This is a 15-minute SwiftUI live coding exercise. Tapping an "Add" button should show a quantity stepper (minus/plus) in the same spot, and when the quantity hits 0 the stepper should disappear and the "Add" button should come back. How do you set up the state and structure the views?
One piece of state, the count, is enough: draw the Add button when count == 0 and the stepper otherwise. With no separate Bool flag, put the two views in a ZStack or a fixed frame so they occupy the same spot.
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