你能看到更详细的代码吗？
@available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.0, *)
@frozen public struct HStack<Content> : View where Content : View {
/// Creates a horizontal stack with the given spacing and vertical alignment.
///
/// - Parameters:
/// - alignment: The guide for aligning the subviews in this stack. This
/// guide has the same vertical screen coordinate for every child view.
/// - spacing: The distance between adjacent subviews, or `nil` if you
/// want the stack to choose a default distance for each pair of
/// subviews.
/// - content: A view builder that creates the content of this stack.
@inlinable public init(alignment: VerticalAlignment = .center, spacing: CGFloat? = nil, @ViewBuilder content: () -> Content)
/// The type of view representing the body of this view.
///
/// When you create a custom view, Swift infers this type from your
/// implementation of the required `body` property.
public typealias Body = Never
}
SwiftUI并未包含在开源Swift项目中，但是有一个正在进行的项目正在构建Apple的SwiftUI DSL的开源实现。https://github.com/Cosmo/OpenSwiftUI
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我来说两句