You can run into examples like the SWAttributionView from the new SharedWithYou framework that has to be implemented using a UIKit view. Not every UIKit view is already available in SwiftUI for you to use. Hosting a UIKit View in SwiftUI using UIViewRepresentable I’ve earlier explained how you can use Xcode Previews with existing UIKit views, which we’ll take to the next level in this post by adapting existing UIKit views in SwiftUI using the UIViewPresentable protocol. When migrating your projects to SwiftUI, you probably have a lot of existing code that you don’t want to throw away but rather use in our newly built views. You don’t want to rewrite all your existing UIKit views immediately, so you can smoothen the process of migrating to SwiftUI by making your custom views available in SwiftUI. While picking your minimum iOS version to support, you might have opened the door to fully adopting SwiftUI after dropping iOS 12. ZStack, a depth-based stack, which shows views. HStack, a horizontal stack, which shows views in a left-to-right list. You can use 3 kinds of stacks with SwiftUI: VStack, a vertical stack, which shows views in a top-to-bottom list. Learn how to create solid and maintainable apps with fewer bugs using this free guide. Using stacks in SwiftUI allows you to arrange multiple views into a single organized view with certain properties. In UIKit, you use the UIHostingController, which acts like a SwiftUI host for your views.Īrchitecting SwiftUI apps with MVC and MVVM Although you can create an app simply by throwing some code together, without best practices and a robust architecture, you’ll soon end up with unmanageable spaghetti code. Whether it’s a custom UIView created by yourself or a UIView provided by Apple that isn’t available in UIKit yet: you can make them available in SwiftUI. This can be either horizontally (HStack), vertically (VStack), or on top of each other (ZStack). A Stack, another addition to SwiftUI, tells the framework how to display the views correctly. The UIViewRepresentable protocol allows you to adapt to the mechanism of SwiftUI declarative views and creates a bridge between UIKit and SwiftUI. Make sure you embed them on what’s known as a Stack. You can use a similar technique to make SwiftUI views available in UIKit views by implementing the UIHostingController. SwiftUI requires you to declare the view representation, but the underlying SwiftUI implementation will optimize how final views are drawn on the screen. Your SwiftUI code is converted to UIKit views behind the scenes. Although VStack can contain up to ten views inside it, each of these can be a VStack, HStack, or Group and each can have ten types inside it. In other words, it can’t be set to several items because this could involve several types. 7 min read UIViewRepresentable explained to host UIView instances in SwiftUIĪdopting the UIViewRepresentable protocol allows you to host UIView instances in SwiftUI. The Texts here are embedded in a VStack because the body variable’s opaque result type has to be set to one type.Things to consider when adopting SwiftUI in a UIKit application.The benefits of using SwiftUI as soon as possible in a UIKit app. Presenting a SwiftUI view in a UIKit view controller.Using the same technique to create Xcode Previews of UIView elements.
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