73 lines
2.7 KiB
Swift
73 lines
2.7 KiB
Swift
import SwiftUI
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/// The size of a SwiftUI font.
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enum FontSize {
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case custom(CGFloat, Font.TextStyle?)
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case style(Font.TextStyle)
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/// The raw value in points.
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var value: CGFloat {
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switch self {
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case .custom(let size, _):
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return size
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case .style(let style):
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switch style {
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case .largeTitle:
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return UIFont.preferredFont(forTextStyle: .largeTitle).pointSize
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case .title:
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return UIFont.preferredFont(forTextStyle: .title1).pointSize
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case .title2:
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return UIFont.preferredFont(forTextStyle: .title2).pointSize
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case .title3:
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return UIFont.preferredFont(forTextStyle: .title3).pointSize
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case .body:
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return UIFont.preferredFont(forTextStyle: .body).pointSize
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case .headline:
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return UIFont.preferredFont(forTextStyle: .headline).pointSize
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case .callout:
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return UIFont.preferredFont(forTextStyle: .callout).pointSize
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case .subheadline:
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return UIFont.preferredFont(forTextStyle: .subheadline).pointSize
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case .footnote:
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return UIFont.preferredFont(forTextStyle: .footnote).pointSize
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case .caption:
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return UIFont.preferredFont(forTextStyle: .caption1).pointSize
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case .caption2:
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return UIFont.preferredFont(forTextStyle: .caption2).pointSize
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@unknown default:
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return UIFont.preferredFont(forTextStyle: .body).pointSize
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}
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}
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}
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/// The text style of the font.
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var style: Font.TextStyle {
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switch self {
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case .custom(_, let textStyle):
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return textStyle ?? .body
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case .style(let textStyle):
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return textStyle
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}
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}
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static func reflecting(_ font: Font) -> FontSize? {
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let mirror = Mirror(reflecting: font)
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guard let provider = mirror.descendant("provider", "base") else { return nil }
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return resolveFontSize(provider)
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}
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private static func resolveFontSize(_ provider: Any) -> FontSize? {
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let mirror = Mirror(reflecting: provider)
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if let size = mirror.descendant("size") as? CGFloat {
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return .custom(size, mirror.descendant("textStyle") as? Font.TextStyle)
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} else if let textStyle = mirror.descendant("style") as? Font.TextStyle {
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return .style(textStyle)
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}
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// recurse to handle modifiers.
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guard let provider = mirror.descendant("base", "provider", "base") else { return nil }
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return resolveFontSize(provider)
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}
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}
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