SwiftUI Academy · 课时

使用 ZStack 分层

将视图从后到前重叠排列，营造层次感。

使用 ZStack 分层 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。

Stacking in Depth

VStack goes down and HStack goes across, but sometimes you want views to overlap. That calls for a stack that works in depth. 🧱

Meet ZStack

A ZStack layers its children back to front, like sheets of glass piled on top of each other. Later views sit above earlier ones.

Your First ZStack

Inside a ZStack, the first child is the back layer and the last child is the front. Here the text sits on top of the colored background.

ZStack {
    Color.blue
    Text("On top")
}

Back to Front Order

The drawing rule is simple: earlier children are behind, later children are in front. The last view you write wins the top spot.

Backgrounds Made Easy

A ZStack is a natural way to put a color or image behind your content. Drop a Color first, then layer your views on top of it.

Centered Overlap

By default a ZStack centers every child over the same point, so layers share one middle. You change this with an alignment argument.

ZStack(alignment: .topLeading) {
    Color.gray
    Text("Corner")
}

Badges on Icons

A common ZStack pattern is a badge floating over an icon, like an unread count perched on the corner of a bell.

Sizing the ZStack

A ZStack takes the size of its largest child. A tiny label over a big image gives the stack the image's full footprint.

Cards with Overlays

Layer a gradient and a title over a photo to make a card. ZStack lets text stay readable on top of any background image.

ZStack {
    Image("cover")
    Text("Caption")
}

ZStack Is a View

Like the other stacks, a ZStack is one view, so padding, frame, or background modifiers apply to the whole layered group together.

When to Reach for ZStack

Use a ZStack whenever views must overlap: a background behind content, a watermark, a badge, or text floating over an image.

Quick Check

Let's test your grasp of ZStack layering.

Recap: Layering Views

Awesome! A ZStack layers children back to front, centers them by default, and is your tool for backgrounds, badges, and overlapping cards. ✨

常见问题解答

「使用 ZStack 分层」课时是免费的吗？

是的 — 「使用 ZStack 分层」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。

「使用 ZStack 分层」这节课中我会学到什么？

将视图从后到前重叠排列，营造层次感。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。

「使用 ZStack 分层」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。

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