iOS: Migrate to Swift

This is in preparation for moving to SwiftUI at some point.

iOS/AddSiteController.swift

@@ -0,0 +1,118 @@
+/*
+ * Copyright (c) 2016 - 2019 Jonathan Schleifer <js@heap.zone>
+ *
+ * https://heap.zone/git/scrypt-pwgen.git
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice is present in all copies.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+import UIKit
+import ObjFW
+import ObjFW_Bridge
+
+class AddSiteController: UITableViewController {
+    @IBOutlet var nameField: UITextField?
+    @IBOutlet var lengthField: UITextField?
+    @IBOutlet var legacySwitch: UISwitch?
+    public var keyFile: String?
+    @IBOutlet var keyFileLabel: UILabel?
+    public var mainViewController: MainViewController?
+
+    override func tableView(_ tableView: UITableView,
+                            didSelectRowAt indexPath: IndexPath) {
+        tableView.deselectRow(at: indexPath, animated: true)
+
+        if indexPath.section == 1 && indexPath.row == 1 {
+            self.performSegue(withIdentifier: "selectKeyFile", sender: self)
+        }
+    }
+
+    override func tableView(
+        _ tableView: UITableView,
+        willSelectRowAt indexPath: IndexPath
+    ) -> IndexPath? {
+        if indexPath.section == 1 && indexPath.row == 1 {
+            return indexPath
+        }
+
+        return nil
+    }
+
+    private func showAlert(controller: UIViewController, title: String,
+                           message: String) {
+        let alert = UIAlertController(title: title, message: message,
+                                      preferredStyle: .alert)
+        alert.addAction(
+            UIAlertAction(title: "OK", style: .default, handler: nil))
+        controller.present(alert, animated: true, completion: nil)
+    }
+
+    @IBAction func done(_ sender: Any) {
+        guard let name = nameField?.text?.ofObject else { return }
+        guard let lengthString = lengthField?.text?.ofObject else { return }
+
+        guard name.length > 0 else {
+            showAlert(controller: self, title: "Name missing",
+                      message: "Please enter a name.")
+            return
+        }
+
+        var lengthValid = true
+        var length: size_t = 0
+        OFException.try({
+            length = lengthString.decimalValue
+
+            if length < 3 || length > 64 {
+                lengthValid = false
+            }
+        }, catch: { (OFException) in
+            lengthValid = false
+        })
+
+        guard lengthValid else {
+            showAlert(controller: self, title: "Invalid length",
+                      message: "Please enter a number between 3 and 64.")
+            return
+        }
+
+        guard let siteStorage = mainViewController?.siteStorage else { return }
+
+        guard !siteStorage.hasSite(name) else {
+            showAlert(controller: self, title: "Site Already Exists",
+                      message: "Please pick a name that does not exist yet.")
+            return
+        }
+
+        let keyFile = self.keyFile?.ofObject
+        siteStorage.setSite(name, length: length,
+                            legacy: legacySwitch?.isOn ?? false,
+                            keyFile: keyFile)
+        mainViewController?.reset()
+        navigationController?.popViewController(animated: true)
+    }
+
+    @IBAction func cancel(_ sender: Any) {
+        navigationController?.popViewController(animated: true)
+    }
+
+    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
+        if segue.identifier == "selectKeyFile" {
+            let controller = segue.destination as? SelectKeyFileController
+            controller?.addSiteController = self
+        }
+    }
+}