Question

I am new to iOS. I am trying to set a bool in a view controller in the prepareforsegue method that leads to that view controller. When I try to to set the bool, i get an EXC_BAD_ACCESS error. What can I do to fix this problem?

   addBookViewController  *addViewController = [segue destinationViewController];
   Book *temp = [self.dataController objectInListAtIndex:[self.tableView indexPathForSelectedRow].row];
   addViewController.book = temp;
   *addViewController.editMode=YES; //EXC_BAD_ACCESS (Code =0, address=0x0)

here is the header file for the destination view controller:

   @interface addBookViewController : UITableViewController <UITextFieldDelegate>
    @property (strong, nonatomic) Book *book;
    @property (assign) BOOL *editMode;
    @end

Answer 1

BOOL is not an object type, it’s a primitive (scalar). You don’t need pointers to it. Change

@property (assign) BOOL *editMode;

into

@property (assign) BOOL editMode;

and also change

*addViewController.editMode=YES;

to

addViewController.editMode=YES;

and please read a tutorial on C pointers.