iOS/Swift：向另一台设备发送通知的快速而肮脏的方式？

Question

I'm trying to write a super-simple iOS app, just for personal use (ie it doesn't need to conform to any App Store stuff). I want it to do the following. Assume it's installed on two devices, both of which I own/control.

On device 1, it has a button that, when pressed, will immediately cause a notification to pop up on device 2.

I'm fine with hardcoding specific apple IDs, device IDs, whatever; it's also fine if this only works when the two devices are on the same LAN/Wifi. all I want is for the above to work, in the easiest way possible, and preferably without needing anything to run on a server anywhere.

How simply can this be implemented? I've set up a whole push-notification system once before, but that required some server-side stuff. Hoping to be able to do this without any of that.

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Update : realized I wasn't clear in the original post that I need the notification on Device 2 to pop up whether or not the app is currently open/running on that device.

Answer 1

I think that what you are searching for is multipeer connectivity framework.

The Multipeer Connectivity framework supports the discovery of services provided by nearby devices and supports communicating with those services through message-based data, streaming data, and resources (such as files). In iOS, the framework uses infrastructure Wi-Fi networks, peer-to-peer Wi-Fi, and Bluetooth personal area networks for the underlying transport. In macOS and tvOS, it uses infrastructure Wi-Fi, peer-to-peer Wi-Fi, and Ethernet.

source:https://developer.apple.com/documentation/multipeerconnectivity .

You can also check those tutorials:

https://www.ralfebert.com/ios-app-development/multipeer-connectivity/

https://www.hackingwithswift.com/example-code/networking/how-to-create-a-peer-to-peer-network-using-the-multipeer-connectivity-framework

Answer 2

Send sms to port is a way (the protocol will become SMS): https://developer.apple.com/documentation/foundation/nsportmessage

and Maybe Firebase Remote Config can help you: you can get your data in FCM remote config (key-value) from the app : https://www.raywenderlich.com/17323848-firebase-remote-config-tutorial-for-ios https://firebase.google.com/docs/remote-config/get-started?platform=ios , and you can modify your data whenever you want, and the app can fetch it.

Answer 3

I have similar requirements, and it seems like APNS (Apple Push Notification Service) is required for this because it's one of the only ways to 'activate' an application that is in the background.

As a result, then the question is how to make APNS as painless as possible? It seems like combining Firebase Cloud Messaging (or FCM) (to manage APNS / sending messages), and Firebase Functions (to help manage FCM server-side requirements) is one decent option.