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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
import UIKit
open class ResizableButton: UIButton {
public struct UX {
public static let buttonEdgeHorizontalSpacing: CGFloat = 8
public static let buttonEdgeVerticalSpacing: CGFloat = 0
}
public var buttonEdgeInsets = NSDirectionalEdgeInsets(top: UX.buttonEdgeVerticalSpacing,
leading: UX.buttonEdgeHorizontalSpacing,
bottom: UX.buttonEdgeVerticalSpacing,
trailing: UX.buttonEdgeHorizontalSpacing) {
didSet {
updateContentInsets()
}
}
override public init(frame: CGRect) {
super.init(frame: frame)
commonInit()
}
public required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
fatalError("init(coder:) has not been implemented")
}
override public var intrinsicContentSize: CGSize {
guard let title = titleLabel, let configuration else {
return super.intrinsicContentSize
}
let imagePadding = configuration.imagePadding
let widthContentInset = configuration.contentInsets.leading + configuration.contentInsets.trailing
let heightContentInset = configuration.contentInsets.top + configuration.contentInsets.bottom
var availableWidth = frame.width - widthContentInset
if let imageWidth = image(for: [])?.size.width ?? configuration.image?.size.width {
availableWidth = availableWidth - imageWidth - imagePadding
}
let size = title.sizeThatFits(CGSize(width: availableWidth, height: .greatestFiniteMagnitude))
return CGSize(width: size.width + widthContentInset,
height: size.height + heightContentInset)
}
override public func layoutSubviews() {
super.layoutSubviews()
guard let title = titleLabel else { return }
titleLabel?.preferredMaxLayoutWidth = title.frame.size.width
}
private func commonInit() {
titleLabel?.numberOfLines = 0
titleLabel?.adjustsFontForContentSizeCategory = true
adjustsImageSizeForAccessibilityContentSizeCategory = true
configuration = UIButton.Configuration.plain()
configuration?.titleLineBreakMode = .byWordWrapping
updateContentInsets()
}
private func updateContentInsets() {
configuration?.contentInsets = buttonEdgeInsets
}
}