subscript<Key>(Key.Type) -> Key.ValueReturns the context’s value for a key, or a the key’s default value if the context doesn’t define a value for the key.
ProtocolPreview
PreviewContext
A context type for use with a preview.
Availability 有効性
- iOS 14.0+
- iPadOS 14.0+
- macOS 11.0+
- Mac Catalyst 14.0+
- tvOS 14.0+
- watchOS 7.0+
Technology
- Swift
UI
Declaration 宣言
protocol PreviewContextTopics 話題
Accessing a Preview Context
See Also 参照
Preview Contexts
func previewContext <C>(C) -> some ViewDeclares 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 PreviewContextKey A key type for a preview context.