![]() It initializes your class instance single time only with static property and it will share your class instance globally. Open the Xcode project, choose SwiftWebSocketServer target and run to run the server. This is very simple, common and easy to use in your project. Now that all parts of our infrastructure are ready, we will run server and client simultaneously. Swift share singleton throughout project how to#Please refer to this section of earlier blog post to understand how to add network capabilities to Mac and enable outgoing network connections Running client and server ![]() Since we're assuming the web socket is running on local port 8080, we will use ws://localhost:8080 as a base web socket URL.įinal class SwiftWebSocketClient: NSObject Please note that since it's a Mac app, outgoing network connections won't work immediately. In order to do that, we will declare SwiftWebSocketClient as a delegate of type URLSessionWebSocketDelegate so that it can receive a callback as the connection is opened and closed. In order to prevent the client from opening the connection multiple times, we will use a file-level boolean flag which will indicate whether a connection has been opened or not.Īs the client opens and closes the connection, our class needs to keep track of these activities. ![]() In order to make network service easily accessible to all parts of the app, we will make a singleton object of SwiftWebSocketClient class. In order to make things more interesting, we will also add a tiny UI to our Mac app, which is just a label with a title and another label to indicate dummy stock prices in real-time. Create a new target named SwiftWebSocketClient and add a new file SwiftWebSocketClient.swift under target. Referencing an earlier article on creating server using NWConnection, we will add a client on top of it by creating a new target under the same project. Swift share singleton throughout project full#The full source code for Swift client and server is already on Github Creating a new target for the client In this post, we will complete that article by learning how to create an equivalent client which can talk to this server on the specified port.Īs mentioned in my other article, we will use URLSessionWebSocketTask to create a connection on the client-side. Singletons can often act as a shortcut for accessing certain core values or objects, since they are essentially accessible from anywhere.In the last post, we saw how to create a web socket server using NWConnection. The second part of the puzzle, I think, is convenience. As third party developers, we often look to Apple to define the "best practices" for their platforms, and any pattern that they commonly use often becomes very widely spread in the community as well. First, I think a major reason that the singleton pattern has been used so much when writing apps for Apple's platforms, is that Apple themselves use it a lot. If most developers agree that they should be avoided, why do they keep popping up? Let's dive right in! Why are singletons so popular?įirst off, let's start by asking why singletons are so popular to begin with. ![]() This week, let's take a look at exactly what the problems are with using singletons and explore some techniques that can be used to avoid them. There seems to almost be a consensus in the community that singletons are "bad", but at the same time both Apple and third party Swift developers keep using them both internally within apps and in shared frameworks. "I know singletons are bad, but.", is something that developers often say when discussing code. ![]()
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