Debugging

• Added autocompletion of symbols in Breakpoint navigator fields.

• Added a text field for entering an intents extension query.

• Added support for visually debugging the view hierarchy of iOS iMessage Extensions.

Instruments

• Removed the Display Settings pane and moved features to new locations. For more information, see Help > Instruments Help and New Features for Instruments in the Xcode Release Notes.

• The ability to view graphs for multiple runs at the same time in the timeline pane has been removed.

Provisioning

• Moved viewing and managing manual provisioning profiles to the General tab of the project editor.

• Simplified viewing and managing of signing certificates.

Simulator

• Choose Hardware > Siri to invoke Siri.

• The simctl tool of the xcrun command line tool adds two new commands that provide additional information for filing bug reports.

Static Analyzer

• Added checks for synthesized copy properties of mutable types, for calls to dispatch_once() that use an instance variable as the predicate, and for unintended comparisons between scalar values and number objects.

Swift

• Xcode 8.3 includes Swift 3.1.

• The Sequence protocol adds two new members, prefix(while:) and drop(while:).

Testing

• Added new APIs to simplify writing asynchronous tests.

Support for the Touch Bar

• You can customize Touch Bar controls for the source editor, playground editor, Interface Builder, view debugger, and memory graph debugger. Open the desired editor and choose View > Customize Touch Bar. For more information, open Xcode Help and search for Customize the Touch Bar controls.

Swift

• Xcode 8.2 is the last release with support for Swift 2.3. Use Edit > Convert > To Current Swift Syntax to migrate your projects to Swift 3.

Simulator

• Dragging an app bundle previously built with Xcode from disk onto Simulator installs the app.

• You can take a screenshot or a video recording of the simulator using the xcrun command-line utility. For more information, see Taking a Screenshot and Recording Video Using the Command Line.

Deprecation Notice

• Xcode 8.2 is the last release with support for Swift 2.3.

Compatibility

Xcode 8.1 requires a Mac running macOS 10.11.5 or later.

Support for the Touch Bar

• Xcode adds context-specific items to the Touch Bar, enabling easy access to Xcode functions and access to debugging facilities from within your running app.

• Interface Builder supports adding items to the Touch Bar for your macOS app as well as previewing the items you've added in the Touch Bar.

• Xcode includes a Touch Bar simulator window.

Interface Builder

• Click the new Update Frames button at the bottom of the Interface Builder canvas to update the frames of the selected objects and their children.

• Use the new Custom Gesture Recognizer in the object library for custom subclasses of UIGestureRecognizer or NSGestureRecognizer instead of using NSObject.

• The Pin button at the bottom of the canvas has been renamed to Add New Constraints.

Deprecation and Removal Notice

• Debugger() and DebugStr() are deprecated and the scheme editor no longer provides the option to enable these functions. If your project uses these functions, enable them by setting the environment variable USERBREAK with a value of 1.

• The Automation instrument has been removed from Instruments. Use Xcode’s UI Testing in its place.

• The version of Swift 2 (2.3) used in Xcode 8.1 is very close to the version used in Xcode 7.3.1. However, it has been updated for the newer SDKs, and therefore is not compatible with Swift frameworks compiled in Xcode 7.3.1. Distributing binary Swift frameworks remains unsupported in Xcode 8.

Swift Language

New in Xcode 8 – Swift 3. The latest release of Swift includes significant refinement to API naming designed to enhance your code's consistency and clarity. Also in this release, important frameworks have been upgraded to native Swift interfaces, such as Core Graphics and Grand Central Dispatch.

The Swift Programming Language (Swift 3) has been updated to include extensive Swift 3 detail information.

A Swift migrator is provided to help upgrade your Swift code to the latest Swift 3 language specifications and SDK requirements.

Signing

• New signing editor with easier to understand configuration and enhanced diagnostics

• Signing certificates available on a per-machine basis—reducing the need to revoke certificates or transfer private keys between development machines

Capabilities

• iCloud available for Mac apps distributed with Developer ID outside the Mac App Store

Interface Builder

• New adaptive UI development tools and workflow

• Pixel-perfect rendering of each device type within the design canvas

• Fast, new design canvas with support for editing even when zoomed out

Asset Catalogs

• Expressive Messaging feature support (“Stickers”)

Source Editing

• App extension for the Xcode source editor to enable developer plug-ins

• Auto-creation of documentation for Swift and Objective-C code

• Current line highlighting

• Color and image literals in Swift code

• Code completion for images

Debugging

• Memory debugging for visualization and navigation of memory relationships while debugging

• Runtime issues while debugging appear in the issue navigator, similar to compile-time issues:

  – Leaks issues identify potential leaked memory detected during debugging sessions.

  – Thread sanitizer issues identify threading-created race conditions on data changes at runtime.

  – View debugging issues identify constraints conflicts.

• Messages and Action extensions debugging support for iOS

• Greater control and visibility for more information when debugging views

Instruments

• Improved System Trace template with more detail to ease diagnosis of issues

  – Threads strategy view displaying narrative descriptions of exactly what happened to every thread on the system

  – CPU strategy view showing which threads are running on which CPUs

  – Points of Interest instrument permitting programmatically added points and regions of interest to a recording

• Improved Time Profiler instrument with application life cycle events

  – Presenting when an application was launching, running in the background, and similar events

• Improved Metal System Trace template with additional detail and support for macOS

• Interface improvements

Testing

• New build-for-testing and test-without-building options in xcodebuild—allows separating operations for use on different machines or at different times

• Test crash logs saved with test reports—especially useful for debugging crashes when running tests with Xcode Server

Documentation

• New Xcode Help and Instruments Help, based on standard macOS Help Viewer, accessible from the Help menu

• New SDK/API reference experience with:

  – Consolidated document sets—all SDKs in one package

  – Faster and more accurate search

  – Multiple, selectable language display

  – Greatly reduced disk space due to efficient database content model

Source Control

• Updated version editor:

  – Improved support for unversioned files

  – Change tracking across file renames in Git

  – File renames in navigator correctly renamed in Git

  – Full Unicode support for filenames in Git

  – New diff count and stepper to ease moving through diffs

  – Simplified file listings show changes in both flat and hierarchical views

• Support for Subversion 1.9

• Improved clone performance for large projects in Git when using Xcode Server

• Faster log and blame views

• Faster SCM status for files

Xcode Server

• Ability to choose background testing user for running integrations, including support for testing as a Standard or Administrator user

• Support for overriding toolchain settings on a bot

• Automatically runs upgrade integrations after Xcode updates to help isolate issues

• Enhanced issue tracking and communications:

  – Improved issue blame and tracking over time

  – Integrations that track bot configuration changes over time, and that can attribute issues to those changes

• Improvements to triggers:

  – Triggers able to be renamed, reordered, and duplicated

  – Support for new issue emails and daily/weekly digest email reports

  – New email notification settings available— to filter recipient domains, set a custom “From:” address, and include server information