用xcode 5 开发访问IOS 7上面的通讯录有问题

NSMutableArray *addressBookTemp = [NSMutableArray array];

ABAddressBookRef addressBooks = ABAddressBookCreate();

CFArrayRef allPeople = ABAddressBookCopyArrayOfAllPeople(addressBooks);

CFIndex nPeople = ABAddressBookGetPersonCount(addressBooks);

这段代码在IOS6是可以读取通讯录的，但在IOS7下面就不行，程序没报错，调试时候发现返回的都是nil，有木有朋友遇到这个问题？

找到原因了，原来IOS7需要隐私验证，调用通讯录里面API需要以下代码作为权限认证：

    __block BOOL accessGranted = NO;
    if (ABAddressBookGetAuthorizationStatus() == kABAuthorizationStatusNotDetermined)
    { ABAddressBookRequestAccessWithCompletion(addressBooks, ^(bool granted, CFErrorRef error)
        {
            // First time access has been granted, add the contact accessGranted = granted;
        });
    }
    else if (ABAddressBookGetAuthorizationStatus() == kABAuthorizationStatusAuthorized)
    {
        // The user has previously given access, add the contact accessGranted = YES;
    }
    else
    {
        // The user has previously denied access // Send an alert telling user to change privacy setting in settings app
    }