![]() Secondly, investing in writing tests and previews, they ultimately help you develop faster. This means you have confidence that what you’re testing and previewing represents what the people who will use your app will experience, too. We're not emulating or interpreting code. Like tests, previews run real code in your real project. This isn’t a perfect analogy, but it might be helpful to think of previews similar to tests. For example, you can test it in dark mode or different type sizes and orientations. And, once you have a preview defined, Xcode can run that preview in different contexts automatically without you needing to write any additional code. This means that you can focus on writing and iterating on your code, and Xcode will automatically handle building, running, and updating your previews. First, it'll examine the change you made and recompile the minimal amount of code. When you edit any of the Swift code in your project, Xcode will do two things automatically. ![]() But previews are also about iterating faster. You can do whatever you need to set up a preview for any view in your app and it will appear right in the canvas in Xcode. Because your previews can access these symbols and resources, previews are really flexible. Previews are compiled into your app, right alongside the rest of your app code and your resources. You use the #Preview macro, and return a view. They are written at the top level of a source file, meaning they are not nested inside of any types or functions. So what are previews? A preview is a snippet of code that makes and configures a view. I want to give you a couple of tips and tricks to help take previews further in your project. And finally, as you start to adopt previews in your project, there are some common scenarios or questions you’re bound to encounter. I’ll show you how to write these and some of their unique workflows in Xcode. Second, there are two different ways you can provide content for your previews: views and widgets. It’s helpful to understand a little bit of how they work and how they relate to the rest of the code in your project. Whether you’re new to previews, or you’ve been using them for a while, I want to help you make the most of them. ![]() You can use them across your entire app with different kinds of views, data, and devices. That’s why we made previews so you can have that near-instant visual feedback so you can focus on being creative. Building software, and especially apps, is a really iterative and creative process, so you want the fastest way to test your code and experience what you’re making come to life. ![]() ♪ ♪ Kevin Cathey: Hi, my name is Kevin, and I work on Previews. Search the forums for tag wwdc2023-10252.Have a question? Ask with tag wwdc2023-10252.22:08 - Previewing on devices for full fidelity and access to data.20:28 - Passing sample data into previews.6:08 - Demo: Putting writing previews into action.We'll also show you how to add previews to libraries, provide sample assets, and preview your views in your physical devices to leverage their capabilities and existing data. Explore a collage of unique workflows for interacting with views right in the canvas, find out how to view multiple variations of UI simultaneously, and discover how you can travel through your widget's timeline in seconds to test the transitions between entries. Learn how you can use the #Preview macro on Xcode 15 to quickly iterate on your UI code written in SwiftUI, UIKit, or AppKit. Build programmatic UI with Xcode Previews.previewDisplayName() modifier, which lets you put a name under a device in the preview window. When using specific devices for previewing, you’re likely to find it useful to add in the. previewDevice(PreviewDevice(rawValue: "iPhone 14 Pro Max")) “iPhone 14”.įor example, this shows a preview on the iPhone 14 Pro Max: ContentView() This needs to be provided with the exact name of a device as seen in Xcode’s destination menu, e.g. Xcode’s SwiftUI preview lets us show our designs in multiple screen sizes at the same time using the. How to preview your layout in different devices
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