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Question

我正在嘗試使用預定義的方法從addressBook獲取更新

ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, NULL);
ABAddressBookRegisterExternalChangeCallback(addressBook, addressBookChanged, self);

void addressBookChanged(ABAddressBookRef addressBook, CFDictionaryRef info, void *context)
{
    NSLog(@"AddressBook Changed");
    [self getContactsFromAddressBook];
}

我正在調用ABAddressBookRegisterExternalChangeCallback(addressBook, addressBookChanged, self); 在我的application:didFinishLaunchingWithOptions ，然后我做回調方法，該c方法中如何使用self？ 如果無法使用對象，如何更新表格視圖？

Answer 1

您不能在該函數中直接使用self但是在注冊change回調時會將self作為上下文傳遞，因此它將作為參數傳遞給addressBookChanged函數。

void addressBookChanged(ABAddressBookRef addressBook, CFDictionaryRef info, void *context)
{
    NSLog(@"AddressBook Changed");
    YourClass *yourInstance = (__bridge YourClass *)(context)
    [yourInstance getContactsFromAddressBook];
}

更具體地講授您的課程-

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions  
{
    ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, NULL);
    ABAddressBookRegisterExternalChangeCallback(addressBook, addressBookChanged, self.wkListVC);     
    return YES; 
}

void addressBookChanged(ABAddressBookRef addressBook, CFDictionaryRef info, void *context) 
{     
    NSLog(@"AddressBook Changed");     
    wbkABViewControllerTableViewController *myVC = (__bridge wbkABViewControllerTableViewController *)context;
    [myVC getPersonOutOfAddressBook]; 
}

注冊更改回調時，請確保self.wkListVC不為nil。