public init(
    title: String,
    appearance: TagView.Appearance = .default
)

let tagView = TagView(title: "Hello World!!")

let tagView = TagView(
    title: "Hello world!",
    appearance: TagView.Appearance(
        backgroundColor: .blue,
        borderColor: .black,
        shape: .rectangle
    )
)

let tagView = TagView(
    title: "Hello world!",
    appearance: TagView.Appearance(
        icon: TagView.Appearance.LeadingIcon(image: cube)
    )
)

let tagView = TagView(
    title: "Hello world!",
    appearance: TagView.Appearance(
        closeButton: TagView.Appearance.CloseButton()
    )
)

public struct Appearance {
    /// A tuple consisting of `textColor` and `typography` for the title label.
    /// Default is `(.label, .systemLabel)`.
    public var title: (textColor: UIColor, typography: Typography)
    /// Tag view background color. Default is `.clear`.
    public var backgroundColor: UIColor
    /// Border color. Default is `.label`.
    public var borderColor: UIColor
    /// border width. Default is `1`.
    public var borderWidth: CGFloat
    /// Leading icon appearance. Default is 'nil` (no leading icon).
    public var icon: LeadingIcon?
    /// Close button appearance. Default is 'nil` (no close button).
    public var closeButton: CloseButton?
    /// Tag view layout properties such as spacing between views. Default is `.default`.
    public var layout: Layout
    /// Tag shape. Default is `.capsule`.
    public var shape: Shape
    /// Whether a leading icon is present or not.
    var hasIcon: Bool { icon != nil }
    /// Whether a close button is present or not.
    var hasCloseButton: Bool { closeButton != nil }
}

// Declare a tag view.
let tagView = TagView(title: "Hello World!!")

// Change background color, border color, shape, text color, and typography.
tagView.appearance.backgroundColor = .red
tagView.appearance.borderColor = .black
tagView.appearance.shape = .rectangle
tagView.appearance.title =  (.secondaryLabel, .smallSystem)