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diff --git a/AuthSamples/Sample/UIViewController+Alerts.h b/AuthSamples/Sample/UIViewController+Alerts.h
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+/*
+ * Copyright 2017 Google
+ *
+ * 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 <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+/*! @typedef AlertPromptCompletionBlock
+    @brief The type of callback used to report text input prompt results.
+ */
+typedef void (^AlertPromptCompletionBlock)(BOOL userPressedOK, NSString *_Nullable userInput);
+
+/*! @class Alerts
+    @brief Wrapper for @c UIAlertController and @c UIAlertView for backwards compatability with
+        iOS 6+.
+ */
+@interface UIViewController (Alerts)
+
+/*! @property useStatusBarSpinner
+    @brief Uses the status bar to indicate work is occuring instead of a modal "please wait" dialog.
+        This is generally useful for allowing user interaction while things are happening.
+ */
+@property(nonatomic, assign) BOOL useStatusBarSpinner;
+
+/*! @fn showMessagePrompt:
+    @brief Displays an alert with an 'OK' button and a message.
+    @param message The message to display.
+    @remarks The message is also copied to the pasteboard.
+ */
+- (void)showMessagePrompt:(NSString *)message;
+
+/*! @fn showMessagePromptWithTitle:message:
+    @brief Displays a titled alert with an 'OK' button and a message.
+    @param title The title of the alert if it exists.
+    @param message The message to display.
+    @param showCancelButton A flag indicating whether or not a cancel option is available.
+    @param completion The completion block to be executed after the alert is dismissed, if it
+        exists.
+    @remarks The message is also copied to the pasteboard.
+ */
+- (void)showMessagePromptWithTitle:(nullable NSString *)title
+                           message:(NSString *)message
+                  showCancelButton:(BOOL)showCancelButton
+                        completion:(nullable AlertPromptCompletionBlock)completion;
+
+/*! @fn showTextInputPromptWithMessage:keyboardType:completionBlock:
+    @brief Shows a prompt with a text field and 'OK'/'Cancel' buttons.
+    @param message The message to display.
+    @param keyboardType The type of keyboard to display for the UITextView in the prompt.
+    @param completion A block to call when the user taps 'OK' or 'Cancel'.
+ */
+- (void)showTextInputPromptWithMessage:(NSString *)message
+                          keyboardType:(UIKeyboardType)keyboardType
+                       completionBlock:(AlertPromptCompletionBlock)completion;
+
+/*! @fn showTextInputPromptWithMessage:completionBlock:
+    @brief Shows a prompt with a text field and 'OK'/'Cancel' buttons.
+    @param message The message to display.
+    @param completion A block to call when the user taps 'OK' or 'Cancel'.
+ */
+- (void)showTextInputPromptWithMessage:(NSString *)message
+                       completionBlock:(AlertPromptCompletionBlock)completion;
+
+/*! @fn showSpinner
+    @brief Shows the please wait spinner.
+    @param completion Called after the spinner has been hidden.
+ */
+- (void)showSpinner:(nullable void(^)(void))completion;
+
+/*! @fn hideSpinner
+    @brief Hides the please wait spinner.
+    @param completion Called after the spinner has been hidden.
+ */
+- (void)hideSpinner:(nullable void(^)(void))completion;
+
+@end
+
+NS_ASSUME_NONNULL_END