64-bit and iOS 8 Requirements for New Apps
新提交的iOS8 App，64位成为必选项， 2015年2月1号生效
October 20, 2014
Starting February 1, 2015, new iOS apps uploaded to the App Store must include 64-bit support and be built with the iOS 8 SDK, included in Xcode 6 or later. To enable 64-bit in your project, we recommend using the default Xcode build setting of “Standard architectures” to build a single binary with both 32-bit and 64-bit code.
根据提示，只要如下设置64位支持
