PZXDynamicAnimatorView

重力弹球界面，以及滑动弹球的封装

`
//重力view使用方法

_gravityView = [[PZXDynamicAnimatorGravityView alloc]initWithFrame:CGRectMake(0, 64, WIDTH, HEIGHT-64)];

_gravityView.ballNum = 99;//弹球数量

_gravityView.ballSize = 20;//弹球size

[self.view addSubview:_gravityView];

//滑动弹球使用方法

_slidingView = [[PZXDynamicAnimatorSlidingView alloc]initWithFrame:CGRectMake(0, 61, WIDTH, HEIGHT-64)];

_slidingView.ballNum = 6;

_slidingView.ballSize = 50;

[self.view addSubview:_slidingView];

//具体见demo
`