swiftUI 环境值

 @Environment(.horizontalSizeClass) private var horizontalSizeClass: UserInterfaceSizeClass?

    @Environment(.dynamicTypeSize) private var dynamicTypeSize: DynamicTypeSize

    @Environment(.symbolVariants) private var symbolVariant: SymbolVariants

@Environment(.symbolRenderingMode) private var symbolRenderingMode: SymbolRenderingMode?

@Environment(.dismissSearch) var dismissSearch

@Environment(.isSearching) var isSearching

@Environment(.accessibilityReduceTransparency) var reduceTransparency

@Environment(.dismiss) var dismiss

@Environment(.colorScheme) var scheme