NSLayoutConstraint Multiplier Extension

NSLayoutConstraintMultiplierExtension.swift

extension NSLayoutConstraint {
	
	func setMultiplier(multiplier:CGFloat) -> NSLayoutConstraint {
		
		let newConstraint = NSLayoutConstraint(
			item: firstItem,
			attribute: firstAttribute,
			relatedBy: relation,
			toItem: secondItem,
			attribute: secondAttribute,
			multiplier: multiplier,
			constant: constant)
		
		newConstraint.priority = priority
		newConstraint.shouldBeArchived = self.shouldBeArchived
		newConstraint.identifier = self.identifier
		newConstraint.active = true
		
		NSLayoutConstraint.deactivateConstraints([self])
		NSLayoutConstraint.activateConstraints([newConstraint])
		return newConstraint
	}
	
}