ios SDK更新

SDK Version Issue - This app was built with the iOS 11.1 SDK. Starting March 2019, all iOS apps submitted to the App Store must be built with the iOS 12.1 SDK or later, included in Xcode 10.1 or later.

SDK版本问题-此应用程序是使用iOS 11.1 SDK构建的。自2019年3月起，提交至应用商店的所有iOS应用程序必须使用iOS 12.1 SDK或更高版本构建，包含在Xcode 10.1或更高版本中。

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