爲什麼peoplePickerDelegate沒有獲得代表的地址？

Question

這種情況是我有多個想要調用地址簿的視圖。爲了不在每個視圖中重複委託的代碼，我在App Delegate的頭文件和.m文件中找到了代碼，但是在2個相應的應用程序的底部使用了「@interface AddressBookDelegate」和「@implementation AddressBookDelegate」代表fiies-

@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; 
} 

然後在我的意見，我有以下代碼：

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

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

通訊簿顯示在所有視圖罰款。但是，當我採取會調用代表用戶進行任何操作，如地址簿中的取消按鈕，我crash-

- [MyprogAppDelegate peoplePickerNavigationControllerDidCancel：]：無法識別的選擇發送到實例

它編譯乾淨，沒有警告。

如何連接PeoplePickerDelegate以連接到地址委託代碼，當它與物理視圖本身不在同一個文件中時？謝謝。

補充說明：當我使用調試器和停止在視圖代碼行

abPicker.peoplePickerDelegate = addressBookDelegate; 

，我看到地址addressBookDelegate據稱是MyprogAppDelegate的地址，而不是AddressBookDelegate作爲我可能會預料到的。這使我認爲在App Delegate文件中關閉了地址簿委託代碼的位移。

如果AddressBookDelegate取消委託代碼被稱爲AddressBookDelegate 1000字節，我的應用程序實際上是「輸入」1000字節代碼到MyprogAppDelegate，並因此崩潰。所以不知何故，我沒有正確設置AddressBookDelegate的地址。這是我反正...

Answer 1

最後，我無法作出希望任何的上述建議執行。我不得不縮短時間，繼續前進，以便在每個視圖中複製代碼。我會再次回顧一下，因爲我確信它可以以更基於對象的方式完成，而不是我完成它。

Answer 2

您的代碼假定您的appdelegate（MyprogAppDelegate）實現方法peoplePickerNavigationControllerDidCancel。

所以，你在MyprogAppDelegate代碼應該是這樣的：

@implementation MyprogAppDelegate 
@synthesize ...; 

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


    return YES; 
} 

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

} 

Answer 3

編輯好了，整個第一個答案已經拋出了。這有一些警告，在黑暗中仍然有點不足，但我認爲這將會更有幫助。一些想法確實繼續下去。

1. 你很可能不需要單獨的類作爲您ABPeoplePickerNavigationControllerDelegate。很可能，它應該是同一個類，它的代碼位於底部（調用presentModalViewController:animated:。因爲我不知道那個控制器是什麼，所以我將其稱爲MyViewController以供參考。視圖控制器成爲委託是因爲，在您的委託方法中，您需要能夠關閉具有地址簿的模式視圖控制器。

2. 你肯定不希望你的程序的UIApplicationDelegate是ABPeoplePickerNavigationControllerDelegate。正如你自己所說，peoplePickerDelegate必須是UIViewController。

所以，到MyViewController。首先，接口：

/* MyViewController.h */ 

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

你的控制器可以從UIViewController中的後裔（如表視圖控制器或類似的東西）繼承 - 這不應該改變，應該改變的是加入ABPeoplePickerNavigationControllerDelegate的唯一實施的協議列表。

現在，要實現的功能：

/* 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