View Fundamentals

Create a hierarchy of configured views.

Overview 概要

Views are the building blocks that you use to declare your app’s user interface. Each contains a description of what to display for a given state. Every bit of your app that’s visible to the user derives from the description in a view, and any type that conforms to the View protocol can act as a view in your app.

Compose a custom view by combining built-in views that SwiftUI provides with other custom views that you create in your view’s body computed property. Configure views using the view modifiers that SwiftUI provides, or by defining your own view modifiers using the ViewModifier protocol and the modifier(_:) method.

Topics 話題

View Composition

Declaring a Custom View

Define views and assemble them into a view hierarchy.

protocol View

A type that represents part of your app’s user interface and provides modifiers that you use to configure views. ある型、それはあなたのアプリのもつユーザインターフェイスの一部を表します、そしてあなたがビューを構成設定するのに使う修飾子を提供します。

struct ViewBuilder

A custom parameter attribute that constructs views from closures. あるあつらえのパラメータ属性、それはビューをクロージャから組み立てるものです。

View Modifiers ビュー修飾子

Configuring Views ビューを構成設定する

Adjust the characteristics of a view by applying view modifiers.

Reducing View Modifier Maintenance

Bundle view modifiers that you regularly reuse into a custom view modifier.

protocol ViewModifier

A modifier that you apply to a view or another view modifier, producing a different version of the original value. ある修飾子、それはあなたがビューまたは別のビュー修飾子に適用するものです、元の値のある異なるバージョンを生成しています。

struct EmptyModifier

An empty, or identity, modifier, used during development to switch modifiers at compile time.

struct ModifiedContent

A value with a modifier applied to it. それに適用された修飾子をもつある値。

protocol EnvironmentalModifier

A modifier that must resolve to a concrete modifier in an environment before use. ある修飾子、それは具象修飾子へとある環境において使用前に解決しなければなりません。

Supporting View Types

struct AnyView

A type-erased view. ある型消去ビュー。

struct EmptyView

A view that doesn’t contain any content.

struct EquatableView

A view type that compares itself against its previous value and prevents its child updating if its new value is the same as its old value. あるビュー型、それはそれ自身をそれの前の値と比較して、それの新しい値がそれの古い値と同じならば、それの子を更新することを防ぎます。

struct SubscriptionView

A view that subscribes to a publisher with an action. あるビュー、それはあるパブリッシャーをアクションで購買します。

struct TupleView

A View created from a swift tuple of View values. View値それらからなるあるswiftタプルから作成されるあるView。

Deprecated View Types

Deprecated Views and Controls

Review unsupported views and their replacements.