UIImageView extension for calculated UIImageSize

UIImageView+imageDimensions.swift

//
//  UIImageView+imageFrame.swift
//  Tindex
//
//  Created by Koen Punt on 24-08-15.
//  Copyright (c) 2015 Koen Punt. All rights reserved.
//

import UIKit

/** imageFrame Extends UIImageView

*/
extension UIImageView {
    
    var imageSize: CGSize {
        get {
            if let image: UIImage = self.image {
                let widthRatio = image.size.width / self.frame.size.width
                let heightRatio = image.size.height / self.frame.size.height
                let ratio = maxElement([widthRatio, heightRatio])
                return CGSizeMake(image.size.width / ratio, image.size.height / ratio)
            }
            return CGSizeZero
        }
    }
    
    var imageFrame: CGRect {
        get {
            if let image: UIImage = self.image {
                let size = self.imageSize
                
                return CGRectMake((self.frame.size.width - size.width) / 2, (self.frame.size.height - size.height) / 2, size.width, size.height)
            }
            return CGRectZero
        }
    }
    
}