插入与移除过渡
为视图的出现和消失添加动画。
插入与移除过渡 是 CoddyKit 上的免费 SwiftUI Academy 课时。 这是第 3 节课，共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 SwiftUI Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 SwiftUI Academy 课程共包含 4 节课。
本课时的部分内容尚未翻译，以英文显示。
Views Coming and Going
When a view is added or removed, a transition describes how it animates in and out instead of just popping.
Transitions Need Animation
A transition only plays when the insertion or removal happens inside an animation, like a withAnimation toggle of a boolean.
The .transition Modifier
You attach .transition to the view that appears or disappears, choosing the style of its entrance and exit.
if show {
Banner().transition(.opacity)
}Fade with .opacity
The simplest transition is .opacity, which fades a view in when added and out when removed.
Slide In and Out
The .slide transition moves a view in from one edge and out the other, great for banners and rows.
.transition(.slide)Scale to Grow
The .scale transition grows a view from small to full size on insert and shrinks it on removal.
.transition(.scale)Move from an Edge
Use .move(edge:) to push a view in from a specific side, such as the bottom for a toast message.
.transition(.move(edge: .bottom))Combine Transitions
Chain effects with .combined(with:) so a view can fade while it slides, giving richer motion.
.transition(.opacity.combined(with: .slide))Asymmetric Transitions
With .asymmetric you set different insertion and removal effects, like scale in but fade out.
.transition(.asymmetric(
insertion: .scale,
removal: .opacity))Trigger the Change
Wrap the boolean toggle in withAnimation so the conditional view runs its transition rather than appearing instantly.
withAnimation {
show.toggle()
}Transitions and Identity
SwiftUI plays a transition based on view identity: a view truly entering or leaving the hierarchy, not just changing values.
Quick Check
What is required for a transition to actually play?
Recap: Transitions
You learned that .transition styles how views enter and leave, from fades to slides to asymmetric combos, all triggered by animated changes. 🎬
常见问题解答
「插入与移除过渡」课时是免费的吗？
是的 — 「插入与移除过渡」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 SwiftUI Academy 课程的其余内容，请升级到 CoddyKit PRO。 SwiftUI Academy 课程共包含 4 节课。
「插入与移除过渡」这节课中我会学到什么？
为视图的出现和消失添加动画。 你通过在浏览器中直接运行的动手代码来练习 SwiftUI Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。
学习 SwiftUI Academy 需要有经验吗？
无需任何先前经验。CoddyKit 上的 SwiftUI Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。 这是第 3 节课，共 4 节。
「插入与移除过渡」课时需要多长时间？
大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。
我能在这节 SwiftUI Academy 课中编写并运行代码吗？
能。每节 SwiftUI Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。