an extension on UIImage for decompressing it before assigning to UIImageView. Recommended to run on a background thread

UIImage+ Decompress.swift

//
//  UIImage+Decompress.swift
//
//  Created by Hashem Aboonajmi on 15/02/2017
//

import UIKit

extension UIImage {
  
  var decompressed: UIImage {
    let rect = CGRect(x: 0, y: 0, width: size.width, height: size.height)
    let bitmapContext = CGContext(data: nil, width: Int(rect.size.width), height: Int(rect.size.height), bitsPerComponent: cgImage!.bitsPerComponent, bytesPerRow: cgImage!.bytesPerRow, space: cgImage!.colorSpace!, bitmapInfo: cgImage!.bitmapInfo.rawValue)
    bitmapContext?.draw(cgImage!, in: rect)
    let decompressedImageRef: CGImage = bitmapContext!.makeImage()!
    let decompressedImage = UIImage(cgImage: decompressedImageRef)

    return decompressedImage
  }
}