Creating and Destroying Objects for passing between Views

Question

Overview of app

My RVC has an object of custom type 'Entry' that has various values (AssetURL, Notes for item). I pass an instance of this to two viewControllers in order to add information about the Entry into this instance for saving. I do this successfully, but am unsure about how I should be creating / destroying my objects. If I try to use the myEntry object a second time around I get a bad access error. I assume this is something simple I have overlooked in my self-taughtedness.

RootViewController myEntry;

• RootViewController

  -- Click + (Add) button

  -- Create instance of AssetPickerController

  -- Set instance entry to that of my RVC Entry so as to set values of the RVC Entry in the AssetPickerController (AssetPickerController.assetEntry = myEntry;)

  -- Load AssetPickerController

• AssetPickerController

  -- Select asset from generated table of assets

  -- update assetEntry.URL (this flows back to the RVC myEntry instance)

  --> RootViewController - didPickURlNotification

  -- Load AssetDetailsController

  -- AssetDetailsController.assetDetailsEntry = myEntry (to get values passed back to RVC)

• AssetDetailsController --> Enter some notes in a field, save the to entry (this flows back to the RVC)

  -->Push save Button

  --> RootViewController - didCreateEntryNotification

  --> Save and write to Data model to store Entry

This all works - once! As soon as I try and reset any variables to perform the operation again I get bad access errors!

Can someone please point out the n00b mistake I'm clearly making!? I hope my pseudo code is enough for you to assist.