SmoothBezier is a category of UIBezierPath, which can help you create smooth bezier path.
First of all, you should import header file to your source file.
#import <UIBezierPath+SmoothBezier.h>
And then follow the code below.
UIBezierPath *bezierPath = [UIBezierPath bezierPath];
// pointValues is an array that stores point.
[bezierPath smoothPath:pointValues CurveLevel:0.6];
It's done. Now you get a smooth bezier path.