metatext/Views/UIKit/CapsuleButton.swift

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// Copyright © 2021 Metabolist. All rights reserved.
import UIKit
final class CapsuleButton: UIButton {
override init(frame: CGRect) {
super.init(frame: frame)
initialSetup()
}
@available(*, unavailable)
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func layoutSubviews() {
super.layoutSubviews()
layer.cornerRadius = bounds.height / 2
}
override var isHighlighted: Bool {
didSet {
backgroundColor = isHighlighted ? Self.highlightedColor : .link
}
}
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override var isEnabled: Bool {
didSet {
backgroundColor = isEnabled ? .link : UIColor.link.withAlphaComponent(0.5)
}
}
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}
private extension CapsuleButton {
static let highlightedColor: UIColor = {
var hue: CGFloat = 0
var saturation: CGFloat = 0
var brightness: CGFloat = 0
var alpha: CGFloat = 0
UIColor.link.getHue(&hue, saturation: &saturation, brightness: &brightness, alpha: &alpha)
return UIColor(hue: hue, saturation: saturation, brightness: brightness * 3 / 4, alpha: alpha)
}()
func initialSetup() {
backgroundColor = .link
titleLabel?.adjustsFontForContentSizeCategory = true
titleLabel?.font = .preferredFont(forTextStyle: .headline)
setTitleColor(.white, for: .normal)
setTitleColor(.lightText, for: .highlighted)
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setTitleColor(.lightText, for: .disabled)
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}
}