navigationController：willShowViewController：animated：issue

Question

我的应用程序现在只能与iOS 7和iOS 8兼容，我对此方法有疑问：

-(void)navigationController:(UINavigationController *)navigationController 
    willShowViewController:(UIViewController *)viewController 
    animated:(BOOL)animated
{
     ...
}

这仅在iOS 7中调用，文档并未说明在iOS 8或其他版本中已弃用。有什么不对，有什么想法吗？

我在小牛队中使用xcode版本6.0.1（6A317）

我在另一个类中声明了委托：

ABPeoplePickerNavigationController *contactos = [[ABPeoplePickerNavigationController alloc] init];
contactos.displayedProperties = [NSArray arrayWithObject:[NSNumber numberWithInt:kABPersonPhoneProperty]];

// Delegate
pickerDelegate = [[PickerDelegate alloc] init];
contactos.peoplePickerDelegate  = pickerDelegate;
contactos.topViewController.navigationController.delegate = pickerDelegate;

PickerDelegate.h：

#import <Foundation/Foundation.h>
#import <AddressBook/AddressBook.h>
#import <AddressBookUI/AddressBookUI.h>

@interface PickerDelegate : NSObject <UINavigationControllerDelegate, ABPeoplePickerNavigationControllerDelegate, ABPersonViewControllerDelegate, ABNewPersonViewControllerDelegate>
{
    ...
}

Answer 1

问题是你没有设置ABPeoplePickerNavigationController的delegate（UINavigationControllerDelegate）。您正在设置其pickerDelegate（ABPeoplePickerNavigationControllerDelegate），但这不是同一件事。