10.16 定义枚举

//typedef NS_ENUM(NSInteger, ButtonState)

//{

//    ButtonStateNormal = 0,

//    ButtonStateDownLoading,

//    ButtonStatePause,

//    ButtonStateDone

//};

typedef enum

{

    ButtonStateNormal = 0,

    ButtonStateDownLoading,

    ButtonStatePause,

    ButtonStateDone

}ButtonState;

// 向上取整   3.3  -->> 4

    return ceilf(rect.size.height);