iOS Remote Push Push Development Tutorial

Remote push notifications

What are remote push notifications

As the name implies, it is a notification pushed from the remote server to the client (requires internet connection). Remote push service is also known as APNs (Apple Push Notification Services)

Why do we need remote push notifications

Limitations of traditional data acquisition: if the user closes the app, it is impossible to communicate with the app's server and cannot obtain the latest data content from the server

Remote push notifications can solve the above problems. Whether the user opens or closes the app, as long as the internet is connected, they can receive remote notifications pushed by the server

Instructions for using remote push notifications

• All Apple devices will establish long connections with Apple's servers when connected to the internet. What is a long connection? As long as it is connected to the internet, the connection is always established
• Functions of long connections: time calibration, system upgrade, Find My iPhone, ...
• Advantages of long connections: fast data transmission speed, data keeps the latest status

Push Principle

Provider is our company's server, which finds our devices through Apple's APNs server and pushes messages to the client applications on our devices. How does the APNs server find our devices and the applications on them? The answer is DeviceToken. DeviceToken needs to be configured with a push certificate to obtain it, and the push certificate requires knowledge of our APP ID (the BundleID of the application, the unique identifier of the application) and UDID (the unique identifier of the device), as well as the UDID of our own server. Let's first create a push certificate, log in to the developer center, and click on the certificate module.

Click the iOS Apps certificate

Enter the following interface

Click App IDs, then click the plus sign in the upper right corner

The arrow points to the application ID description, we assume we have written a very cool application, ExcitedApp, and then we fill in the App ID, note that the App ID here is fixed and cannot contain asterisks

Next, we add the services required by the App and then click Continue

Click Next all the way, complete, find our ExcitedApp in the App IDs list, and we see

Find that the Push service is yellow warning, at this time click Edit, find the push module, we need to configure the push certificate, click the location indicated by the red arrow

We need a CSR file, CSR is a certificate signing request file, which means that our MAC has the permission to debug push notifications, click Continue

Click Continue and we see

Then we open the Keychain on the Mac and request a certificate from the certificate authority

The first two can be written arbitrarily, and finally choose to save to disk

After completing, next we can add the CSR file

After adding, select Generate

The certificate is configured, download it

　

Configured!

By the way, we also configure the release certificate, the steps are the same

Open the certificate we just downloaded and add it to the keychain

Finally, we can start working on our project, I almost cried

Don't forget to modify the bundle ID, and you also need to create a real device debugging certificate

The debugging on real devices is not elaborated here, after doing all this, we finally get the DeviceToken

Register push notifications in AppDelegate.m

- (BOOL)application:(UIApplication *application didFinishLaunchingWithOptions:(NSDictionary *}
  UIUserNotificationType types = UIUserNotificationTypeBadge | UIUserNotificationTypeSound | UIUserNotificationTypeAlert ;
  UIUserNotificationSettings * setting = [UIUserNotificationSettings settingsForTypes:types categories:nil];
  [[UIApplication sharedApplication] registerUserNotificationSettings:setting];
  return YES;
 }
 -(void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
 {
  NSLog(@"%@",deviceToken);
 }

DeviceToken Handling Process　

Next, let's test our push with PushMebaby: https://github.com/stefanhafeneger/PushMeBaby/

Add our push certificate to the project directory

　

You can receive push notifications on your phone next.

This article has been organized into 'iOS Push Tutorial', welcome to study and read.

That's all for this article. I hope it will be helpful to everyone's learning, and I also hope everyone will support the Yelling Tutorial more.

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