Xcode6.3ではSwiftとObjective-Cの連携を強化するために、Objective-Cの新機能としてnullabilityアノテーションが導入されました。 In previous Xcode releases, some Apple frameworks had been specially audited so that their API would show up with proper Swift optionals. Xcode 6.3 supports this for your own code with a new Objective-C language feature: nullability annotations.Swift blog NullabilityとObjective-C Swiftの特徴の一つとして、Objective-Cのコードと透過的に
![NullabilityとObjective−C | 人生と仕事を楽しむブログ](https://cdn-ak-scissors.b.st-hatena.com/image/square/6e926979947aab3c4da8732fdd20bd9d58b20701/height=288;version=1;width=512/http%3A%2F%2Fi1.wp.com%2Fblog.andgenie.jp%2Fwp-content%2Fuploads%2F2014%2F09%2Fswift.png%3Ffit%3D128%252C128)