getLayoutInflater());

    setContentView(binding.root);
}