You need to Select Use SwiftUI during the project setup to use SwiftUI. To use the SwiftUI design canvas Xcode 11 must running on macOS 10.15. SwiftUI requires iOS 13, iPadOS 13, watchOS 6, tvOS 13, or macOS 10.15. With SwiftUI, Xcode 11 constantly run real app interface to see the live change directly in the design canvas, or you can instantly run app on an attached device. So, you can use SwiftUI views with objects from the UIKit, AppKit, and WatchKit frameworks to take further advantage of platform-specific functionality. We can share common UI code across all Apple platforms, and add custom experiences for each OS. Xcode 11 provides design tools to make it as easy as drag-and-drop to construct or edit UI, all in the same Swift code file you can also edit by hand. Xcode 11 includes SwiftUI, a new Swift framework to provides views, controls, and layout structures for declaring your app's user interface.

Xcode 11 can coexist with previous versions of Xcode.

Xcode 11 supports running multiple concurrent versions of the Xcode app and of any associated tools such as Simulator.

Xcode 11 includes SDKs for iOS 13, iPadOS 13, watchOS 6, macOS 10.15, tvOS 13 and Swift 5.1.

Xcode 11 requires a Mac running macOS 10.14.3 or later.

Includes the latest SDKs for macOS 10.15, iOS 13, iPadOS 13, watchOS 6, and tvOS 13. Xcode 11 includes everything you need to create amazing apps for all Apple platforms.

Xcode is the complete developer toolset used to create apps for Apple TV, Apple Watch, iPad, iPhone, and Mac.

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