Add extension for UIAlertController to present Errors

1 files changed, 52 insertions, 0 deletions

diff --git a/ios/MullvadVPN/UIAlertController+Error.swift b/ios/MullvadVPN/UIAlertController+Error.swift
new file mode 100644
index 0000000000..b76958b0ef
--- /dev/null
+++ b/ios/MullvadVPN/UIAlertController+Error.swift
@@ -0,0 +1,52 @@
+//
+//  UIAlertController+Error.swift
+//  MullvadVPN
+//
+//  Created by pronebird on 11/12/2019.
+//  Copyright © 2019 Amagicom AB. All rights reserved.
+//
+
+import Foundation
+import UIKit
+
+/// An extension for presenting `LocalizedError` subclasses in `UIAlertController`
+extension UIAlertController {
+
+    convenience init<Error>(_ error: Error, preferredStyle: UIAlertController.Style)
+        where Error: LocalizedError
+    {
+        let title = error.errorDescription
+        let message = [error.failureReason, error.recoverySuggestion]
+            .compactMap { $0 }
+            .joined(separator: "\n\n")
+
+        self.init(title: title, message: message, preferredStyle: preferredStyle)
+    }
+
+}
+
+extension UIViewController {
+
+    /// Present an instance of `LocalizedError` using `UIAlertController`
+    /// Note: this method adds a default "OK" action when `configurationBlock` is not given
+    func presentError<Error>(
+        _ error: Error,
+        preferredStyle: UIAlertController.Style,
+        configurationBlock: ((UIAlertController) -> Void)? = nil,
+        completionBlock: (() -> Void)? = nil)
+        where Error: LocalizedError
+    {
+        let alertController = UIAlertController(error, preferredStyle: preferredStyle)
+
+        if let configurationBlock = configurationBlock {
+            configurationBlock(alertController)
+        } else {
+            alertController.addAction(
+                UIAlertAction(title: NSLocalizedString("OK", comment: ""), style: .cancel)
+            )
+        }
+
+        self.present(alertController, animated: true, completion: completionBlock)
+    }
+
+}