empty-table-view-cell.swift

class EmptyTableViewCell: UITableViewCell {
    
    var emptyModel: EmptyTableViewCellModel?
    
    public func setContent(emptyModel: EmptyTableViewCellModel) {
        self.emptyModel = emptyModel
    }
    
}

final class PlainEmptyTableViewCell: EmptyTableViewCell {
    
    public var icon: UIImage?
    public var descriptionText: String?
    public var actionText: String?
    public var action: (() -> ())?
    
    private lazy var rootWrapper: UIStackView = UIStackView()
    public lazy var iconImageView: UIImageView = UIImageView()
    public lazy var descriptionLabel: UILabel = UILabel()
    public lazy var actionButton: UIButton = UIButton(type: .system)
    
    override func awakeFromNib() {
        super.awakeFromNib()
    }
    
    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)
    }
    
    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        
        backgroundColor = .clear
        contentView.backgroundColor = .clear
        
        contentView.sv(rootWrapper)
        rootWrapper.fillContainer()
        let topSpacer = UIView()
        topSpacer.height(30)
        topSpacer.backgroundColor = .clear
        let bottomSpacer = UIView()
        bottomSpacer.height(20)
        bottomSpacer.backgroundColor = .clear
        let bottomSpacer2 = UIView()
        bottomSpacer2.height(20)
        bottomSpacer2.backgroundColor = .clear
        let labelSpacer = UIView()
        labelSpacer.backgroundColor = .clear
        labelSpacer.height(5)
        
        rootWrapper.addArrangedSubview(topSpacer)
        rootWrapper.addArrangedSubview(iconImageView)
        rootWrapper.addArrangedSubview(labelSpacer)
        rootWrapper.addArrangedSubview(descriptionLabel)
        rootWrapper.addArrangedSubview(bottomSpacer)
        rootWrapper.addArrangedSubview(actionButton)
        rootWrapper.addArrangedSubview(bottomSpacer2)
        rootWrapper.spacing = 8
        rootWrapper.alignment = .center
        rootWrapper.distribution = .fill
        rootWrapper.axis = .vertical
        
        iconImageView.contentMode = .scaleAspectFill
        iconImageView
            .width(70)
            .height(70)
        
        descriptionLabel.textColor = StyleHelper.style.textTertiaryColor
        descriptionLabel.textAlignment = .center
        descriptionLabel.font = StyleHelper.style.system12FontRegular
        descriptionLabel.numberOfLines = 4
        descriptionLabel.setContentCompressionResistancePriority(.defaultHigh, for: .horizontal)
        
        actionButton.titleLabel?.font = StyleHelper.style.system12FontRegular
        actionButton.tintColor = StyleHelper.style.lightBlueLinkColor
        actionButton.setImage(UIImage(named: "chevronRight")!.withRenderingMode(.alwaysTemplate), for: .normal)
        actionButton.addTarget(self, action: #selector(didTapActionButton), for: .touchUpInside)
        actionButton.imageEdgeInsets = UIEdgeInsets(top: 3, left: 0, bottom: 3, right: -2)
        actionButton.titleEdgeInsets = UIEdgeInsets(top: 0, left: 5, bottom: 0, right: -5)
        actionButton.semanticContentAttribute = .forceRightToLeft
        actionButton.contentVerticalAlignment = .center
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemleted")
    }
    
    override func layoutSubviews() {
        super.layoutSubviews()
        
        separatorInset = UIEdgeInsets(top: 0, left: bounds.size.width, bottom: 0, right: 0)
        
        let halfWidth = self.frame.width / 4.0
        rootWrapper.leadingConstraint?.constant = halfWidth / 2.0
        rootWrapper.trailingConstraint?.constant = -(halfWidth / 2.0)
    }
    
    override func setContent(emptyModel: EmptyTableViewCellModel) {
        super.setContent(emptyModel: emptyModel)
        setContent(icon: emptyModel.icon, description: emptyModel.descriptionText, action: emptyModel.actionText)
    }
    
}

extension PlainEmptyTableViewCell {
    
    @objc private func didTapActionButton() {
        parentDelegate?.didTapEmptyTableViewCellPrimaryAction()
    }
    
}

extension PlainEmptyTableViewCell {
    
    public func setContent(icon: UIImage = UIImage(named: "chat-no-ustars")!,
                           description: String = StringsHelper.standard.localized.itsKindOfLonelyOutThere,
                           action: String = "") {
        self.icon = icon
        self.descriptionText = description
        
        if action.isEmpty {
            self.actionButton.isHidden = true
        } else {
            self.actionText = action
        }
        
        iconImageView.image = icon
        descriptionLabel.text = description
        actionButton.setTitle(action, for: .normal)
    }
    
}

extension PlainEmptyTableViewCell {
    
    @objc private func didTapActionButton() {
        action?()
    }
    
}