ios提示通讯录授权

ABAddressBookRef addressBook;　　

    if ([[UIDevice currentDevice].systemVersion floatValue] >= 6.0)    {       

        addressBook = ABAddressBookCreateWithOptions(NULL, NULL);

        //等待同意后向下执行

        dispatch_semaphore_t sema = dispatch_semaphore_create(0);       

      ABAddressBookRequestAccessWithCompletion(addressBook, ^(bool granted, CFErrorRef error)                                                

     {                                                    

         dispatch_semaphore_signal(sema);                                                

    });

        dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);         dispatch_release(sema);

    }else{

        addressBook = ABAddressBookCreate();    

   }

     NSArray* tmpPeoples = (NSArray*)ABAddressBookCopyArrayOfAllPeople(addressBook);

    NSLog(@"peoples.count=%d",tmpPeoples.count);