![]() 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. On the other hand, both CocoaPods and Carthage support Objective-C packages in addition to Swift ones.SwiftUI's declarative syntax makes it straightforward to describe the user interface you have in mind. The IBM Swift Package Catalog was first replaced by the Vapor Community Package Catalog API and then by the Swift Package Registry, not to be confused with the Swift Package Index which has just been endorsed by Apple.Īmong the advantages of the Swift Package Manager versus alternative package repositories like CocoaPods and Carthage is its integration with the Swift build system and tight integration within Xcode, which makes its use almost transparent to developers. The Index has started more recently to provide the community a platform to host documentation for their packages, which is often critical to decide whether to use a dependency.Īny package author can now opt-in to documentation generation, and once the build system has completed a successful build, we’ll host versioned DocC documentation.Īfter Apple introduced the Swift Package Manager as the official tool for Swift code distribution, a new arena opened up for services like the now defunct "IBM Swift Package Catalog", which was launched in a timely fashion by IBM but failed to catch sufficient traction with developers. The results of the build step are summarized for each package in a compatibility matrix. ![]() It’s such a large operation that it needs its own custom monitoring app. The “build system”, as we now call it, processes an average of 5,000 builds per day and has completed more than five million builds in total. Each package is cloned and built for a number of different Swift versions and platforms to assess its compatibility and metadata is collected to identify essential information. The Index includes currently over 5,000 packages, practically all of them hosted on GitHub. At first glance, a package page on the index can look similar to its GitHub repository page, but we focus the metadata to be relevant to potential user of the package. It answers questions like how long a package has been in development, how the author has licensed the code, whether pull requests and issues are being monitored and responded to, and more. Instead it focuses on indexing package metadata to provide developers with detailed information to help them drive their decisions about which packages to include in their projects. ![]() The Swift Package Index, as its name implies, is not a full-fledged repository of packages. The project is now officially sponsored by Apple, thus making it the official place to go for anything related to Swift packages Schmidt with the aim of making it easier for Swift developers to search and discover Swift packages. ![]() The Swift Package Index was created about three years ago by Dave Verwer and Sven A. ![]()
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