SP1.2: Invite to Space in room landing element-ios#5225

- Update after review

Riot/Modules/Room/ParticipantsInviteModal/ContactsPicker/ContactsPickerViewModelProtocol.swift

@@ -0,0 +1,34 @@
+// 
+// Copyright 2021 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+
+protocol ContactsPickerViewModelCoordinatorDelegate: AnyObject {
+    func contactsPickerViewModelDidStartLoading(_ viewModel: ContactsPickerViewModelProtocol)
+    func contactsPickerViewModelDidEndLoading(_ viewModel: ContactsPickerViewModelProtocol)
+    func contactsPickerViewModelDidStartInvite(_ viewModel: ContactsPickerViewModelProtocol)
+    func contactsPickerViewModelDidEndInvite(_ viewModel: ContactsPickerViewModelProtocol)
+    func contactsPickerViewModel(_ viewModel: ContactsPickerViewModelProtocol, inviteFailedWithError error: Error?)
+    func contactsPickerViewModel(_ viewModel: ContactsPickerViewModelProtocol, display message: String, title: String, actions: [UIAlertAction])
+}
+
+protocol ContactsPickerViewModelProtocol {
+    var coordinatorDelegate: ContactsPickerViewModelCoordinatorDelegate? { get set }
+    var areParticipantsLoaded: Bool { get }
+    
+    func loadParticipants()
+    @discardableResult func prepare(contactsViewController: RoomInviteViewController, currentSearchText: String?) -> Bool
+}