Animate crossfade UIColor and UIImage with SDWebImage

UIImage+UIColor

//
//  UIImage+UIColor.swift
//

import UIKit

extension UIImage {
  class func imageWithColor(color: UIColor) -> UIImage {
    let rect = CGRectMake(0.0, 0.0, 1.0, 1.0)
    UIGraphicsBeginImageContext(rect.size)
    let context = UIGraphicsGetCurrentContext()
    
    CGContextSetFillColorWithColor(context, color.CGColor)
    CGContextFillRect(context, rect)
    
    let image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    
    return image
  }
}

UIImageView+SDWebImageColor

//
//  UIImageView+SDWebImageColor.swift
//
//

import UIKit
import SDWebImage

extension UIImageView {
  
  func sd_setImageWithURL(url: NSURL!, placeholderColor: UIColor?) {
    if let placeholderColor = placeholderColor {
      sd_setImageWithURL(url, placeholderImage: UIImage.imageWithColor(placeholderColor), 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)
    }
  }
  
}