forked from zelo72/mastodon-ios
108 lines
3.4 KiB
Swift
108 lines
3.4 KiB
Swift
//
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// PrimaryActionButton.swift
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// Mastodon
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//
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// Created by BradGao on 2021/2/20.
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//
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import UIKit
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class PrimaryActionButton: UIButton {
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private var originalButtonTitle: String?
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lazy var activityIndicator: UIActivityIndicatorView = {
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let indicator = UIActivityIndicatorView(style: .medium)
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indicator.color = .white
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indicator.hidesWhenStopped = true
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indicator.translatesAutoresizingMaskIntoConstraints = false
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return indicator
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}()
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var adjustsBackgroundImageWhenUserInterfaceStyleChanges = true
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var action: Action = .next {
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didSet {
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setupAppearance(action: action)
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}
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}
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var isLoading: Bool = false
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override init(frame: CGRect) {
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super.init(frame: frame)
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_init()
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}
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required init?(coder: NSCoder) {
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super.init(coder: coder)
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_init()
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}
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}
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extension PrimaryActionButton {
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public enum Action {
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case back
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case next
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}
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}
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extension PrimaryActionButton {
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private func _init() {
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titleLabel?.font = UIFontMetrics(forTextStyle: .headline).scaledFont(for: .systemFont(ofSize: 17, weight: .semibold))
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setTitleColor(.white, for: .normal)
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setupAppearance(action: action)
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applyCornerRadius(radius: 10)
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}
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func setupAppearance(action: Action) {
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switch action {
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case .back:
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setTitleColor(Asset.Colors.Label.primary.color, for: .normal)
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setBackgroundImage(UIImage.placeholder(color: Asset.Scene.Onboarding.navigationBackButtonBackground.color), for: .normal)
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setBackgroundImage(UIImage.placeholder(color: Asset.Scene.Onboarding.navigationBackButtonBackgroundHighlighted.color), for: .highlighted)
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setBackgroundImage(UIImage.placeholder(color: Asset.Colors.disabled.color), for: .disabled)
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case .next:
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setTitleColor(Asset.Colors.Label.primaryReverse.color, for: .normal)
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setBackgroundImage(UIImage.placeholder(color: Asset.Scene.Onboarding.navigationNextButtonBackground.color), for: .normal)
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setBackgroundImage(UIImage.placeholder(color: Asset.Scene.Onboarding.navigationNextButtonBackgroundHighlighted.color), for: .highlighted)
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setBackgroundImage(UIImage.placeholder(color: Asset.Colors.disabled.color), for: .disabled)
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}
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}
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override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
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super.traitCollectionDidChange(previousTraitCollection)
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if adjustsBackgroundImageWhenUserInterfaceStyleChanges {
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setupAppearance(action: action)
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}
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}
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func showLoading() {
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guard !isLoading else { return }
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isEnabled = false
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isLoading = true
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originalButtonTitle = title(for: .disabled)
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self.setTitle("", for: .disabled)
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addSubview(activityIndicator)
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NSLayoutConstraint.activate([
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activityIndicator.centerXAnchor.constraint(equalTo: self.centerXAnchor),
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activityIndicator.centerYAnchor.constraint(equalTo: self.centerYAnchor),
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])
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activityIndicator.startAnimating()
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}
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func stopLoading() {
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guard isLoading else { return }
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isLoading = false
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if activityIndicator.superview == self {
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activityIndicator.removeFromSuperview()
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}
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isEnabled = true
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self.setTitle(originalButtonTitle, for: .disabled)
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}
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}
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