Add search to send-contact-list (#2209)

deltachat-ios/Chat/Send Contact/SendContactViewController.swift

@@ -9,18 +9,33 @@ class SendContactViewController: UIViewController {
 
     private let context: DcContext
     private let contactIds: [Int]
+    private var filteredContactIds: [Int]
 
     let tableView: UITableView
 
     var delegate: SendContactViewControllerDelegate?
+    let searchController: UISearchController
+    let emptySearchStateLabel: EmptyStateLabel
+    private var emptySearchStateLabelWidthConstraint: NSLayoutConstraint?
 
     init(dcContext: DcContext) {
         tableView = UITableView()
         tableView.translatesAutoresizingMaskIntoConstraints = false
         tableView.register(ContactCell.self, forCellReuseIdentifier: ContactCell.reuseIdentifier)
+        tableView.keyboardDismissMode = .onDrag
 
         context = dcContext
         contactIds = dcContext.getContacts(flags: DC_GCL_ADD_SELF)
+        filteredContactIds = contactIds
+
+        searchController = UISearchController(searchResultsController: nil)
+        searchController.obscuresBackgroundDuringPresentation = false
+        searchController.searchBar.placeholder = String.localized("search")
+        searchController.searchBar.showsCancelButton = false
+        searchController.hidesNavigationBarDuringPresentation = false
+
+        emptySearchStateLabel = EmptyStateLabel()
+        emptySearchStateLabel.isHidden = true
 
         super.init(nibName: nil, bundle: nil)
 
@@ -33,6 +48,10 @@ class SendContactViewController: UIViewController {
 
         let cancelButton = UIBarButtonItem(barButtonSystemItem: .cancel, target: self, action: #selector(SendContactViewController.cancel(_:)))
         navigationItem.rightBarButtonItem = cancelButton
+
+        searchController.searchResultsUpdater = self
+        navigationItem.searchController = searchController
+        navigationItem.hidesSearchBarWhenScrolling = false
     }
 
     required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") }
@@ -45,39 +64,84 @@ class SendContactViewController: UIViewController {
             view.bottomAnchor.constraint(equalTo: tableView.bottomAnchor),
         ]
 
+        emptySearchStateLabelWidthConstraint = emptySearchStateLabel.widthAnchor.constraint(equalTo: tableView.widthAnchor)
+
         NSLayoutConstraint.activate(constraints)
     }
 
     // MARK: - Actions
 
     @objc func cancel(_ sender: Any) {
+        searchController.isActive = false
         dismiss(animated: true)
     }
 }
 
+// MARK: - UITableViewDelegate
 extension SendContactViewController: UITableViewDelegate {
     func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
         tableView.deselectRow(at: indexPath, animated: true)
 
-        let contactId = contactIds[indexPath.row]
+        let contactId = filteredContactIds[indexPath.row]
         delegate?.contactSelected(self, contactId: contactId)
 
+        searchController.isActive = false
         dismiss(animated: true)
     }
 }
 
+// MARK: - UITableViewDataSource
 extension SendContactViewController: UITableViewDataSource {
     func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
-        return contactIds.count
+        return filteredContactIds.count
     }
 
     func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
         guard let cell = tableView.dequeueReusableCell(withIdentifier: ContactCell.reuseIdentifier, for: indexPath) as? ContactCell else { fatalError("Where's my ContactCell??") }
 
-        let contactId = contactIds[indexPath.row]
+        let contactId = filteredContactIds[indexPath.row]
         let viewModel = ContactCellViewModel.make(contactId: contactId, dcContext: context)
         cell.updateCell(cellViewModel: viewModel)
 
         return cell
     }
 }
+
+// MARK: - UISearchResultsUpdating
+extension SendContactViewController: UISearchResultsUpdating {
+    func updateSearchResults(for searchController: UISearchController) {
+        guard let searchText = searchController.searchBar.text else {
+            filteredContactIds = contactIds
+            return
+        }
+
+        filterContentForSearchText(searchText)
+    }
+
+    private func filterContentForSearchText(_ searchText: String) {
+        filteredContactIds = filterContactIds(queryString: searchText)
+        tableView.reloadData()
+        tableView.scrollToTop()
+
+        // handle empty searchstate
+        if searchController.isActive && filteredContactIds.isEmpty {
+            let text = String.localizedStringWithFormat(
+                String.localized("search_no_result_for_x"),
+                searchText
+            )
+            emptySearchStateLabel.text = text
+            emptySearchStateLabel.isHidden = false
+            tableView.tableHeaderView = emptySearchStateLabel
+            emptySearchStateLabelWidthConstraint?.isActive = true
+        } else {
+            emptySearchStateLabel.text = nil
+            emptySearchStateLabel.isHidden = true
+            emptySearchStateLabelWidthConstraint?.isActive = false
+            tableView.tableHeaderView = nil
+        }
+    }
+
+    private func filterContactIds(queryString: String) -> [Int] {
+        return context.getContacts(flags: DC_GCL_ADD_SELF, queryString: queryString)
+    }
+}