Check if User is Logged into iCloud? Swift/iOS

Question

Is there a way for me to check and see if a user is logged into iCloud when they open the app up? I want to be able to direct them to the settings page if they are not logged in, and if they are logged into iCloud and have used the app before - I want to skip the sign in page....

I looked into Apple's iCloud and Cloudkits documentation but was unable to find anything that would be of assistance! Is this even possible to do?

Answer 1

If you just want to know if the user is logged in to iCloud, the synchronous method can be used:

if FileManager.default.ubiquityIdentityToken != nil {
    print("iCloud Available")
} else {
    print("iCloud Unavailable")
}

If the ubiquityIdentityToken is nil and you'd like to know why iCloud isn't available, you can use the asynchronous method:

CKContainer.default().accountStatus { (accountStatus, error) in
    switch accountStatus {
    case .available:
        print("iCloud Available")
    case .noAccount:
        print("No iCloud account")
    case .restricted:
        print("iCloud restricted")
    case .couldNotDetermine:
        print("Unable to determine iCloud status")
    }
}

Note that this requires the use of CloudKit, which requires the CloudKit entitlement:

<key>com.apple.developer.icloud-services</key>
<array>
    <string>CloudKit</string>
</array>

If you want to use the asynchronous method but don't care about why, you should check that accountStatus is available, rather than checking that it is not noAccount:

CKContainer.default().accountStatus { (accountStatus, error) in
    if case .available = accountStatus {
        print("iCloud Available")
    } else {
        print("iCloud Unavailable")
    }
}

Answer 2

Here you go - hopefully self explanatory. For more look at the Apple docs for the NSFileManager function below.

func isICloudContainerAvailable()->Bool {
        if let currentToken = NSFileManager.defaultManager().ubiquityIdentityToken {
            return true
        }
        else {
            return false
        }
    }

See extract below: An opaque token that represents the current user’s iCloud identity (read-only) When iCloud is currently available, this property contains an opaque object representing the identity of the current user. If iCloud is unavailable for any reason or there is no logged-in user, the value of this property is nil.

Answer 3

I think this async method is preferred so that you don't block while you are checking.

        CKContainer.defaultContainer().accountStatusWithCompletionHandler { (accountStat, error) in
          if (accountStat == .Available) {
              print("iCloud is available")
          }
          else {
              print("iCloud is not available")
          }
        }

Answer 4

There are two methods for checking iCloud functionalities, which are provided for two different needs.

1. Checking for iCloudDrive availability
2. Checking for iCloud CKContainer availability

Checking for iCloudDrive availability

From Apples documentation:

FileManager.default.ubiquityIdentityToken -> An opaque token that represents the current user’s iCloud Drive Documents identity.

In iCloud Drive Documents, when iCloud is available, this property contains an opaque object representing the identity of the current user. If iCloud is unavailable or there is no logged-in user, the value of this property is nil.

To check for this iCloud functionality we can retrieve that token and check for nil.

// Request iCloud token
let token = FileManager.default.ubiquityIdentityToken
if token == nil {
    print("iCloud (Drive) is not available")
} else {
    print("iCloud (Drive) is available")
}

To assure beeing notified, if iCloudDrive availabilty changes during the app runs -> register to the NotificationCenter for NSUbiquityIdentityDidChange notification.

Checking for iCloud CKContainer availability

To check, wether the users iCloud account is available for accessing the CKContainer (and its private database), we can use an async request on the default container.

// Check iCloud account status (access to the apps private database)
CKContainer.default().accountStatus { (accountStatus, error) in

  if accountStatus == .available {
      print("iCloud app container and private database is available")
  } else {
      print("iCloud not available \(String(describing: error?.localizedDescription))")
  }   
}

To be informed about changes while the app is running, you can use the CKAccountChanged notification.

Answer 5

Here Solution for Swift 5.x

func isICloudContainerAvailable()->Bool {
    if let _ = FileManager.default.ubiquityIdentityToken {
            return true
    } else {
        return false
    }
}