在iOS中访问地址簿时出错＆lt; 6

Question

我已经实施了获取联系人的方法。

对于iOS 6，我使用以下代码获取用户的许可：

CFErrorRef myError = NULL;
ABAddressBookRef myAddressBook = ABAddressBookCreateWithOptions(NULL, &myError);
ABAddressBookRequestAccessWithCompletion(myAddressBook,^(bool granted, CFErrorRef error)
{
   if(granted)
    {
        [self GetContactInformation];
    }
   else
    {
        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Contacts" message:@"You didn't permit us to access your contact details." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];
        [alert show];
        [alert release];
    }
});
CFRelease(myAddressBook);

以上代码在iOS 6中工作正常，但在iOS 6以下我收到以下错误：

Answer 1

您可以使用MACROS对此进行过滤：

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 60000
CFErrorRef myError = NULL;
ABAddressBookRef myAddressBook = ABAddressBookCreateWithOptions(NULL, &myError);
ABAddressBookRequestAccessWithCompletion(myAddressBook,^(bool granted, CFErrorRef error)
{
   if(granted)
    {
        [self GetContactInformation];
    }
   else
    {
        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Contacts" message:@"You didn't permit us to access your contact details." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];
        [alert show];
        [alert release];
    }
});
CFRelease(myAddressBook); 
#else
    [self GetContactInformation];
#endif

告诉我们是否有效。

Answer 2

好吧，看来你已经知道了答案。这两个功能都是iOS 6+ 仅 ，并且在以前的SDK中不存在，这意味着它们的符号未定义。您必须编码为最低公分母，或将目标提升至iOS 6。