19@property(readonly,nonatomic) intcurrentPage; /**< Returns the current page number, Note that the first page is numbered 1 */
20@property(readonly,nonatomic) intlastPage; /**< The current highest page number. */
21@property(readonly,nonatomic) inttotalNumberOfLines; /**< the total number of lines. */
22@property(readonly,nonatomic) BOOL dirty; /**< Returns whether the page is 'dirty', meaning that has been returned for it is currently out of date and the page needs to be refreshed. */