Animating flower petals in an arc

We have a background, text labels, and an inhaling and exhaling breath effect; now let’s add the petals to the scene. We can add the petal code in a separate file, so press Command + N to bring up the New File window, and create a new SwiftUIView file called PetalView.

The goal here is to make five petals move in an arc, so they open and close. We only need two variables for this, so this will be a very small file: we need one Boolean (Bool) variable to track the animation, and another variable to hold the number of rotations we want for each petal. Let’s add them now:

    @Binding var petal: Bool
    var degrees: Double = 0.0

The Binding variable called petal will handle the animation. We are using the Binding wrapper because we are in a new struct, and we will need to use this variable in another struct, ContentView. When we prefix a variable with the Binding wrapper, we can then use...