System/Library/PrivateFrameworks/ChatKit.framework
CKSyncController.h
@interface CKSyncController : NSObject
@property (nonatomic, getter=isRestoring) BOOL restoring;
@property (nonatomic) int restoreStateChangedToken;
@property (nonatomic) int attachmentRestoredToken;
+ (id)sharedInstance;
- (void)updateRestoreState;
- (id)init;
- (void)attachmentRestored;
- (void)postAttachmentRestored;
- (void)prioritizeAttachmentAtPath:(id)a0;
@end