Constrain a subview to all the edges of its superview with one line.

UIViewExtensions.swift

/**
    UIViewExtensions.swift
    
    Constrain a subview to all the edges of its superview with one line.

    <https://gist.github.com/3dcab950560aea7ebc8f.git>
*/

import UIKit

extension UIView {
    
    func constrainToSuperview(superview: UIView) {
        self.setTranslatesAutoresizingMaskIntoConstraints(false)
        
        //align to edges of super view
        superview.addConstraint(
            NSLayoutConstraint(item: self, attribute: .Top, relatedBy: .Equal, toItem: superview, attribute: .Top, multiplier: 1, constant: 0)
        )
        superview.addConstraint(
            NSLayoutConstraint(item: self, attribute: .Right, relatedBy: .Equal, toItem: superview, attribute: .Right, multiplier: 1, constant: 0)
        )
        superview.addConstraint(
            NSLayoutConstraint(item: self, attribute: .Bottom, relatedBy: .Equal, toItem: superview, attribute: .Bottom, multiplier: 1, constant: 0)
        )
        superview.addConstraint(
            NSLayoutConstraint(item: self, attribute: .Left, relatedBy: .Equal, toItem: superview, attribute: .Left, multiplier: 1, constant: 0)
        )

    }
    
}