A UIView extension for common auto layout constraints

UIView+AutoLayout.swift

extension UIView {
    func addConstaintsToPinHorizontalEdgesToSuperView(padding: CGFloat = 0) {
        prepareForConstraints()
        self.superview!.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-(padding)-[view]-(padding)-|",
            options: NSLayoutFormatOptions(0),
            metrics: ["padding":padding],
            views: ["view":self]))
    }
    
    func addConstaintsToPinVerticalEdgesToSuperView(padding: CGFloat = 0) {
        prepareForConstraints()
        self.superview!.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-(padding)-[view]-(padding)-|",
            options: NSLayoutFormatOptions(0),
            metrics: ["padding":padding],
            views: ["view":self]))
    }
    
    func addConstaintsToCenterVertically() {
        prepareForConstraints()
        self.superview!.addConstraint(NSLayoutConstraint(item: self,
            attribute: .CenterY,
            relatedBy: .Equal,
            toItem: self.superview!,
            attribute: .CenterY,
            multiplier: 1.0, constant: 0))
    }
    
    func addConstaintsToCenterHorizontally() {
        prepareForConstraints()
        self.superview!.addConstraint(NSLayoutConstraint(item: self,
            attribute: .CenterX,
            relatedBy: .Equal,
            toItem: self.superview!,
            attribute: .CenterX,
            multiplier: 1.0, constant: 0))
    }
    
    func addConstaintsToPinLeadingToSuperview(constant: CGFloat) -> NSLayoutConstraint {
        prepareForConstraints()
        let constraint = NSLayoutConstraint(item: self,
            attribute: .Leading,
            relatedBy: .Equal,
            toItem: self.superview!,
            attribute: .Leading,
            multiplier: 1, constant: constant)
        
        self.superview!.addConstraint(constraint)
        return constraint
    }
    
    func addConstaintsToPinTrailingToSuperview(constant: CGFloat) -> NSLayoutConstraint {
        prepareForConstraints()
        let constraint = NSLayoutConstraint(item: self,
            attribute: .Trailing,
            relatedBy: .Equal,
            toItem: self.superview!,
            attribute: .Trailing,
            multiplier: 1, constant: constant)
        self.superview!.addConstraint(constraint)
        return constraint
    }
    
    func addConstaintsToPinTopToSuperview(constant: CGFloat) -> NSLayoutConstraint {
        prepareForConstraints()
        let constraint = NSLayoutConstraint(item: self,
            attribute: .Top,
            relatedBy: .Equal,
            toItem: self.superview!,
            attribute: .Top,
            multiplier: 1, constant: constant)
        self.superview!.addConstraint(constraint)
        return constraint
    }
    
    func addConstaintsToPinTopToView(view:UIView,constant: CGFloat) -> NSLayoutConstraint {
        prepareForConstraints()
        let constraint = NSLayoutConstraint(item: self,
            attribute: .Top,
            relatedBy: .Equal,
            toItem: view,
            attribute: .Top,
            multiplier: 1, constant: constant)
        self.superview!.addConstraint(constraint)
        return constraint
    }
    
    func addConstaintsToPinBottomToView(view:UIView,constant: CGFloat) -> NSLayoutConstraint {
        prepareForConstraints()
        let constraint = NSLayoutConstraint(item: self,
            attribute: .Bottom,
            relatedBy: .Equal,
            toItem: view,
            attribute: .Bottom,
            multiplier: 1, constant: constant)
        self.superview!.addConstraint(constraint)
        return constraint
    }
    
    
    func addConstaintsToFillSuperviewWithPadding(padding: CGFloat = 0) {
        prepareForConstraints()
        addConstaintsToPinHorizontalEdgesToSuperView(padding: padding)
        addConstaintsToPinVerticalEdgesToSuperView(padding: padding)
    }
    
    private func prepareForConstraints() {
        self.setTranslatesAutoresizingMaskIntoConstraints(false)
        if superview == nil {
            assert(false, "You need to have a superview before you can add contraints")
        }
    }
}