GenoZhou

public protocol ReusableView: class { }

extension ReusableView where Self: UIView {
    public static var reuseIdentifier: String {
        return String(describing: self)
    }
}

extension UITableViewCell: ReusableView { }
extension UITableViewHeaderFooterView: ReusableView { }

GenoZhou

extension UIView {
    public func addSubviews(_ subviews: [UIView], tAMIC: Bool = false) {
        for subview in subviews {
            addSubview(subview)
            subview.translatesAutoresizingMaskIntoConstraints = false
        }
    }
}

GenoZhou

extension UIView {
    @discardableResult
    public func constrainEdges(to view: UIView) -> [NSLayoutConstraint] {
        let constraints = [
            leadingAnchor.constraint(equalTo: view.leadingAnchor),
            topAnchor.constraint(equalTo: view.topAnchor),
            trailingAnchor.constraint(equalTo: view.trailingAnchor),
            bottomAnchor.constraint(equalTo: view.bottomAnchor)
        ]
        NSLayoutConstraint.activate(constraints)