I'm looking for a simple Swift solution for a child view to programmatically fill a super view using NSLayoutContraint. It should be easy to understand. I feel like most of the answers on here currently are more complex than needed.
Assuming that you've already set
false and added
subview as a subview of
view, you can set the four constraints, like so:
NSLayoutConstraint.activateConstraints([ subview.leadingAnchor.constraintEqualToAnchor(view.leadingAnchor), subview.trailingAnchor.constraintEqualToAnchor(view.trailingAnchor), subview.topAnchor.constraintEqualToAnchor(view.topAnchor), subview.bottomAnchor.constraintEqualToAnchor(view.bottomAnchor) ])
Or in Swift 3:
NSLayoutConstraint.activate([ subview.leadingAnchor.constraint(equalTo: view.leadingAnchor), subview.trailingAnchor.constraint(equalTo: view.trailingAnchor), subview.topAnchor.constraint(equalTo: view.topAnchor), subview.bottomAnchor.constraint(equalTo: view.bottomAnchor) ])