UIImage+Uncached.swift

import UIKit

extension UIImage {
    convenience init?(uncachedName name: String) {
        let deviceScale: Double = Double(UIScreen.mainScreen().scale)
        let scaleFactors = [1.0, 2.0, 3.0].sort { x, y -> Bool in
            let distanceA = abs(x - deviceScale)
            let distanceB = abs(y - deviceScale)
            return distanceA == distanceB ? x > y : distanceA < distanceB
        }

        for scale in scaleFactors {
            let suffix = String(format: "@%.fx", scale)
            let bundle = NSBundle.mainBundle()
            let resource: String = "\(name)\(suffix)"
            let pathExtension: String = (name as NSString).pathExtension
            if let path = bundle.pathForResource(resource, ofType: pathExtension.isEmpty ? "png" : pathExtension) {
                self.init(contentsOfFile: path)
                return
            }
        }

        return nil
    }
}