为什么 peoplePickerDelegate 没有正确获取代表的地址？

Question

场景是我有多个视图想要调用地址簿。为了不在每个视图中重复委托的代码，我已将代码放在应用程序委托的标头和 .m 文件中，但在 2 个相应应用程序的底部使用“@interface AddressBookDelegate”和“@implementation AddressBookDelegate”委托 fiies-

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

然后

@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;
}

在我的视图中我有以下代码：

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

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

地址簿在所有视图中显示良好。但是，当我执行任何会调用委托的用户操作（例如地址簿的取消按钮）时，我会崩溃-

-[MyprogAppDelegate peoplePickerNavigationControllerDidCancel:]：无法识别的选择器发送到实例

它编译干净，没有警告。

当 peoplePickerDelegate 与视图本身不在物理上位于同一文件中时，如何连接 peoplePickerDelegate 以连接到地址委托代码？谢谢。

添加注意：当我使用调试器并停止在视图代码中的行时

abPicker.peoplePickerDelegate = addressBookDelegate;

，我看到 addressBookDelegate 的地址被声明为 MyprogAppDelegate 的地址，而不是我预期的 AddressBookDelegate 的地址。这让我认为地址簿委托代码的位移在应用程序委托文件中已关闭。

如果 AddressBookDelegate 取消委托代码在 AddressBookDelegate 中输入 1000 字节，那么我的应用程序实际上是将 1000 字节代码“输入”到 MyprogAppDelegate 中，因此崩溃。所以不知何故我没有正确设置 AddressBookDelegate 的寻址。无论如何，这就是我的看法......

Answer 1

最终我未能使上述任何建议都按预期执行。我不得不缩短时间并继续前进，因此我在每个视图中复制了代码。我将再次讨论这个问题，因为我确信它可以通过比我结束时更基于对象的方式来完成。

Answer 2

您的代码假定您的 appdelegate (MyprogAppDelegate) 实现方法 peoplePickerNavigationControllerDidCancel。

因此，MyprogAppDelegate 中的代码应该如下所示：

@implementation MyprogAppDelegate
@synthesize ...;

#pragma mark -
#pragma mark Application lifecycle
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    


    return YES;
}

- (void)peoplePickerNavigationControllerDidCancel:(ABPeoplePickerNavigationController *)peoplePicker{

}

Answer 3

编辑好的，整个第一个答案已经被扔掉了。带着一些警告，这仍然有点盲目，但我认为它会更接近有用。不过，有些想法确实延续了下来。

1. 您很可能不需要单独的类来充当您的ABPeoplePickerNavigationControllerDelegate。很可能，它应该是与您的代码位于底部的同一个类（调用 presentModalViewController:animated:。由于我不知道那是什么控制器，所以我将只调用它 MyViewController 供参考。您希望该视图控制器成为委托的原因是，在您的委托方法中，您需要能够关闭具有地址簿的模式视图控制器。

2. 您肯定不希望程序的UIApplicationDelegate成为ABPeoplePickerNavigationControllerDelegate。正如您自己所说，peoplePickerDelegate 必须是 UIViewController。

所以，到MyViewController。首先，界面：

/* MyViewController.h */

@interface MyViewController : UIViewController<ABPeoplePickerNavigationControllerDelegate>
...
@end

您的控制器可能继承自 UIViewController 的后代（例如表视图控制器或类似的东西） - 不应该改变，唯一应该改变的是将 ABPeoplePickerNavigationControllerDelegate 添加到已实施协议的列表。

现在，要实现该功能：

/* MyViewController.m */

@implementation MyViewController

...
- (void) whateverMethodIsDisplayingTheAddressBook
{
    ABPeoplePickerNavigationController *abPicker = [[ABPeoplePickerNavigationController alloc]init];    
    abPicker.peoplePickerDelegate = self; // This view controller is the delegate
    [self presentModalViewController:abPicker animated:YES];
    [abPicker release];
}

...

- (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;
}

@end