ios - 在通讯录更新时收到通知

Question

我正在尝试从 addressBook 获取更新使用预定义的方法

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

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

我调用 ABAddressBookRegisterExternalChangeCallback(addressBook, addressBookChanged, self);在我的application:didFinishLaunchingWithOptions ，然后我做回调方法，如何在那个c方法中使用self？如果我不能使用我的对象，我该如何更新我的表格 View ？

Answer 1

不能直接使用self在该函数中-但是当您注册更改回调时，您将 self 作为上下文传递，因此它将作为 addressBookChanged 函数中的参数传递。

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

更具体到您的类(class) -

- (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]; 
}

注册更改回调时，请确保 self.wkListVC 不为零。