![]() A type that conforms to PreviewProvider is required to implement a static computed previews property of type some View. To create a preview, you declare a type that conforms to the PreviewProvider protocol. You are also more likely to spot user interface issues you might otherwise overlook. Because of the much shorter feedback cycle, user interface development is faster and less frustrating. ![]() SwiftUI's deep integration with Xcode may seem like a nice to have feature, but I can assure you that it has a noticeable impact on your day to day work. Let's find out what ContentView looks like if we pass a long string to ContentView's initializer. Third, it is trivial to configure the preview however you like. It also means you don't need to modify the application's state to preview the changes you made. That one benefit can save you a lot of time. Second, you don't need to navigate to the view your are working on. ![]() This allows for a much shorter feedback cycle, enabling rapid user interface development. First, you don't need to run the application in a simulator or on a physical device every time you make a change. Previews are convenient and have several benefits. Remember that keyboard shortcut because you use it frequently when building user interfaces using SwiftUI. You can resume the preview by clicking the Resume button in the top right or by pressing Command + Option + P. If you make significant code changes, Xcode pauses the preview. Every time we make a change in the code editor on the left, Xcode updates the preview in the canvas on the right. You learn how to change that later in this episode.īecause Xcode is aware that we are currently working on ContentView, it knows that it only needs to compile ContentView.swift to update the preview. It uses the current run destination to create the preview, iPhone 12 in this example. Xcode makes a number of optimizations to make this process as fast as possible. Xcode generates the preview by building your application behind the scenes. Xcode automatically shows you a preview of the view you are working on in the canvas on the right. Revisit the Notes project and open ContentView.swift. SwiftUI is deeply integrated into Xcode, making it almost trivial to build user interfaces using SwiftUI. The API is intuitive and the framework's learning curve is gentle. SwiftUI's declarative syntax makes it straightforward to describe the user interface you have in mind.
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