SwiftUI Lecture 5. SwiftUI Access Control @ViewBuilder - What exactly is that argument to ZStack, ForEach, GeometryReader, etc? Shape - What if I wnat to draw my own View rather than construct it from other Views? Animation - Mobile app UIs look pretty bad without animation. Luckily in SwiftUI, animation (almost) comes for free! ViewModifier - What exactly are functions like foregroundColor, fon..