iOS8 Push Notifications

原贴地址：https://parse.com/tutorials/ios-push-notifications

github地址：https://github.com/ParsePlatform/PushTutorial

iOS Push通知已经广泛应用于实际开发中，iOS8与之前注册push有所不同，这里把如何潜入代码贴一下，以作记录，详情请看上面地址链接

Adding Code for a Push Enabled iOS Application

We are now ready to start programming. We need to make a few modification to the app delegate in order to receive push notifications.

To register the current device for push, call the method[application registerForRemoteNotifications] in the app delegate's-application:didFinishLaunchingWithOptions: method.

- (BOOL)application:(UIApplication *)applicationdidFinishLaunchingWithOptions:(NSDictionary *)launchOptions {   ...   // Register for Push Notitications, if running iOS 8   if ([applicationrespondsToSelector:@selector(registerUserNotificationSettings:)]) {     UIUserNotificationType userNotificationTypes = (UIUserNotificationTypeAlert |                                                     UIUserNotificationTypeBadge |                                                     UIUserNotificationTypeSound);     UIUserNotificationSettings *settings = [UIUserNotificationSettingssettingsForTypes:userNotificationTypes                                                                             categories:nil];     [application registerUserNotificationSettings:settings];     [application registerForRemoteNotifications];   } else {     // Register for Push Notifications before iOS 8     [application registerForRemoteNotificationTypes:(UIRemoteNotificationTypeBadge |                                                      UIRemoteNotificationTypeAlert |                                                      UIRemoteNotificationTypeSound)];   }   ... }

If the registration is successful, the callback method-application:didRegisterForRemoteNotificationsWithDeviceToken: in the application delegate will be executed. We will need to implement this method and use it to inform Parse about this new device.

- (void)application:(UIApplication *)applicationdidRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {   // Store the deviceToken in the current installation and save it to Parse.   PFInstallation *currentInstallation = [PFInstallationcurrentInstallation];   [currentInstallation setDeviceTokenFromData:deviceToken];   currentInstallation.channels = @[@"global" ];   [currentInstallation saveInBackground]; }

When a push notification is received while the application is not in the foreground, it is displayed in the iOS Notification Center. However, if the notification is received while the app is active, it is up to the app to handle it. To do so, we can implement the [application:didReceiveRemoteNotification] method in the app delegate. In our case, we will simply ask Parse to handle it for us. Parse will create a modal alert and display the push notification's content.

- (void)application:(UIApplication *)applicationdidReceiveRemoteNotification:(NSDictionary *)userInfo {   [PFPush handlePush:userInfo]; }

You should now run your application (on your iOS device) to make sure everything is set up correctly. If it is, the first time you run this app you should see a modal alert requesting permission from the user to send push notifications.