SwiftUI Academy · 课时

创建可点击的按钮

创建带有标签和操作的 Button。

创建可点击的按钮 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。

Why Buttons Matter

Most apps come alive when you tap something. A Button is the simplest way to let people trigger an action in SwiftUI. 👆

The Button View

A Button is just a view, like Text or Image. You place it in your body and SwiftUI draws a tappable control for you.

Button("Tap me") {
    print("Tapped!")
}

Two Parts of a Button

Every button has two parts: a label that you see, and an action that runs when you tap it. Both are required.

The Simple Title Form

The quickest button takes a title string first and the action closure second. SwiftUI turns the string into a Text label for you.

Button("Save") {
    saveDocument()
}

The Action Closure

The braces hold the action closure. Whatever code you write inside runs once each time the button is tapped, and not before.

Button("Greet") {
    print("Hello there")
}

A Custom Label

Need more than text? Use the label form: pass an action, then a closure that returns any view you like for the look.

Button {
    likePost()
} label: {
    Image(systemName: "heart")
}

Labels Can Be Rich

Because the label is a view, you can combine an icon and text together inside a stack for a friendlier, clearer tappable area.

Button {
    addItem()
} label: {
    Label("Add", systemImage: "plus")
}

Buttons Live in the Body

A button goes inside your view's body, just like any other view. SwiftUI handles drawing it and listening for taps automatically.

var body: some View {
    Button("Continue") {
        goNext()
    }
}

The Tap Target

The whole label area is tappable, so a bigger label is easier to hit. Apple suggests a comfortable tap target of about 44 points.

Calling a Function on Tap

Keep the closure tidy by calling a function instead of cramming logic inline. The action just points to the work you defined elsewhere.

Button("Refresh") {
    reloadData()
}

No Tap, No Action

The action does not run when the screen loads. It waits patiently and only fires on tap, which keeps your view predictable.

Quick Check

Let's make sure the button basics clicked.

Recap

Nice work! A Button pairs a label you see with an action that runs on tap. Use the simple title form or a custom label view. ✨

常见问题解答

「创建可点击的按钮」课时是免费的吗？

是的 — 「创建可点击的按钮」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。

「创建可点击的按钮」这节课中我会学到什么？

创建带有标签和操作的 Button。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。

「创建可点击的按钮」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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