Swift. Useful UIView extension for adding constraints with format

addConstraintsWithFormat.swift

extension UIView {

    func addConstraintsWithFormat(format: String, views: UIView...) {
        
        var viewsDict = [String: UIView]()
        
        for (index, view) in views.enumerated() {
            
            view.translatesAutoresizingMaskIntoConstraints = false
            viewsDict["v\(index)"] = view
        }
        
        addConstraints(NSLayoutConstraint.constraints(withVisualFormat: format, options: NSLayoutFormatOptions(), metrics: nil, views: viewsDict))
    }
    
    func addConstraintsFillEntireView(view: UIView) {
        addConstraintsWithFormat(format: "H:|[v0]|", views: view)
        addConstraintsWithFormat(format: "V:|[v0]|", views: view)
    }
}