prompt implemented for iOS

ui/dialogs/dialogs.d.ts

@@ -27,14 +27,19 @@
     /**
     * The prompt() method displays a dialog box that prompts the visitor for input.
     * @param text The text to display in the dialog box.
-    * @param defaultText The default input value.
     */
     function prompt(text: string, defaultText?: string): void;
 
+    /**
+    * The prompt() method displays a dialog box that prompts the visitor for input.
+    * @param options The options for the dialog box.
+    */
+    function prompt(options: PromptOptions): void;
+
     /**
     * Provides options for the alert.
     */
-    interface AlertOptions {
+    interface DialogOptions {
         /**
           * Gets or sets the alert message.
           */
@@ -44,7 +49,12 @@
           * Gets or sets the alert title.
           */
         title?: string;
+    }
 
+    /**
+    * Provides options for the alert.
+    */
+    interface AlertOptions extends DialogOptions {
         /**
           * Gets or sets the button name.
           */
@@ -54,17 +64,7 @@
     /**
     * Provides options for the alert.
     */
-    interface ConfirmOptions {
+    interface ConfirmOptions extends DialogOptions {
-        /**
-          * Gets or sets the alert message.
-          */
-        message: string;
-
-        /**
-          * Gets or sets the alert title.
-          */
-        title?: string;
-
         /**
           * Gets or sets the OK button name.
           */
@@ -75,4 +75,14 @@
           */
         cancelButtonName?: string;
     }
+
+    /**
+    * Provides options for the alert.
+    */
+    interface PromptOptions extends ConfirmOptions {
+        /**
+          * Gets or sets the default text.
+          */
+        defaultText?: string;
+    }
 }

ui/dialogs/dialogs.ios.ts

@@ -76,6 +76,35 @@ export function confirm(arg: any): promises.Promise<boolean> {
     return d.promise();
 }
 
-export function prompt(text: string, defaultText?: string): void {
+export function prompt(arg: any): promises.Promise<string> {
+    var d = promises.defer<string>();
+    try {
+        var options = typeof arg === "string" ? { message: arg, title: "Alert", okButtonName: "OK", cancelButtonName: "Cancel" } : arg
 
+        var alert = createUIAlertView(options);
+        alert.alertViewStyle = UIKit.UIAlertViewStyle.UIAlertViewStylePlainTextInput;
+        alert.addButtonWithTitle(options.okButtonName);
+        alert.addButtonWithTitle(options.cancelButtonName);
+
+        var textField = alert.textFieldAtIndex(0);
+        textField.text = options.defaultText ? options.defaultText : "";
+
+        // Assign first to local variable, otherwise it will be garbage collected since delegate is weak reference.
+        var delegate = createDelegate(function (view, index) {
+            if (index === 0) {
+                d.resolve(textField.text);
+            }
+            // Remove the local variable for the delegate.
+            delegate = undefined;
+        });
+
+        alert.delegate = delegate;
+
+        alert.show();
+
+    } catch (ex) {
+        d.reject(ex);
+    }
+
+    return d.promise();
 }