IGListKit/Examples/Examples-iOS/IGListKitExamples/Views/LoadingCell.swift

/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

import UIKit

final class LoadingCell: UICollectionViewCell {

    private let activityIndicator: UIActivityIndicatorView = {
        let indicator = UIActivityIndicatorView(style: .medium)
        indicator.translatesAutoresizingMaskIntoConstraints = false
        indicator.color = .darkGray
        indicator.hidesWhenStopped = false
        return indicator
    }()

    override init(frame: CGRect) {
        super.init(frame: frame)
        setupViews()
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    private func setupViews() {
        contentView.addSubview(activityIndicator)

        NSLayoutConstraint.activate([
            activityIndicator.centerXAnchor.constraint(equalTo: contentView.centerXAnchor),
            activityIndicator.centerYAnchor.constraint(equalTo: contentView.centerYAnchor)
        ])

        activityIndicator.startAnimating()
    }

    override func prepareForReuse() {
        super.prepareForReuse()
        activityIndicator.startAnimating()
    }
}