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Koze/TableViewCell.swift

Last active Mar 6, 2020
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Adding SwiftUI preview implementation to existing view class
//
// TableViewCell.swift
// iOS12App
//
// Created by Kazuma Koze on 2020/03/05.
// Copyright © 2020 Climb App. All rights reserved.
//
import UIKit
import SwiftUI
class TableViewCell: UITableViewCell {
@IBOutlet weak var titleLabel: UILabel!
@IBOutlet weak var subheadLabel: UILabel!
@IBOutlet weak var bodyLabel: UILabel!
@IBOutlet weak var stackView: UIStackView!
override func awakeFromNib() {
super.awakeFromNib()
// for SwiftUI preview
setContentHuggingPriority(.defaultHigh, for: .vertical)
updateStackViewAxis(traitCollection.preferredContentSizeCategory.isAccessibilityCategory)
}
override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
super.traitCollectionDidChange(previousTraitCollection)
let isAccessibilityCategory = traitCollection.preferredContentSizeCategory.isAccessibilityCategory
if isAccessibilityCategory != previousTraitCollection?.preferredContentSizeCategory.isAccessibilityCategory {
updateStackViewAxis(isAccessibilityCategory)
}
}
private func updateStackViewAxis(_ isAccessibilityCategory: Bool) {
stackView.axis = isAccessibilityCategory ? .vertical : .horizontal
stackView.alignment = isAccessibilityCategory ? .leading : .center
}
// for SwiftUI preview
override var intrinsicContentSize: CGSize {
return systemLayoutSizeFitting(UIView.layoutFittingCompressedSize)
}
}
#if DEBUG
@available(iOS 13.0, *)
struct TableViewCellPreview: PreviewProvider, UIViewRepresentable {
typealias UIViewType = TableViewCell
static var previews: some View {
Group {
Self()
.environment(\.sizeCategory, .medium)
.previewLayout(.sizeThatFits)
Self()
.environment(\.sizeCategory, .accessibilityExtraExtraExtraLarge)
.previewLayout(.sizeThatFits)
}
}
func makeUIView(context: UIViewRepresentableContext<Self>) -> UIViewType {
let nib = UINib(nibName: String(describing: UIViewType.self), bundle: nil)
let cell = nib.instantiate(withOwner: nil, options: nil).first as! UIViewType
return cell
}
func updateUIView(_ uiView: UIViewType, context: UIViewRepresentableContext<Self>) {
}
}
#endif
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