title: CATransition with filter in iOS
body: <p>I'm trying to set a filter to CATransition. What seems to be so simple turned out problematic - it seems that the filter property is being ignored by CATransition and I'm left with the default fade effect (?!)</p>
  
  <pre><code>UIImage *start = [UIImage imageNamed:@"start"];
  UIImage *target = [UIImage imageNamed:@"target"];
  
  CIImage *startImg = [CIImage imageWithCGImage:start.CGImage];
  CIImage *endImg = [CIImage imageWithCGImage:target.CGImage];
  
  CIFilter *filter = [CIFilter filterWithName:@"CICopyMachineTransition" keysAndValues:
                      @"inputImage" , startImg,
                      @"inputTargetImage" , endImg,
                      @"inputTime" , @1.0, nil];
  
  CATransition *transition = [CATransition new];
  
  transition.duration = 1.75;
  transition.filter = filter;
  
  [self.imageView.layer addAnimation:transition forKey:kCATransition];
  
  self.imageView.image = target;
  </code></pre>