init
+ (instancetype)button;
+ (instancetype)buttonWithOrigin:(CGPoint)origin;
config
@property (nonatomic, assign) NSUInteger lineNum;
@property (nonatomic, assign) CGFloat cornerRadius;
@property (nonatomic, assign) CGFloat duration;
@property (nonatomic, strong) NSArray *initializePositions;
setup
- (void)setup;
animation
- (void)startAnimation;
- (void)stopAnimation;