@class UIAttachmentBehavior; @interface _UISpringBehavior : UIDynamicBehavior { UIAttachmentBehavior *_topLeft; UIAttachmentBehavior *_topRight; UIAttachmentBehavior *_bottomRight; UIAttachmentBehavior *_bottomLeft; } @property (nonatomic) struct CGPoint { double x; double y; } anchorPoint; @property (nonatomic) double damping; @property (nonatomic) double frequency; - (id)init; - (void).cxx_destruct; - (id)initWithItem:(id)a0 anchorPoint:(struct CGPoint { double x0; double x1; })a1; @end