In case you didn't realize the coolest part of this post: mouse over the lines of code that draw the béziers. The diagrams showing béziers drawn by the code update as you mouse over each line.
A few of the bézier diagrams with visible control points are interactive too.
Few weeks ago, I tried to create a roulette wheel for an iOS application. For ball animation, I used CGPath but couldn't make a realistic movement then I changed it to UIBezierPath.
Note: You can't draw rounded corners using Bezier curves. Only an approximation. ;)
While this is true, the author actually uses simple arcs on the path for the rounded corners (most Bezier interfaces are implemented in a path that also supports simple lines and arcs). In fact, there's only 1 Bezier in the path from the article, the wavy line in the very last image. See the addCurveToPoint and addQuadCurveToPoint methods for drawing cubic and quadratic Bezier curves