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Wiring Up the Client
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You want to be able to send to the UI elements on-screen and know when the button has been pressed. First, create the outlets and actions that you re going to connect to in Push2ViewController.h. In particular, add IBOutlets for a UITextView and UILabel and an IBAction for a button:
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CHAPTER 10: Demystiying Apple s Push Notification Service
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IBOutlet UITextView *messageTextView; IBOutlet UILabel*deviceTokenField; IBOutlet UITextField *usernameField; -(IBAction)handleSendButton:(id)sender;
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Next, switch to Interface builder and add the UITextView, a UILabel, a UITextField (for the username), and a UIButton. Then wire these all up in Interface Builder, as shown in Figure 10-20.
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Figure 10-20. The objects, layout, and connections in Interface Builder for our sample application
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Then in the code, you have a few details for talking back and forth between the push notification methods and the user interface, as well as the remote server. Here s what that looks like in the ViewController code:
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-(IBAction)handleSendButton:(id)sender { NSLog( @"handleSendButton" ); // make a get request to our script with the msg parameter set // msg=URLENCODEDSTRING; CFStringRef outString = CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)messageTextView.text, NULL, NULL, kCFStringEncodingUTF8); NSString *urlFormatString = @"http://2push2.us/apress/apress.php token=%@&cmd=msg&msg=%@"; NSURL *composedURL = [NSURL URLWithString:[NSString stringWithFormat:urlFormatString,deviceTokenField.text,(NSString *)outString]]; NSLog( @"composedURL:%@", composedURL ); NSString *result = [NSString stringWithContentsOfURL:composedURL];
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CHAPTER 10: Demystiying Apple s Push Notification Service
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NSLog( @"result:%@", result ); CFRelease(outString); } -(void)handleSetDeviceTokenField:(NSString *)inDeviceToken { NSLog( @"handleSetDeviceTokenField:%@", inDeviceToken ); deviceTokenField.text = inDeviceToken; } -(void)handleDidReceiveRemoteNotification:(NSDictionary *)userInfo { NSDictionary *aps = [userInfo valueForKey:@"aps"]; NSString *alert = [aps valueForKey:@"alert"]; messageTextView.text = alert; } And in the App Delegate where we interact with the notifications, here are the three key methods: - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { // register for remote notifications UIRemoteNotificationType types = UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert; [application registerForRemoteNotificationTypes:types]; // because we implement didFinishLaunchingWithOptions, the "old" entry method doesn't get called [self applicationDidFinishLaunching:application]; return YES; } - (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken { NSLog( @"didRegisterForRemoteNotificationsWithDeviceToken:%@", deviceToken ); NSString *inDeviceTokenStr = [deviceToken description]; NSString *tokenString = [inDeviceTokenStr stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"< >"]]; tokenString = [tokenString stringByReplacingOccurrencesOfString:@" " withString:@""];
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CHAPTER 10: Demystiying Apple s Push Notification Service
// send it to the remote server // we don t have the username yet NSString *hostString = @"http://2push2.us/apress/apress.php"; NSString *nameString = @"2Push2User"; NSString *argsString = @"%@ token=%@&cmd=reg&name=%@"; NSString *getURLString = [NSString stringWithFormat:argsString,hostString,tokenString,nameString]; NSString *registerResult = [NSString stringWithContentsOfURL:[NSURL URLWithString:getURLString]]; NSLog( @"registerResult:%@", registerResult ); // display it in the field on the view controller [self.viewController handleSetDeviceTokenField:tokenString]; } - (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo { NSLog( @"didReceiveRemoteNotification:%@", userInfo ); [self.viewController handleDidReceiveRemoteNotification:userInfo]; }
NOTE: As you switch between development and ad hoc distribution versions of your application, be sure to clean out (or change) your device tokens table, because you can t use development device tokens on the production service! Now, you re ready to resume your development and test where you left off in the server section earlier.
CHAPTER 10: Demystiying Apple s Push Notification Service
Figure 10-21. The 2Push2 client application user interface
Let s take a look at it in action. Presuming you ve handled the certificates, built the app, uploaded the server script, and done all the preliminary testing as suggested, you should finally be up and running, ready to test the app. First, load the server script to your remote server and, while you re at it, the certificate (.pem) file. The server script is how the app will register its device token to receive notifications, so the server-side has to be in place before the client-side app is run. Second, run the iPhone application. Optionally, install this on several devices right now to increase the fun! Third, send notifications! For convenience sake, when you now load the server script without any arguments, it will present you with the first device_token in the database instead of a placeholder, and thus you can copy and paste the Send Message example arguments and send a message right from your browser. From here, there s plenty more you can do to build out this application or anything else you want to do with the Apple Push Notification Server. I truly can t wait to see what you come up with!
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