jkosoy

// port of http://stackoverflow.com/a/17948778/3071224

import UIKit
import Foundation

extension CGSize {
    static func aspectFit(aspectRatio : CGSize, var boundingSize: CGSize) -> CGSize {
        let mW = boundingSize.width / aspectRatio.width;
        let mH = boundingSize.height / aspectRatio.height;

licvido

let toImage = UIImage(named:"image.png")
UIView.transitionWithView(self.imageView,
                          duration:5,
                          options: .TransitionCrossDissolve,
                          animations: { self.imageView.image = toImage },
                          completion: nil)