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diff --git a/examples/objective-c/route_guide/ViewControllers.m b/examples/objective-c/route_guide/ViewControllers.m
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+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * 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/UIKit.h>
+#import <RouteGuide/RouteGuide.pbrpc.h>
+#import <RxLibrary/GRXWriter+Immediate.h>
+#import <RxLibrary/GRXWriter+Transformations.h>
+
+static NSString * const kHostAddress = @"http://localhost:50051";
+
+// Category to override RTGPoint's description.
+@interface RTGPoint (Description)
+- (NSString *)description;
+@end
+
+@implementation RTGPoint (Description)
+- (NSString *)description {
+  NSString *verticalDirection = self.latitude >= 0 ? @"N" : @"S";
+  NSString *horizontalDirection = self.longitude >= 0 ? @"E" : @"W";
+  return [NSString stringWithFormat:@"%.02f%@ %.02f%@",
+          abs(self.latitude) / 1E7f, verticalDirection,
+          abs(self.longitude) / 1E7f, horizontalDirection];
+}
+@end
+
+// Category to give RTGRouteNote a convenience constructor.
+@interface RTGRouteNote (Constructors)
++ (instancetype)noteWithMessage:(NSString *)message
+                       latitude:(float)latitude
+                      longitude:(float)longitude;
+@end
+
+@implementation RTGRouteNote (Constructors)
++ (instancetype)noteWithMessage:(NSString *)message
+                       latitude:(float)latitude
+                      longitude:(float)longitude {
+  RTGRouteNote *note = [self message];
+  note.message = message;
+  note.location.latitude = (int32_t) latitude * 1E7;
+  note.location.longitude = (int32_t) longitude * 1E7;
+  return note;
+}
+@end
+
+
+#pragma mark Demo: Get Feature
+
+// Run the getFeature demo. Calls getFeature with a point known to have a feature and a point known
+// not to have a feature.
+
+@interface GetFeatureViewController : UIViewController
+@end
+
+@implementation GetFeatureViewController
+
+- (void)viewDidLoad {
+  [super viewDidLoad];
+
+  RTGRouteGuide *client = [[RTGRouteGuide alloc] initWithHost:kHostAddress];
+
+  void (^handler)(RTGFeature *response, NSError *error) = ^(RTGFeature *response, NSError *error) {
+    if (response.name.length) {
+      NSLog(@"Found feature called %@ at %@.", response.name, response.location);
+    } else if (response) {
+      NSLog(@"Found no features at %@", response.location);
+    } else {
+      NSLog(@"RPC error: %@", error);
+    }
+  };
+
+  RTGPoint *point = [RTGPoint message];
+  point.latitude = 409146138;
+  point.longitude = -746188906;
+
+  [client getFeatureWithRequest:point handler:handler];
+  [client getFeatureWithRequest:[RTGPoint message] handler:handler];
+}
+
+@end
+
+
+#pragma mark Demo: List Features
+
+// Run the listFeatures demo. Calls listFeatures with a rectangle containing all of the features in
+// the pre-generated database. Prints each response as it comes in.
+
+@interface ListFeaturesViewController : UIViewController
+@end
+
+@implementation ListFeaturesViewController
+
+- (void)viewDidLoad {
+  [super viewDidLoad];
+
+  RTGRouteGuide *client = [[RTGRouteGuide alloc] initWithHost:kHostAddress];
+
+  RTGRectangle *rectangle = [RTGRectangle message];
+  rectangle.lo.latitude = 405E6;
+  rectangle.lo.longitude = -750E6;
+  rectangle.hi.latitude = 410E6;
+  rectangle.hi.longitude = -745E6;
+
+  NSLog(@"Looking for features between %@ and %@", rectangle.lo, rectangle.hi);
+  [client listFeaturesWithRequest:rectangle
+                     eventHandler:^(BOOL done, RTGFeature *response, NSError *error) {
+    if (response) {
+      NSLog(@"Found feature at %@ called %@.", response.location, response.name);
+    } else if (error) {
+      NSLog(@"RPC error: %@", error);
+    }
+  }];
+}
+
+@end
+
+
+#pragma mark Demo: Record Route
+
+// Run the recordRoute demo. Sends several randomly chosen points from the pre-generated feature
+// database with a variable delay in between. Prints the statistics when they are sent from the
+// server.
+
+@interface RecordRouteViewController : UIViewController
+@end
+
+@implementation RecordRouteViewController
+
+- (void)viewDidLoad {
+  [super viewDidLoad];
+
+  NSString *dataBasePath = [NSBundle.mainBundle pathForResource:@"route_guide_db"
+                                                         ofType:@"json"];
+  NSData *dataBaseContent = [NSData dataWithContentsOfFile:dataBasePath];
+  NSArray *features = [NSJSONSerialization JSONObjectWithData:dataBaseContent options:0 error:NULL];
+
+  GRXWriter *locations = [[GRXWriter writerWithContainer:features] map:^id(id feature) {
+    RTGPoint *location = [RTGPoint message];
+    location.longitude = [((NSNumber *) feature[@"location"][@"longitude"]) intValue];
+    location.latitude = [((NSNumber *) feature[@"location"][@"latitude"]) intValue];
+    NSLog(@"Visiting point %@", location);
+    return location;
+  }];
+
+  RTGRouteGuide *client = [[RTGRouteGuide alloc] initWithHost:kHostAddress];
+
+  [client recordRouteWithRequestsWriter:locations handler:^(RTGRouteSummary *response, NSError *error) {
+    if (response) {
+      NSLog(@"Finished trip with %i points", response.pointCount);
+      NSLog(@"Passed %i features", response.featureCount);
+      NSLog(@"Travelled %i meters", response.distance);
+      NSLog(@"It took %i seconds", response.elapsedTime);
+    } else {
+      NSLog(@"RPC error: %@", error);
+    }
+  }];
+}
+
+@end
+
+
+#pragma mark Demo: Route Chat
+
+// Run the routeChat demo. Send some chat messages, and print any chat messages that are sent from
+// the server.
+
+@interface RouteChatViewController : UIViewController
+@end
+
+@implementation RouteChatViewController
+
+- (void)viewDidLoad {
+  [super viewDidLoad];
+
+  NSArray *notes = @[[RTGRouteNote noteWithMessage:@"First message" latitude:0 longitude:0],
+                     [RTGRouteNote noteWithMessage:@"Second message" latitude:0 longitude:1],
+                     [RTGRouteNote noteWithMessage:@"Third message" latitude:1 longitude:0],
+                     [RTGRouteNote noteWithMessage:@"Fourth message" latitude:0 longitude:0]];
+  GRXWriter *notesWriter = [[GRXWriter writerWithContainer:notes] map:^id(RTGRouteNote *note) {
+    NSLog(@"Sending message %@ at %@", note.message, note.location);
+    return note;
+  }];
+
+  RTGRouteGuide *client = [[RTGRouteGuide alloc] initWithHost:kHostAddress];
+
+  [client routeChatWithRequestsWriter:notesWriter
+                         eventHandler:^(BOOL done, RTGRouteNote *note, NSError *error) {
+    if (note) {
+      NSLog(@"Got message %@ at %@", note.message, note.location);
+    } else if (error) {
+      NSLog(@"RPC error: %@", error);
+    }
+    if (done) {
+      NSLog(@"Chat ended.");
+    }
+  }];
+}
+
+@end