77 lines
2.9 KiB
Swift
77 lines
2.9 KiB
Swift
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extension UIView {
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enum HorizontalEdge { case left, leading, right, trailing }
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enum VerticalEdge { case top, bottom }
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enum Direction { case horizontal, vertical }
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enum Dimension { case width, height }
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private func anchor(from edge: HorizontalEdge) -> NSLayoutXAxisAnchor {
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switch edge {
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case .left: return leftAnchor
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case .leading: return leadingAnchor
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case .right: return rightAnchor
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case .trailing: return trailingAnchor
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}
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}
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private func anchor(from edge: VerticalEdge) -> NSLayoutYAxisAnchor {
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switch edge {
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case .top: return topAnchor
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case .bottom: return bottomAnchor
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}
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}
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@discardableResult
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func pin(_ constraineeEdge: HorizontalEdge, to constrainerEdge: HorizontalEdge, of view: UIView, withInset inset: CGFloat = 0) -> NSLayoutConstraint {
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translatesAutoresizingMaskIntoConstraints = false
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let constraint = anchor(from: constraineeEdge).constraint(equalTo: view.anchor(from: constrainerEdge), constant: inset)
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constraint.isActive = true
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return constraint
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}
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@discardableResult
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func pin(_ constraineeEdge: VerticalEdge, to constrainerEdge: VerticalEdge, of view: UIView, withInset inset: CGFloat = 0) -> NSLayoutConstraint {
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translatesAutoresizingMaskIntoConstraints = false
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let constraint = anchor(from: constraineeEdge).constraint(equalTo: view.anchor(from: constrainerEdge), constant: inset)
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constraint.isActive = true
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return constraint
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}
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func pin(to view: UIView) {
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[ HorizontalEdge.leading, HorizontalEdge.trailing ].forEach { pin($0, to: $0, of: view) }
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[ VerticalEdge.top, VerticalEdge.bottom ].forEach { pin($0, to: $0, of: view) }
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}
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@discardableResult
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func center(_ direction: Direction, in view: UIView) -> NSLayoutConstraint {
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translatesAutoresizingMaskIntoConstraints = false
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let constraint: NSLayoutConstraint = {
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switch direction {
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case .horizontal: return centerXAnchor.constraint(equalTo: view.centerXAnchor)
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case .vertical: return centerYAnchor.constraint(equalTo: view.centerYAnchor)
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}
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}()
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constraint.isActive = true
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return constraint
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}
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func center(in view: UIView) {
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center(.horizontal, in: view)
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center(.vertical, in: view)
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}
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@discardableResult
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func set(_ dimension: Dimension, to size: CGFloat) -> NSLayoutConstraint {
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translatesAutoresizingMaskIntoConstraints = false
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let constraint: NSLayoutConstraint = {
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switch dimension {
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case .width: return widthAnchor.constraint(equalToConstant: size)
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case .height: return heightAnchor.constraint(equalToConstant: size)
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}
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}()
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constraint.isActive = true
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return constraint
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}
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}
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