来自Apple的将应用程序提交到App Store ：

从2018年4月开始，提交所有新的iOS应用程序到App Store必须使用iOS 11 SDK构建
。

Starting April 2018, all new iOS apps submitted to the App Store must be built with the iOS 11 SDK.

和相关的（较旧但可能有用）技术说明：

And a related (older but probably useful) Technical Note:

Xcode使用
最新的SDK强制构建每个项目是不切实际的。例如，可能需要发送即时
热修复版本的应用程序 - 无需等到应用程序完全为
更新为更新的SDK。

It is not practical for Xcode to force every project to build with the latest SDK. For example, it may be necessary to ship an immediate hot-fix version of app - without waiting until the app has been fully updated for a newer SDK.

但重要的是要了解使用较旧的SDK是
临时解决方法，而不是解决方案。应尽快修复使用最新SDK阻止您的应用程序
的问题。这将是
更容易解决这些问题，而较旧的构建系统仍然支持
。

But it's important to understand that using an older SDK is a temporary workaround, not a solution. Issues preventing your app from using the latest SDK should be fixed as soon as possible. It will be much easier to fix these issues while the older build system is still supported.

重要：不会无限期地支持Legacy SDK版本。

Important: No Legacy SDK version will be supported indefinitely.