I have a view controller class that needs to implement several protocols. Too keep things neat. I have a habit of putting each protocol method in a category in a view controller class.
This time I get warnings from the linker that the class does not implement one of the protocols. Methods work at runtime, the linker simply cannot recognize the implementation in the category.
I simplified the class in another project and I get the same error in the same place.
Class header:
#import <UIKit/UIKit.h>
#import <AddressBook/AddressBook.h>
#import <AddressBookUI/AddressBookUI.h>
@interface TopVC : UIViewController
<
UINavigationControllerDelegate,
ABPeoplePickerNavigationControllerDelegate
>
{}
@end
TopVC.m (not shown) is automatically generated without modification. Protocol methods are UINavigationControllerDelegateimplemented in this category:
#import <Foundation/Foundation.h>
#import "TopVC.h"
@interface TopVC (UINavigationControllerDelegate)
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated;
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated;
@end
#import "TopVC+UINavigationControllerDelegate.h"
@implementation TopVC (UINavigationControllerDelegate)
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated{
NSLog(@"navigationController:willShowViewController:animated:");
}
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated{
NSLog(@"navigationController:didShowViewController:animated:");
}
@end
. , ABPeoplePickerNavigationControllerDelegate , :
#import "TopVC.h"
@interface TopVC (ABPeoplePickerNavigationControllerDelegate)
- (void)peoplePickerNavigationControllerDidCancel:(ABPeoplePickerNavigationController *)peoplePicker;
- (BOOL)peoplePickerNavigationController:(ABPeoplePickerNavigationController *)peoplePicker shouldContinueAfterSelectingPerson:(ABRecordRef)person;
- (BOOL)peoplePickerNavigationController:(ABPeoplePickerNavigationController *)peoplePicker shouldContinueAfterSelectingPerson:(ABRecordRef)person property:(ABPropertyID)property identifier:(ABMultiValueIdentifier)identifier;
@end
#import "TopVC+ABPeoplePickerNavigationControllerDelegate.h"
@implementation TopVC (ABPeoplePickerNavigationControllerDelegate)
- (void)peoplePickerNavigationControllerDidCancel:(ABPeoplePickerNavigationController *)peoplePicker{
}
- (BOOL)peoplePickerNavigationController:(ABPeoplePickerNavigationController *)peoplePicker shouldContinueAfterSelectingPerson:(ABRecordRef)person{
return YES;
}
- (BOOL)peoplePickerNavigationController:(ABPeoplePickerNavigationController *)peoplePicker shouldContinueAfterSelectingPerson:(ABRecordRef)person property:(ABPropertyID)property identifier:(ABMultiValueIdentifier)identifier{
return YES;
}
@end
:
warning: incomplete implementation of class 'TopVC'
warning: method definition for '-peoplePickerNavigationController:shouldContinueAfterSelectingPerson:property:identifier:' not found
warning: method definition for '-peoplePickerNavigationController:shouldContinueAfterSelectingPerson:' not found
warning: method definition for '-peoplePickerNavigationControllerDidCancel:' not found
warning: class 'TopVC' does not fully implement the 'ABPeoplePickerNavigationControllerDelegate' protocol
, , , UINavigationControllerDelegate , ABPeoplePickerNavigationControllerDelegate - .
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