let keyPath : KeyPath<Subject, Value> The key path, relative to the object receiving this message, of the property to publish.
let options: NSKeyValueObservingOptions Options that determine which elements the publisher produces.
Instance Property
インスタンスプロパティ
object
The object that contains the property to publish.
Availability
- iOS 7.0+
- iPadOS 7.0+
- macOS 10.9+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
- Xcode 11.0+
Technology
- Foundation ファウンデーション
Declaration 宣言
let object: Subject