Описание тега uibezierpath
The UIBezierPath class lets you define a path consisting of straight and curved line segments and render that path in your custom views.
The UIBezierPath class lets you define a path consisting of straight and curved line segments and render that path in your custom views. You use this class initially to specify just the geometry for your path. Paths can define simple shapes such as rectangles, ovals, and arcs or they can define complex polygons that incorporate a mixture of straight and curved line segments. After defining the shape, you can use additional methods of this class to render the path in the current drawing context.
Its counterpart in OS X is nsbezierpath.