Question

The scenario is that I have more than one view that wants to invoke the Address Book. So as not to duplicate the code of the delegate in each view I have located the code in the App Delegate’s header and .m file, but using an “@interface AddressBookDelegate” and “@implementation AddressBookDelegate” at the bottom of the 2 respective App Delegate fiies-

@interface AddressBookDelegate : UIViewController <ABPeoplePickerNavigationControllerDelegate> {
AddressBookDelegate *addressBookDelegate;   
}
@property (nonatomic, retain) AddressBookDelegate *addressBookDelegate;
@end

and

@implementation AddressBookDelegate
@synthesize addressBookDelegate;

- (void)peoplePickerNavigationControllerDidCancel: (ABPeoplePickerNavigationController *)peoplePicker 
{
    [self dismissModalViewControllerAnimated:YES];
}

- (BOOL)peoplePickerNavigationController:(ABPeoplePickerNavigationController *)peoplePicker shouldContinueAfterSelectingPerson:(ABRecordRef)person
{   
    [super dismissModalViewControllerAnimated:YES];

    ...get stuff from the Address Book...   

    return NO;
}

- (BOOL)peoplePickerNavigationController:(ABPeoplePickerNavigationController *)peoplePicker shouldContinueAfterSelectingPerson:(ABRecordRef)person 
                            property:(ABPropertyID)property identifier:(ABMultiValueIdentifier)identifier
{
    return NO;
}

Then in my views I have the following code:

addressBookDelegate = (AddressBookDelegate *) [[UIApplication sharedApplication] delegate];

ABPeoplePickerNavigationController *abPicker = [[ABPeoplePickerNavigationController alloc]init];    
abPicker.peoplePickerDelegate = self.addressBookDelegate;
[self presentModalViewController:abPicker animated:YES];
[abPicker release];

The Address Book displays fine in all views. But when I take any user action that would invoke a delegate, like the Address Book’s Cancel button, I crash-

-[MyprogAppDelegate peoplePickerNavigationControllerDidCancel:]: unrecognized selector sent to instance

It compiles clean, no Warnings.

How do I wire-up the peoplePickerDelegate to connect to the Address Delegate code when it is not physically in the same file as the view itself ? Thx.

ADDED NOTE: when I use the debugger and stop on the line

abPicker.peoplePickerDelegate = addressBookDelegate;

in the view code, I see that the address for the addressBookDelegate is stated to be the address of the MyprogAppDelegate, not AddressBookDelegate as I might have expected. That makes me think the displacement to the address book delegate code is off within the App Delegate file.

If the AddressBookDelegate Cancel Delegate code were say 1000 bytes into the AddressBookDelegate, my app is actually “entering” the code 1000 bytes into MyprogAppDelegate, and so crashes. So somehow I am not setting up the addressing of the AddressBookDelegate correctly. That’s my take on it anyway…

Answer 1

In the end I was not able to make any of the above suggestions perform as hoped for. I had to cut time and move on so I duplicated the code in each view. I will revisit this another time, as I am sure it can be done in a more object based way than I ended it doing it.