UIImageView+SDWebImageColor

import UIKit
import SDWebImage

extension UIImageView {
    func sd_setFadeImageWithURL(url: NSURL!, placeholderImage: UIImage!) {
        if let placeholderImage = placeholderImage {
            sd_setImageWithURL(url, placeholderImage: placeholderImage, options: .AvoidAutoSetImage) { (image, error, cache, url) -> Void in
                if cache == SDImageCacheType.None {
                    UIView.transitionWithView(self, duration: 0.35, options: [.TransitionCrossDissolve, .CurveEaseOut], animations: { () -> Void in
                        self.image = image
                        }, completion: nil)
                } else {
                    self.image = image
                }
            }
        } else {
            sd_setImageWithURL(url)
        }
    }
}