Previews in Xcode Xcodeでプレビューする

Generate dynamic, interactive previews of your custom views. あなたのあつらえのビューの動的な、相互作用するプレビューを生成します。

Overview 概要

When you create a custom View with SwiftUI, Xcode can display a preview of the view’s content that stays up to date as you make changes to the view’s code. You define a structure that conforms to the PreviewProvider protocol to tell Xcode what to display. Xcode shows the preview in a canvas beside your code.

A screenshot of Xcode showing code that draws a circular image and the

You can use view modifiers to configure the preview, including a set of preview-specific modifiers, like previewDevice(_:) and previewInterfaceOrientation(_:). Xcode also reflects changes that you make in the canvas back into your code. For tips on working with the canvas, see the Creating and Combining Views tutorial.

Topics 話題

Preview Creation プレビュー作成

protocol PreviewProvider
A type that produces view previews in Xcode. ある型、それはビュープレビューをXcodeにおいて生み出すものです。
enum PreviewPlatform
Platforms that can run the preview.

Preview Customization プレビューカスタマイゼーション

func previewDisplayName(String?) -> some View
Sets a user visible name to show in the canvas for a preview.
func previewDevice(PreviewDevice?) -> some View
Overrides the device for a preview. プレビューに対するデバイスをオーバーライドします。
struct PreviewDevice
A simulator device that runs a preview.
func previewLayout(PreviewLayout) -> some View
Overrides the size of the container for the preview. プレビューに対するコンテナの大きさをオーバーライドします。
enum PreviewLayout
A size constraint for a preview.
func previewInterfaceOrientation(InterfaceOrientation) -> some View
Overrides the orientation of the preview.
struct InterfaceOrientation
The orientation of the interface from the user’s perspective.

Preview Contexts

func previewContext<C>(C) -> some View
Declares a context for the preview. プレビューに対する前後関係を宣言します。
protocol PreviewContext
A context type for use with a preview.
protocol PreviewContextKey
A key type for a preview context.

See Also 参照

Tool Support

Xcode Library Customization
Expose custom views and modifiers in the Xcode library.