swift - 如何使用 Swift 检索地址簿联系人？

Question

我不明白为什么我的代码不能用 Swift 编译。

我正在尝试转换这个 Objective-C 代码:

CFErrorRef error = NULL;
ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, &error);

  if (addressBook != nil) { 
    NSLog(@"Succesful."); 

    NSArray *allContacts = (__bridge_transfer NSArray *)ABAddressBookCopyArrayOfAllPeople(addressBook);
}

这是我目前在 Swift 中的演绎:

var error:CFErrorRef
var addressBook = ABAddressBookCreateWithOptions(nil, nil);

if (addressBook != nil) {
    println("Succesful.");

    var allContacts:CFArrayRef = ABAddressBookCopyArrayOfAllPeople(addressBook);
}

但是，Xcode 报告:

'Unmanaged' is not convertible to 'CFArrayRef'

你们有想法吗？

Answer 1

显然，如果针对 iOS 版本 9 或更高版本，则不应使用 AddressBook框架，而是使用 Contacts框架。

所以，

1. 导入 Contacts :

   import Contacts
   

2. 确保提供 NSContactsUsageDescription在你的Info.plist .

3. 然后，您就可以访问联系人了。例如。在 Swift 3 中:

   let status = CNContactStore.authorizationStatus(for: .contacts)
   if status == .denied || status == .restricted {
       presentSettingsActionSheet()
       return
   }
   
   // open it
   
   let store = CNContactStore()
   store.requestAccess(for: .contacts) { granted, error in
       guard granted else {
           DispatchQueue.main.async {
               self.presentSettingsActionSheet()
           }
           return
       }
   
       // get the contacts
   
       var contacts = [CNContact]()
       let request = CNContactFetchRequest(keysToFetch: [CNContactIdentifierKey as NSString, CNContactFormatter.descriptorForRequiredKeys(for: .fullName)])
       do {
           try store.enumerateContacts(with: request) { contact, stop in
               contacts.append(contact)
           }
       } catch {
           print(error)
       }
   
       // do something with the contacts array (e.g. print the names)
   
       let formatter = CNContactFormatter()
       formatter.style = .fullName
       for contact in contacts {
           print(formatter.string(from: contact) ?? "???")
       }
   }
   

   在哪里

   func presentSettingsActionSheet() {
       let alert = UIAlertController(title: "Permission to Contacts", message: "This app needs access to contacts in order to ...", preferredStyle: .actionSheet)
       alert.addAction(UIAlertAction(title: "Go to Settings", style: .default) { _ in
           let url = URL(string: UIApplication.openSettingsURLString)!
           UIApplication.shared.open(url)
       })
       alert.addAction(UIAlertAction(title: "Cancel", style: .cancel))
       present(alert, animated: true)
   }
   

我对 AddressBook 框架的原始回答如下。

---

一些观察:

• 如果你想使用error ABAddressBookCreateWithOptions 的参数, 定义为 Unmanaged<CFError>? .

• 如果失败，请查看错误对象(执行 takeRetainedValue 以免泄漏)。

• 确保takeRetainedValue通讯录也一样，所以你不会泄露。

• 您可能不应该只获取联系人，但您可能应该先请求许可。

把所有这些放在一起你会得到:

// make sure user hadn't previously denied access

let status = ABAddressBookGetAuthorizationStatus()
if status == .Denied || status == .Restricted {
    // user previously denied, so tell them to fix that in settings
    return
}

// open it

var error: Unmanaged<CFError>?
guard let addressBook: ABAddressBook? = ABAddressBookCreateWithOptions(nil, &error)?.takeRetainedValue() else {
    print(error?.takeRetainedValue())
    return
}

// request permission to use it

ABAddressBookRequestAccessWithCompletion(addressBook) { granted, error in
    if !granted {
        // warn the user that because they just denied permission, this functionality won't work
        // also let them know that they have to fix this in settings
        return
    }

    if let people = ABAddressBookCopyArrayOfAllPeople(addressBook)?.takeRetainedValue() as? NSArray {
        // now do something with the array of people
    }
}