Xcode 12.3 includes Swift 5.3 and SDKs for iOS 14.3, iPadOS 14.3, tvOS 14.3, watchOS 7.2, and macOS Big Sur 11.1

New in Xcode 12 • Xcode IDE adopts the refined macOS Big Sur design including updated toolbar, icons, and sidebar • Mac apps are updated to Universal, and Macs with Apple silicon can debug both the Apple silicon and Intel versions • Multiplatform template generates a single project with shared SwiftUI code across iOS, iPadOS, and macOS apps • Mac Catalyst projects can use the Mac idiom to take total control of the app’s interface using native scale • When run on a Mac with Apple silicon, Xcode can test and debug iPhone and iPad apps as they run on macOS • Document tabs open any type of document in a lightweight editor tab, including logs, asset catalogs, and UI files • StoreKit testing framework and transaction manager make it easy to test and debug in-app purchases • Navigator fonts are now resizable based on the system setting, or can be manually configured • Organizer is completely redesigned, and reports new app metrics such as hitches in animation and scrolling • SwiftUI Views can be turned into reusable components that appear in the Xcode library and in code completions