@class NSString; @interface FCObserver : NSObject <FCDisposable> @property (nonatomic) unsigned long long token; @property (weak, nonatomic) id keepAliveObject; @property (copy, nonatomic) id /* block */ observerBlock; @property (readonly) unsigned long long hash; @property (readonly) Class superclass; @property (readonly, copy) NSString *description; @property (readonly, copy) NSString *debugDescription; - (id)initWithToken:(unsigned long long)a0; - (id)init; - (void)dispose; - (void).cxx_destruct; - (BOOL)isEqual:(id)a0; - (void)disposeOn:(id)a0; @end