Check if User is Logged into iCloud? Swift/iOS

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.

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")
    }
}