iOS / Swift - Autolayout wrapper to reduce boilerplate

UIView.swift

extension UIView {
    var differentSuperviewsWarningMessage: String {
        return "Since you are adding a constraint to self.superview, self and the view passed in need to have the same superview. The views you are trying to align do not have the same superview."
    }
    
    func centerInSuperview() {
        self.centerVerticallyInSuperview()
        self.centerHorizontallyInSuperview()
    }
    
    func centerVerticallyInSuperview() {
        self.superview?.addConstraint(NSLayoutConstraint(
            item: self,
            attribute: .centerY,
            relatedBy: .equal,
            toItem: self.superview,
            attribute: .centerY,
            multiplier: 1,
            constant: 0)
        )
    }
    
    func centerHorizontallyInSuperview() {
        self.superview?.addConstraint(NSLayoutConstraint(
            item: self,
            attribute: .centerX,
            relatedBy: .equal,
            toItem: self.superview,
            attribute: .centerX,
            multiplier: 1,
            constant: 0)
        )
    }
    
    func leadingSpaceToSuperview(space: CGFloat) {
        self.superview?.addConstraint(NSLayoutConstraint(
            item: self,
            attribute: .leading,
            relatedBy: .equal,
            toItem: self.superview,
            attribute: .leading,
            multiplier: 1,
            constant: space)
        )
    }
    
    func trailingSpaceToSuperview(space: CGFloat) {
        self.superview?.addConstraint(NSLayoutConstraint(
            item: self,
            attribute: .trailing,
            relatedBy: .equal,
            toItem: self.superview,
            attribute: .trailing,
            multiplier: 1,
            constant: -space)
        )
    }
    
    func topSpaceToSuperview(space: CGFloat) {
        self.superview?.addConstraint(NSLayoutConstraint(
            item: self,
            attribute: .top,
            relatedBy: .equal,
            toItem: self.superview,
            attribute: .top,
            multiplier: 1,
            constant: space)
        )
    }
    
    func bottomSpaceToSuperview(space: CGFloat) {
        self.superview?.addConstraint(NSLayoutConstraint(
            item: self,
            attribute: .bottom,
            relatedBy: .equal,
            toItem: self.superview,
            attribute: .bottom,
            multiplier: 1,
            constant: -space))
    }
    
    func heightConstraint(height: CGFloat) {
        self.addConstraint(NSLayoutConstraint(
            item: self,
            attribute: .height,
            relatedBy: .equal,
            toItem: nil,
            attribute: .notAnAttribute,
            multiplier: 1,
            constant: height)
        )
    }
    
    func widthConstraint(width: CGFloat) {
        self.addConstraint(NSLayoutConstraint(
            item: self,
            attribute: .width,
            relatedBy: .equal,
            toItem: nil,
            attribute: .notAnAttribute,
            multiplier: 1,
            constant: width)
        )
    }
    
    func verticalSpacing(below view: UIView, space: CGFloat) {
        assert(self.superview == view.superview, differentSuperviewsWarningMessage)
        self.superview?.addConstraint(NSLayoutConstraint(
            item: self,
            attribute: .top,
            relatedBy: .equal,
            toItem: view,
            attribute: .bottom,
            multiplier: 1,
            constant: space)
        )
    }
    
    func verticalSpacing(above view: UIView, space: CGFloat) {
        assert(self.superview == view.superview, differentSuperviewsWarningMessage)
        self.superview?.addConstraint(NSLayoutConstraint(
            item: self,
            attribute: .bottom,
            relatedBy: .equal,
            toItem: view,
            attribute: .top,
            multiplier: 1,
            constant: -space)
        )
    }
    
    func horizontalSpacing(toRightOf view: UIView, space: CGFloat) {
        assert(self.superview == view.superview, differentSuperviewsWarningMessage)
        self.superview?.addConstraint(NSLayoutConstraint(
            item: self,
            attribute: .left,
            relatedBy: .equal,
            toItem: view,
            attribute: .right,
            multiplier: 1,
            constant: space)
        )
    }
    
    func horizontalSpacing(toLeftOf view: UIView, space: CGFloat) {
        assert(self.superview == view.superview, differentSuperviewsWarningMessage)
        self.superview?.addConstraint(NSLayoutConstraint(
            item: self,
            attribute: .right,
            relatedBy: .equal,
            toItem: view,
            attribute: .left,
            multiplier: 1,
            constant: -space)
        )
    }
}