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/GooglePlusSampleShareViewController.m

@@ -0,0 +1,145 @@
+//
+//  GooglePlusSampleShareViewController.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 "GooglePlusSampleShareViewController.h"
+
+#import "GooglePlusSampleAppDelegate.h"
+
+@implementation GooglePlusSampleShareViewController
+
+@synthesize sharePrefillText = sharePrefillText_;
+@synthesize shareURL = shareURL_;
+@synthesize shareStatus = shareStatus_;
+@synthesize shareToolbar = shareToolbar_;
+
+- (void)dealloc {
+  [sharePrefillText_ release];
+  [shareURL_ release];
+  [shareStatus_ release];
+  [share_ release];
+  [shareToolbar_ release];
+  [super dealloc];
+}
+
+#pragma mark - View lifecycle
+
+- (void)viewDidLoad {
+  // Set up Google+ share dialog.
+  GooglePlusSampleAppDelegate *appDelegate = (GooglePlusSampleAppDelegate *)
+      [[UIApplication sharedApplication] delegate];
+  NSString *clientID = [GooglePlusSampleAppDelegate clientID];
+  share_ = [[GooglePlusShare alloc] initWithClientID:clientID];
+  share_.delegate = self;
+  appDelegate.share = share_;
+
+  [super viewDidLoad];
+}
+
+- (void)viewDidUnload {
+  GooglePlusSampleAppDelegate *appDelegate = (GooglePlusSampleAppDelegate *)
+      [[UIApplication sharedApplication] delegate];
+  appDelegate.share = nil;
+  share_.delegate = nil;
+  [share_ release];
+  share_ = nil;
+
+  [super viewDidUnload];
+}
+
+#pragma mark - UITextFieldDelegate
+
+- (BOOL)textFieldShouldReturn:(UITextField *)textField {
+  [textField resignFirstResponder];
+  return YES;
+}
+
+#pragma mark - GooglePlusShareDelegate
+
+- (void)finishedSharing:(BOOL)shared {
+  NSString *text = shared ? @"Success" : @"Canceled";
+  shareStatus_.text = [NSString stringWithFormat:@"Status: %@", text];
+}
+
+#pragma mark - UIActionSheetDelegate
+
+- (void)actionSheet:(UIActionSheet *)actionSheet
+    didDismissWithButtonIndex:(NSInteger)buttonIndex {
+  if (buttonIndex == 0) {
+    [self shareButton:nil];
+  } else if (buttonIndex == 1) {
+    shareStatus_.text = @"Status: Sharing...";
+    MFMailComposeViewController *picker =
+        [[[MFMailComposeViewController alloc] init] autorelease];
+    picker.mailComposeDelegate = self;
+    [picker setSubject:sharePrefillText_.text];
+    [picker setMessageBody:shareURL_.text isHTML:NO];
+
+    [self presentModalViewController:picker animated:YES];
+  }
+}
+
+#pragma mark - MFMailComposeViewControllerDelegate
+
+- (void)mailComposeController:(MFMailComposeViewController *)controller
+          didFinishWithResult:(MFMailComposeResult)result
+                        error:(NSError*)error {
+  NSString *text;
+  switch (result) {
+    case MFMailComposeResultCancelled:
+      text = @"Canceled";
+      break;
+    case MFMailComposeResultSaved:
+      text = @"Saved";
+      break;
+    case MFMailComposeResultSent:
+      text = @"Sent";
+      break;
+    case MFMailComposeResultFailed:
+      text = @"Failed";
+      break;
+    default:
+      text = @"Not sent";
+      break;
+  }
+  shareStatus_.text = [NSString stringWithFormat:@"Status: %@", text];
+  [self dismissModalViewControllerAnimated:YES];
+}
+
+#pragma mark - IBActions
+
+- (IBAction)shareButton:(id)sender {
+  NSString *inputURL = shareURL_.text;
+  NSURL *urlToShare = [inputURL length] ? [NSURL URLWithString:inputURL] : nil;
+  NSString *inputText = sharePrefillText_.text;
+  NSString *text = [inputText length] ? inputText : nil;
+  shareStatus_.text = @"Status: Sharing...";
+  [[[[share_ shareDialog] setURLToShare:urlToShare] setPrefillText:text] open];
+}
+
+- (IBAction)shareToolbar:(id)sender {
+  UIActionSheet *actionSheet =
+      [[[UIActionSheet alloc] initWithTitle:@"Share this post"
+                                   delegate:self
+                          cancelButtonTitle:@"Cancel"
+                     destructiveButtonTitle:nil
+                          otherButtonTitles:@"Google+", @"Email", nil]
+          autorelease];
+  [actionSheet showFromToolbar:shareToolbar_];
+}
+
+@end