Question

场景是我有多个想要调用通讯簿的视图。为了不在每个视图中复制委托的代码，我将代码放在App Delegate的头文件和.m文件中，但在2个相应的应用程序的底部使用“@interface AddressBookDelegate”和“@implementation AddressBookDelegate”委派代表 -

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

和

@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;
}

然后在我的观点中，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都显示正常。但当我采取任何会调用委托的用户操作时，例如地址簿的取消按钮，我崩溃了 -

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

它编译干净，没有警告。

如果在与视图本身不在同一文件中时，如何连接peoplePickerDelegate以连接到Address Delegate代码？ THX。

增加注意：当我使用调试器并在线路上停止时

abPicker.peoplePickerDelegate = addressBookDelegate;

在视图代码中，我看到addressBookDelegate的地址被声明为MyprogAppDelegate的地址，而不是我可能预期的AddressBookDelegate。这让我觉得在App Delegate文件中，地址簿代理代码的位移是关闭的。

如果AddressBookDelegate取消委托代码在AddressBookDelegate中说1000字节，我的应用程序实际上是将代码“输入”MyprogAppDelegate中的1000字节，因此崩溃了。所以我不知道我没有正确设置AddressBookDelegate的地址。无论如何，这是我对它的看法......

Answer 1

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

所以，你在MyprogAppDelegate中的代码应该是这样的：

@implementation MyprogAppDelegate
@synthesize ...;

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


    return YES;
}

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

}

Answer 2

编辑好的，整个第一个答案已被抛弃。这有一些警告，在黑暗中仍然有点像一个镜头，但我认为这将更接近有用。虽然有些想法可以继续下去。

您很可能不需要单独的课程来充当您的ABPeoplePickerNavigationControllerDelegate。很可能，它应该是同一个类，底部有你的代码（调用presentModalViewController:animated:。因为我不知道那是什么控制器，所以我只打电话给它MyViewController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态视图控制器。
您肯定不希望您的计划UIApplicationDelegate成为ABPeoplePickerNavigationControllerDelegate。正如您自己所说，peoplePickerDelegate必须是UIViewController。

所以，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（如表视图控制器或类似的东西） - 不应更改，唯一应该更改的是将ABPeoplePickerNavigationControllerDelegate添加到已实现的协议列表中

现在，实现功能：

/* 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

Answer 3

最后，我无法按照预期执行上述任何建议。我不得不缩短时间并继续前进，所以我在每个视图中复制了代码。我将在另一次重新审视，因为我确信它可以基于更加基于对象的方式完成，而不是我结束它。

为什么peoplePickerDelegate没有得到委托的地址吧？

3 个答案: