Sharing on Facebook, Twitter and Google+

[FIXED]     Font of navbar.
[FIXED]     A few compile fixes.
[IMPROVED]  Made properties nonatomic.
[ADDED]     Support for facebook, twitter and google+ sharing.

External/google-plus-ios-sdk/SampleCode/GooglePlusSampleAppDelegate.m

@@ -0,0 +1,89 @@
+//
+//  GooglePlusSampleAppDelegate.m
+//
+//  Copyright 2012 Google Inc.
+//
+//  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 "GooglePlusSampleAppDelegate.h"
+
+#import "GooglePlusSampleMasterViewController.h"
+#import "GooglePlusSignIn.h"
+#import "GooglePlusSignInButton.h"
+
+@implementation GooglePlusSampleAppDelegate
+
+@synthesize window = window_;
+@synthesize navigationController = navigationController_;
+@synthesize signInButton = signInButton_;
+@synthesize auth = auth_;
+@synthesize share = share_;
+
+// DO NOT USE THIS CLIENT ID. IT WILL NOT WORK FOR YOUR APP.
+// Please use the client ID created for you by Google.
+static NSString * const kClientID = @"571459971810-"
+    @"2bpoda566pap5kkc0aqljqfjki8tgeb6.apps.googleusercontent.com";
+
++ (NSString *)clientID {
+  return kClientID;
+}
+
+#pragma mark Object life-cycle.
+
+- (void)dealloc {
+  [window_ release];
+  [navigationController_ release];
+  [signInButton_ release];
+  [auth_ release];
+  [share_ release];
+  [super dealloc];
+}
+
+- (BOOL)application:(UIApplication *)application
+    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+  self.window = [[[UIWindow alloc]
+      initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
+  GooglePlusSampleMasterViewController *masterViewController =
+      [[[GooglePlusSampleMasterViewController alloc]
+          initWithNibName:@"GooglePlusSampleMasterViewController"
+                   bundle:nil] autorelease];
+  self.navigationController =
+      [[[UINavigationController alloc]
+          initWithRootViewController:masterViewController] autorelease];
+  self.window.rootViewController = self.navigationController;
+  [self.window makeKeyAndVisible];
+  return YES;
+}
+
+- (BOOL)application:(UIApplication *)application
+              openURL:(NSURL *)url
+    sourceApplication:(NSString *)sourceApplication
+           annotation:(id)annotation {
+  // Handle Google+ share dialog URL.
+  if ([share_ handleURL:url
+      sourceApplication:sourceApplication
+             annotation:annotation]) {
+    return YES;
+  }
+
+  // Handle Google+ sign-in button URL.
+  if ([signInButton_ handleURL:url
+             sourceApplication:sourceApplication
+                    annotation:annotation]) {
+    return YES;
+  }
+  return NO;
+}
+
+@end