🔰implicit vs. explicit

⭐️ 重點

• implicit: use view.animation(), SwiftUI will automatically render the animation based on the state changes of the view.

• explicit: tell SwiftUI what state changes you want to animate inside the withAnimation() block.

An implicit animation is part of the view tree: by adding .animation() to a view, any change to that view is automatically animated.

we create an animatable view by calling .animation() on a view. When we create an implicit animation, anytime the view tree is recomputed, changes of animatable properties in this view tree are animated.

💈範例

• Spinner

📗 參考

• Thinking in SwiftUI, Ch. 6: Animations (p.113)

📘 手冊

• SwiftUI ⟩

  • Drawing and Animation ⟩

    • Animation (struct)

    • Animatable (protocol) - describes how to animate a property of a view

    • withAnimation(::)

  • View ⟩ Graphics and Rendering ⟩

    • .animation(_:) - applied to equatable view

    • .animation(_:value:) - applied to equatable value (non-equatable view)