![]() ![]() To demonstrate everything, here’s the implementation of the above method for our example: This is possible through the destination property of the segue parameter value. Once we distinguish the segue, we must get access to the view controller that is about to be presented, and eventually assign the values we want to its various properties. Therefore, this is why it’s important to set identifiers for your segues when you create them. As this method is general and is called for all segues that are connected to the source view controller, we must manually distinguish the segue that we refer to using the segue’s identifier. This is the place where you can pass any data you want to the view controller that will be presented, and obviously this is what we’ll use here too. When presenting view controllers using segues, the above method is called every time before a view controller is presented. In case it’s not there, just copy and paste the above snippet in your FirstViewController.swift file. When you add a new view controller into a project, this method is added automatically by Xcode along with the rest of the default code, however it’s commented out. To refresh your memory, in the previous part of the tutorial we had connected a segue from the button titled Second View Controller to the Second View Controller scene with that identifier in the Main storyboard: We’ll do that when we present the latter using the segue with the identifier idSegueSecondVC. From Source to Destination: Sending Data When Using Seguesįor the sake of our example, we’ll send a randomly generated number (Int number) from the FirstViewController to the SecondViewController after it’s loaded but not presented yet. On top of that and regarding this post, to keep things as easy as possible and always into the point, we’ll use the Xcode console to display messages and verify that all the actions presented next are actually working. Also, you can download a project containing everything presented in that post from here. Right before we start, I take as granted that you’ve followed the first part of this tutorial (or at least you’ve read the parts you’re interested in), as the simple project demonstrated there is the base where we’ll keep on building. After that, I’ll focus on how to send data back from from the new view controller to the previous one, and I’ll go through three different ways that allow us to perform such an action. In the sections that follow, I’ll start by showing how to send data from the already presented view controller to the new (presenting) one, both when using segues or code for the presentation. However, in that post I didn’t show at all how data can be sent back and forth between two view controllers, so I’m going to do so right next. ![]() Those techniques include both graphical and programming approaches, so everybody can choose what fits best to them when a new view controller is about to be presented. ⏱ Reading Time: 12 minsIn the first part of this two-step tutorial I presented the techniques for loading and presenting a view controller.
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