![]() As an example, let’s say that we’re working on an iOS app for managing various events, which includes the following EventDetailsView: class EventDetailsView: UIView Importing view controllers into SwiftUIīoth of the UIKit-based views that we’ve been importing so far have been stand-alone, lower-level components, but we can also bring entire view controllers into SwiftUI as well. Instead, let’s explore how we can reuse existing UI components, all while making them fit in perfectly alongside our new, SwiftUI-based views. Reusing existing componentsĪlthough it might be tempting to start out fresh when migrating a given project to SwiftUI, and rewrite the entire app from the ground up, that’s often not a wise decision, as doing so means throwing away working, battle-tested production code just because it happens to be implemented using a somewhat older UI framework. All SwiftUI-provided protocols and methods that we’ll use are identical between iOS and macOS in this case, with the only difference being that the macOS ones use NS instead of UI within their names. While several aspects of this topic have already been covered on this site before, this week and the week after, let’s dive much deeper into how SwiftUI and UIKit can be combined in various ways - starting with how we can bring increasingly complex UIKit-based views and view controllers into the declarative world of SwiftUI.Īlthough all of the examples within this article will be UIKit-based, the same tools and techniques can also be used with AppKit as well. Not only does that act as a useful “escape hatch” for whenever a given use case is not yet natively supported by SwiftUI itself, it also enables us to incrementally migrate an existing UIKit or AppKit-based project to Apple’s new UI framework, all while reusing many of our core UI components. Line 2 pushed the view controller on the navigation controller stack maintained by ViewController.One of SwiftUI’s major strengths is just how well it integrates with both UIKit and AppKit. Line 1 creates a view controller of class TwoViewController, using the XIB of the same name. NavigationController?.pushViewController(vc, animated: true) Let vc = TwoViewController(nibName: "TwoViewController", bundle: nil) Add the following two lines to the nextButton Remove the commented out method except the viewDidLoad(). Control-drag the button and make an action for a UIButton called nextButton. In the view controller, Add a label and a button so your code looks like the diagram: From the drop down menu select Edit>Embed in > Navigation Controller. Be sure to select the controller and not the view. Go into the storyboard and select the blank view controller. Start a new single view project in Swift called SwiftProgNavControllerDemo. Let’s look at a few ways to do so programmatically by pushing and popping to the navigation stack directly. ![]() I’ve shown elsewhere how to move to navigation controllers through segues. We use the terms push and pop a lot to talk about stacks, and you will find they describes methods often. ![]() When you remove a card from the stack and show the card below it, you pop it off the stack. Then press control and drag the button to the target screen. When you place a card on top of the stack, you push a card on the stack. The easiest way to switch between screens in iOS is. ![]() Stacks work a lot like a deck of cards that are face up. If you are not familiar with the stack data structure, it is useful to understand stacks and their nomenclature a little better. The newest view controller is the visible one. ![]() Navigation view controllers are stack based. In this chapter, We’ll go through some of the Swift code for the Navigation controller. I’ve covered much of their use in other posts about MVC, segues and delegates. Navigation controllers are the workhorse of organizing view controllers. ![]()
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |