SwiftUI Academy · 课时

构建标签栏

使用带标签的 TabView 对界面进行分组。

构建标签栏 是 CoddyKit 上的免费 SwiftUI Academy 课时。这是第 1 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。

What a Tab Bar Does

A tab bar sits at the bottom of your app and lets people jump between a few top-level screens with one tap. 📱

Meet TabView

In SwiftUI you build that bar with TabView. It holds several screens and shows only one at a time.

TabView {
    HomeScreen()
    SettingsScreen()
}

Each Child Is a Tab

Every view placed directly inside TabView becomes one tab. Two child views means two tabs in the bar.

Labeling a Tab

Without a label a tab shows nothing useful. The tabItem modifier gives each tab its icon and text.

HomeScreen()
    .tabItem {
        Label("Home", systemImage: "house")
    }

Using Label Inside tabItem

Inside tabItem you usually put a Label, which pairs a title with an SF Symbol for a clean, native look.

A Two-Tab Example

Here a full TabView shows a Home tab and a Settings tab, each with its own icon and screen.

TabView {
    HomeScreen()
        .tabItem { Label("Home", systemImage: "house") }
    SettingsScreen()
        .tabItem { Label("Settings", systemImage: "gear") }
}

One Screen at a Time

TabView keeps every tab alive but only shows the selected one. Tapping another tab swaps the visible screen instantly.

Where to Place TabView

Make TabView the root view of your app so the bar stays visible no matter which tab is active.

Keep Tabs Few

iOS shows up to five tabs comfortably. Aim for three to five clear sections so users never feel lost. ✨

Tabs Are Independent

Each tab manages its own content. Scrolling or editing in one tab does not reset the others when you switch.

Native Feel for Free

Because TabView is built in, you get the standard look, blur, and animations users already expect from iOS.

Quick Check

Let us check how you give a tab its icon and title.

Recap: Building a Tab Bar

A TabView turns each child view into a tab, and tabItem gives every tab its label so users move between screens with one tap. 🎉

常见问题解答

「构建标签栏」课时是免费的吗？

是的 — 「构建标签栏」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。

「构建标签栏」这节课中我会学到什么？

使用带标签的 TabView 对界面进行分组。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 1 节课，共 4 节。

「构建标签栏」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。

此课程中的所有课时

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