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模型容器与上下文

使用 modelContainer 设置存储。

第 2 / 4 课13 个步骤

模型容器与上下文 是 CoddyKit 上的免费 SwiftUI Academy 课时。这是第 2 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 Container Is

The model container is the engine that sets up your storage on disk. Your whole app shares one container for all its SwiftData models.

Adding the Container

Attach a container to your app with the modelContainer modifier on a scene. One line gives every view access to your saved data.

WindowGroup {
    ContentView()
}
.modelContainer(for: Task.self)

Listing Multiple Models

Pass an array to register several models at once. The container then knows about every type your app needs to save.

.modelContainer(for: [Task.self, Project.self])

What a Context Is

The model context is your working space for changes. You insert, edit, and delete through it, then it saves to the container.

Reading the Context

Grab the active context inside a view with the @Environment property wrapper. SwiftData injects it for you automatically.

@Environment(\.modelContext) private var context

Inserting an Object

Call insert on the context to start tracking a new object. From this point SwiftData watches it for saving.

context.insert(Task(title: "Buy milk"))

Automatic Saving

SwiftData usually autosaves changes for you at smart moments. You rarely need to save by hand in a simple app.

Saving Manually

When you need certainty, call save on the context to write changes right now. It is handy before a critical step.

try context.save()

In-Memory Containers

Set isStoredInMemoryOnly to true for a throwaway store. It is perfect for previews and tests that should not touch the disk.

let config = ModelConfiguration(
    isStoredInMemoryOnly: true)

Custom Configuration

A ModelConfiguration lets you tune where and how data is stored. You pass it when building a container by hand.

let container = try ModelContainer(
    for: Task.self, configurations: config)

One Container, Many Views

Because the container lives at the app level, every view shares the same data. Edits in one screen show up everywhere instantly.

Quick Check

Quick check on container and context.

在交互式课程中回答

Recap: Container & Context

You set up storage with modelContainer, then insert and save through the context from @Environment. Your app can now read and write data. ✅

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常见问题解答

「模型容器与上下文」课时是免费的吗？

是的 — 「模型容器与上下文」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。

「模型容器与上下文」这节课中我会学到什么？

使用 modelContainer 设置存储。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 2 节课，共 4 节。

「模型容器与上下文」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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