System/Library/Frameworks/SpriteKit.framework

SKSpringFieldNode.h

NSObject
>
UIResponder
>
SKNode
>
SKFieldNode

@interface SKSpringFieldNode : SKFieldNode

+ (BOOL)supportsSecureCoding;

- (id)init;
- (void)encodeWithCoder:(id)a0;
- (id)initWithCoder:(id)a0;
- (void)_initialize;
- (id)_descriptionClassName;

@end