Networking examples for appleOS – The.Swift.Dev.

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Discover ways to use Bonjour, with UDP/TCP sockets, streams and the right way to talk by 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 learn to make a community connection between your units utilizing Bonjour discovery service you’re on the correct place. On this publish 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 in an effort to ship knowledge on to any tvOS or macOS machines.

Multi-platform growth

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 nicely. The code snippet under 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 called zero-configuration networking, allows automated discovery of units and companies on a neighborhood community utilizing business commonplace IP protocols.

So mainly with Bonjour you will discover community units in your native community. This comes very useful in case you are attempting to determine the record of units which can be linked to your LAN. Utilizing NetService class will show you how to to detect all of the units with the obtainable companies that they help. The entire Bonjour API is comparatively small and well-written. From the side of server aspect you simply should create the NetService object, and hearken to the incoming connections by the NetServiceDelegate.

You need 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 purposes operating 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 knowledge forwards and backwards between units. You probably have a working connection kind NetServiceDelegate, simply hearken to the stream occasions to deal with incoming knowledge by 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, laptop purposes can ship messages, on this case known as datagrams, to different hosts on an Web Protocol (IP) community.

For those who take 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. Knowledge could arrives unordered or duplicated, it is your process to deal with these eventualities, however the UDP is quick. If you wish to construct a file switch app you need to positively go along with TCP, however for instance controlling a real-time motion recreation UDP is simply as adequate.


This library is absolutely the winner for me and possibly it’s the most suitable choice for everybody who needs to arrange a community connection actually shortly, as a result of it requires approach much less code than implementing delegates. In fact you will nonetheless want the Bonjour layer above the entire thing, however that is simply positive to cope with.

In case you are utilizing CocoaAsyncSocket you will notice that the API is simple, solely after 5 minutes I may comparatively simply determine it out what is going on on and I used to be in a position to ship messages by 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 accustomed to 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 someway overcomplicated with all these messy delegate features. If I’ve to selected between CoreBluetooth or CocoaAsyncSocket, I might go along with the final one. So sure, clearly I’m not a bluetooth skilled, however this little mission was 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 only a few traces of code you’ll be able to ship messages kind the watch to the iPhone. You possibly can learn this tutorial, however for those who obtain my last sources for this text, you will discover virtually the identical factor contained in the bundle.


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