The flipbook from frosty

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Recommend the use of ImageOptim

Not sure if Xcode's image conversion on sending to the app makes this useless, but I tend to run this on any generated png.

Add @objc to Flipbook class for easy integration with Objective-C projects

It was no problem doing this myself in my own local copy, though would be annoying to keep doing it with no projects.

Rotating an image

I expect a lot of people will be interested in this, so I'm putting up my example code. This uses core image to rotate the image inside an imageview and records the rotation into a animation.

This is because I couldn't get a transform to work on my snapshots how I would normally do it:

        let number = CGFloat(-1.01 * M_PI)
        let rotationTransform = CATransform3DMakeRotation(number, 0, 0, 1)
        let rotationAnimation = CABasicAnimation(keyPath: "transform")

        rotationAnimation.toValue = NSValue(CATransform3D: rotationTransform);
        rotationAnimation.duration = 0.4
        rotationAnimation.cumulative = true
        rotationAnimation.repeatCount = 10000;

        let image = UIImage(named: "Spinner-0");
        let imageView = UIImageView(image: image);
        imageView.layer.addAnimation(rotationAnimation, forKey:"transform")

        let outer = UIView(frame: imageView.bounds)
        outer.addSubview(imageView)

        view.addSubview(outer)
        arcFlipbook = Flipbook()

        arcFlipbook.renderTargetView(outer, imagePrefix: "Progress-Spinner", frameCount: 20) { (view, frame) in
            return
        }