92 lines
3.5 KiB
Swift
92 lines
3.5 KiB
Swift
import UIKit
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public final class Button : UIButton {
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private let style: Style
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private let size: Size
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private var heightConstraint: NSLayoutConstraint!
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public enum Style {
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case unimportant, regular, prominentOutline, prominentFilled, regularBorderless, destructiveOutline
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}
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public enum Size {
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case medium, large, small
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}
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public init(style: Style, size: Size) {
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self.style = style
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self.size = size
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super.init(frame: .zero)
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setUpStyle()
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NotificationCenter.default.addObserver(self, selector: #selector(handleAppModeChangedNotification(_:)), name: .appModeChanged, object: nil)
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}
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override init(frame: CGRect) {
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preconditionFailure("Use init(style:) instead.")
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}
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required init?(coder: NSCoder) {
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preconditionFailure("Use init(style:) instead.")
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}
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deinit {
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NotificationCenter.default.removeObserver(self)
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}
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private func setUpStyle() {
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let fillColor: UIColor
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switch style {
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case .unimportant: fillColor = isLightMode ? UIColor.clear : Colors.unimportantButtonBackground
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case .regular: fillColor = UIColor.clear
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case .prominentOutline: fillColor = UIColor.clear
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case .prominentFilled: fillColor = isLightMode ? Colors.text : Colors.accent
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case .regularBorderless: fillColor = UIColor.clear
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case .destructiveOutline: fillColor = UIColor.clear
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}
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let borderColor: UIColor
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switch style {
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case .unimportant: borderColor = isLightMode ? Colors.text : Colors.unimportantButtonBackground
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case .regular: borderColor = Colors.text
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case .prominentOutline: borderColor = isLightMode ? Colors.text : Colors.accent
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case .prominentFilled: borderColor = isLightMode ? Colors.text : Colors.accent
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case .regularBorderless: borderColor = UIColor.clear
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case .destructiveOutline: borderColor = Colors.destructive
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}
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let textColor: UIColor
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switch style {
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case .unimportant: textColor = Colors.text
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case .regular: textColor = Colors.text
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case .prominentOutline: textColor = isLightMode ? Colors.text : Colors.accent
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case .prominentFilled: textColor = isLightMode ? UIColor.white : Colors.text
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case .regularBorderless: textColor = Colors.text
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case .destructiveOutline: textColor = Colors.destructive
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}
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let height: CGFloat
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switch size {
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case .small: height = Values.smallButtonHeight
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case .medium: height = Values.mediumButtonHeight
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case .large: height = Values.largeButtonHeight
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}
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if heightConstraint == nil { heightConstraint = set(.height, to: height) }
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layer.cornerRadius = height / 2
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backgroundColor = fillColor
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if #available(iOS 13.0, *) {
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layer.borderColor = borderColor
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.resolvedColor(
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// Note: This is needed for '.cgColor' to support dark mode
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with: UITraitCollection(userInterfaceStyle: isDarkMode ? .dark : .light)
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).cgColor
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} else {
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layer.borderColor = borderColor.cgColor
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}
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layer.borderWidth = 1
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let fontSize = (size == .small) ? Values.smallFontSize : Values.mediumFontSize
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titleLabel!.font = .boldSystemFont(ofSize: fontSize)
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setTitleColor(textColor, for: UIControl.State.normal)
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}
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@objc private func handleAppModeChangedNotification(_ notification: Notification) {
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setUpStyle()
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}
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}
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