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If any of you still don't understand something, please tell me.

Of course. So i have two ViewControllers, one is called NovedadesViewController (1st image) and the other one called LectorPdfViewController (2nd 3rd 4th 5th images). When the app launches, the first to appear is the NovedadesViewController, where all the files are listed in a table. Then, in that table when you click on one row, the LectorPdfViewController is called and here is where the specific pdf file is displayed. When you finish "reading" the pdf you can close the presented view LectorPdfViewController and go back to NovedadesViewController with the table and all the files listed. The problem is when i called to LectorPdfViewController because, first the pdf is not displayed as you can see in the second image. Then if i close LectorPdfViewController and select again the row of the table, then the pdf is displayed. Also, if now i select any other row from the NovedadesViewController the last pdf is displayed but not this new pdf. Maybe you can understand the code better now. If you have any idea on how to solve this, please tell me. Thanks a lot for your reply!!!