Instance Property インスタンスプロパティ

isLuminanceReduced

A Boolean value that indicates whether the display currently requires reduced luminance.

Declaration 宣言 

var isLuminanceReduced: Bool { get set }

Discussion 議論

The system typically sets this value to true on watchOS when the user lowers their wrist, but the display remains on. When you detect this condition, lower the overall brightness of your view. For example, you can change large, filled shapes to be stroked, and choose less bright colors:


@Environment(\.isLuminanceReduced) var isLuminanceReduced


var body: some View {
    if isLuminanceReduced {
        Circle()
            .stroke(Color.gray, lineWidth: 10)
    } else {
        Circle()
            .fill(Color.white)
    }
}

In addition to the changes that you make, the system might also dim the display to achieve a suitable brightness. By reacting to isLuminanceReduced, you can preserve contrast and readability while helping to satisfy the reduced brightness requirement.

See Also 参照

State 状態

var editMode: Binding<EditMode>?
An indication of whether the user can edit the contents of a view associated with this environment.
var isEnabled: Bool
A Boolean value that indicates whether the view associated with this environment allows user interaction. あるブール値、それはこの環境と結びつけられたビューがユーザ相互作用を可能にするかどうかを指し示します。
var isFocused: Bool
Returns whether the nearest focusable ancestor has focus. 最も近いフォーカス可能な先祖がフォーカスを持つかどうかを返します。
var isPresented: Bool
A Boolean value that indicates whether the view associated with this environment is currently presented.
var isSearching: Bool
A Boolean value that indicates when the user is searching.
var scenePhase: ScenePhase
The current phase of the scene. そのシーンの現在の局面。