4850 bring leaving space experience in line with web (#6062)

* Bring leaving space experience in line with Web #4850

- Done

RiotSwiftUI/Modules/Spaces/LeaveSpace/View/LeaveSpace.swift

@@ -0,0 +1,58 @@
+// 
+// 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 SwiftUI
+
+@available(iOS 14.0, *)
+struct LeaveSpace: View {
+    
+    // MARK: Properties
+    
+    @ObservedObject var viewModel: MatrixItemChooserViewModel.Context
+    let navTitle: String?
+    
+    // MARK: Private
+    
+    @Environment(\.theme) private var theme: ThemeSwiftUI
+    
+    @ViewBuilder
+    var body: some View {
+        mainView
+            .background(theme.colors.background)
+    }
+    
+    // MARK: - Private
+
+    @ViewBuilder
+    private var mainView: some View {
+        ZStack(alignment: .bottom) {
+            MatrixItemChooser(viewModel: viewModel, listBottomPadding: 72)
+            footerView
+        }
+    }
+    
+    @ViewBuilder
+    private var footerView: some View {
+        Button {
+            viewModel.send(viewAction: .done)
+        } label: {
+            Text(viewModel.viewState.selectedItemIds.isEmpty ? VectorL10n.leaveSpaceAction : (viewModel.viewState.selectedItemIds.count == 1 ? VectorL10n.leaveSpaceAndOneRoom : VectorL10n.leaveSpaceAndMoreRooms("\(viewModel.viewState.selectedItemIds.count)")))
+        }
+        .buttonStyle(PrimaryActionButtonStyle(customColor: theme.colors.alert))
+        .padding()
+    }
+
+}