Networking examples for appleOS – The.Swift.Dev.

Networking examples for appleOS – The.Swift.Dev.

Discover ways to use Bonjour, with UDP/TCP sockets, streams and talk by means of CoreBluetooth or the watch APIs.


This text was initially written again ultimately of 2015. The supply code is deprecated and never appropriate with present Swift variations, so I eliminated it.

If you wish to discover ways to make a community connection between your units utilizing Bonjour discovery service you might be on the proper place. On this submit I’m going to indicate you the fundamentals, so for instance it is possible for you to to make a distant controller out of your watch or iOS system with a view to ship information on to any tvOS or macOS machines.

Multi-platform improvement

If you wish to create an app that helps a number of platforms, you would possibly need to goal macOS, iOS, watchOS, tvOS and shortly Linux as properly. The code snippet beneath goes that will help you detecting the present platform that you’re working with.

#if os(iOS)
    let platform = "iOS"
#elseif os(macOS)
    let platform = "macOS"
#elseif os(watchOS)
    let platform = "watchOS"
#elseif os(tvOS)
    let platform = "tvOS"
#elseif os(Linux)
    let platform = "linux"
    let platform = "unknown"


Community connection 101

Bonjour discovery service

Bonjour, also referred to as zero-configuration networking, allows computerized discovery of units and providers on an area community utilizing trade normal IP protocols.

So mainly with Bonjour you’ll find community units in your native community. This comes very helpful in case you are making an attempt to determine the listing of units which can be linked to your LAN. Utilizing NetService class will make it easier to to detect all of the units with the out there providers that they assist. The entire Bonjour API is comparatively small and well-written. From the facet of server aspect you simply need to create the NetService object, and hearken to the incoming connections by means of the NetServiceDelegate.

It’s a must to be on the identical WiFi community with all units / simulators.

TCP connection

TCP gives dependable, ordered, and error-checked supply of a stream of octets (bytes) between functions working on hosts speaking by an IP community.

With the assistance of TCP you’ll be able to construct up a dependable community connection. There’s a Stream class in Basis that will help you sending information backwards and forwards between units. When you’ve got a working connection type NetServiceDelegate, simply hearken to the stream occasions to deal with incoming information by means of the StreamDelegate. I do not need to go into the main points, simply obtain the instance code and test it out for your self.

UDP connection

With UDP, pc functions can ship messages, on this case known as datagrams, to different hosts on an Web Protocol (IP) community.

When you have a look at the article about UDP you will clearly see that the principle distinction from TCP is that this protocol won’t assure you security of the information supply. Information could arrives unordered or duplicated, it is your job to deal with these situations, however the UDP is quick. If you wish to construct a file switch app you need to undoubtedly go together with TCP, however for instance controlling a real-time motion sport UDP is simply as ok.


This library is absolutely the winner for me and doubtless it’s the best choice for everybody who desires to arrange a community connection actually rapidly, as a result of it requires method much less code than implementing delegates. In fact you will nonetheless want the Bonjour layer above the entire thing, however that is simply effective to take care of.

In case you are utilizing CocoaAsyncSocket you will notice that the API is simple, solely after 5 minutes I might comparatively simply determine it out what is going on on and I used to be in a position to ship messages by means of the community. It helps all of the Apple platforms, you’ll be able to seamlessly combine it utilizing Carthage or CocoaPods.

CoreBluetooth APIs

I used to be probably not aware of the CoreBluetooth framework API’s, that is the rationale why I mainly simply adopted and ported this code instance to Swift 4. Truthfully I felt that the API is one way or the other overcomplicated with all these messy delegate features. If I’ve to selected between CoreBluetooth or CocoaAsyncSocket, I would go together with the final one. So sure, clearly I’m not a bluetooth skilled, however this little mission was a very good first impression about how issues are working contained in the CB framework.

WatchConnectivity framework

If you wish to talk between iOS and watchOS you will in all probability use the WatchConnectivity framework, particularly the WKSession class. It is actually not so difficult, with just some traces of code you’ll be able to ship messages type the watch to the iPhone. You’ll be able to learn this tutorial, however in the event you obtain my last sources for this text, you will discover virtually the identical factor contained in the bundle.


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