This is an pure objective-c (not Cocos2d) joystick implement.
There are three images.
stick_base.png
stick_normal.png
stick_hold.png
You can change them or add your new images for the joystick.
The size of the joystick in the demo is 128 * 128, so in the JoyStickView, I set the center point to (64, 64).
If your joystick has a different size, please modify it.