Return Value 戻り値
For ordinary sets, an element equal to new if the set already contained such a member; otherwise, nil. In some cases, the returned element may be distinguishable from new by identity comparison or some other means.
Instance Method
インスタンスメソッド
update(with:)
Inserts the given element into the set unconditionally.
Availability 有効性
- iOS 15.0+
- iPadOS 15.0+
- macOS 12.0+
- Mac Catalyst 15.0+
- tvOS 15.0+
- watchOS 8.0+
Technology
- Swift
UI
Declaration 宣言
mutating func update(with newMember: AccessibilityTechnologies ) -> AccessibilityTechnologies ?Parameters パラメータ
newMemberAn element to insert into the set.
Discussion 議論
If an element equal to new is already contained in the set, new replaces the existing element. In this example, an existing element is inserted into class, a set of days of the week.
enum DayOfTheWeek: Int {
case sunday, monday, tuesday, wednesday, thursday,
friday, saturday
}
var classDays: Set<DayOfTheWeek> = [.monday, .wednesday, .friday]
print(classDays.update(with: .monday))
// Prints "Optional(.monday)"