RandomBlobs

A project that shows how to create random, non-selfintersecting smoothly curved shapes using UIBezierPaths and Catmull-Rom spline based smoothing. (With a tip of the hat to Erica Sadun, who's path smoothing recipe is a key component.)

This project demonstrates a number of iOS aninimation and drawing techniques, as well as a few others.

##Animation Techniques

• Using Catmull-Rom splines to create a path out of a set of points, where all the points are on a curve.
• Creating an animated shape using a CAShapeLayer and a CABasicAnimation that changes the layer's path
• Animating an object along a path (link: path animation)
  • Doing keyframe animation animation using the new iOS 7 UIView method animateKeyframesWithDuration:delay:options:animations:completion:
  • Duplicating the results of animateKeyframesWithDuration:delay:options:animations:completion: using Core Animation CAKeyframeAnimation and an array of points
  • Creating keyframe animations using a CAKeyframeAnimation and a CGPath

##Miscellaneous techniques

• Using block-based NSNotificationCenter observers
• [Sliding your views to make room for the keyboard](Shifting text views for the keyboard.md)