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Swift. Useful UIView extension for adding constraints with format
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)
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