UIStackView SpacerView

UIStackView+SpacerViews.swift

/**! Currently these two cause this warning:
This NSLayoutConstraint is being configured with a constant that exceeds internal limits.  
A smaller value will be substituted, but this problem should be fixed. 
Break on BOOL _NSLayoutConstraintNumberExceedsLimit(void) to debug.  This will be logged only once.  
This may break in the future.
*/
extension UIStackView {
  /// A vertical spacer view that will expand to fill the available space
  fileprivate func verticalSpacer() -> UIView {
    let v = UIView()
    v.translatesAutoresizingMaskIntoConstraints = false
    let constraint = v.heightAnchor.constraint(equalToConstant: .greatestFiniteMagnitude)
    constraint.priority = .defaultLow
    constraint.isActive = true
    return v
  }
  
  /// A horizontal spacer view that will expand to fill the available space
  fileprivate func horizontalSpacer() -> UIView {
    let v = UIView()
    v.translatesAutoresizingMaskIntoConstraints = false
    let constraint = v.widthAnchor.constraint(equalToConstant: .greatestFiniteMagnitude)
    constraint.priority = .defaultLow
    constraint.isActive = true
    return v
}