Instance Subscript
subscript(_:)
Returns 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.
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
subscript<Key>(key: Key.Type) -> Key.Value where Key : PreviewContextKey { get }