Appleは本日、macOS用の統合開発環境「Xcode」のメジャーバージョンアップ版「xcode 9」の正式版を公開しました(MacRumors)。macOS 10.12.6以降に対応し、Mac App Storeを利用して最新版に更新することができます。
Xcode 
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Apple公式開発ツール。
Xcode 9はSwift 4に対応し、最新プラットフォームであるiOS 11、watchOS 4、tvOS 11、macOS High Sierra 10.13用のSDKを含んでいます。
SwiftやObjective-Cに対応するリファクタリング機能の改良、コードエディタの高速化、Fix-itsの改良、新しいソースコードナビゲーター、iOSアプリとtvOSアプリに対応したワイヤレスインストール・デバッグ機能の搭載など多数の新機能も追加されています。
リリースノートは以下の通り:
Xcode 9 includes Swift 4 and SDKs for iOS 11, watchOS 4, tvOS 11, and macOS High Sierra 10.13
- Refactoring makes it easy to modify the structure of Swift, Objective-C, C, and C++ code
- Code editor is blazingly fast and responsive and adds native support for Markdown syntax
- Fix-its apply multiple improvements to your code in a single click, and can even add required protocol methods
- New Source Control navigator and integrated GitHub accounts make it easy to manage code across a team
- Wireless installation and debugging for iOS and tvOS apps on devices over the network
- Simulator looks and behaves more like a real device and can simulate multiple devices at a time
- iOS playground templates create documents that work in both Xcode and Swift Playgrounds on iPad
- Find navigator is incredibly fast and results show up instantly
- Project navigator automatically keeps files and groups in sync with Finder and source control
- Xcode Server no longer requires macOS Server and can be fully configured in Xcode preferences
- Next-generation build system improves reliability and performance when building many projects (optionally enabled)
- Swift 4 compiler can also build Swift 3 code to enable staged migration, one module at a time
- Latest SDKs include the Core ML framework for machine learning and ARKit for augmented reality
