🔸foreground
╱🚧 under construction -> current context
SwiftUI ⟩ view ⟩ drawing ⟩ foreground
foreground element：前景元素
view.foregroundStyle()：設定前景元素的 ShapeStyle。
HStack {
Image(systemName: "triangle.fill")
Text("Hello, world!")
RoundedRectangle(cornerRadius: 5)
.frame(width: 40, height: 20)
}
// ⭐️ view.foregroundStyle(shapeStyle)
.foregroundStyle(.teal)SwiftUI ⟩
ShapeStyle ⟩ foreground (static)：foreground style in the current context.
View ⟩ .foregroundStyle(_:) ：set a new foreground style for a given view and its child views.
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