Real machine testing is an essential step in the development process. According to Apple's ideas, if you want to debug iOS 9.3, you must upgrade Xcode to version 7.3, but anyone who has used Xcode 7.3 knows that the smart tips of version 7.3 do It is really inconvenient to use, so most people may still be using version 7.2. In fact, using Xcode7.2 can also debug iOS9.3 system.
There is a folder for supporting system debugging in our Xcode directory: right-click the Xcode program to display the package content->Contents->Developer->Platforms->iPhoneOS.platform->DeviceSupport. Comparing the 7.2 and 7.3 versions, it is found that there is a folder called 9.3 (13E230) in the 7.3 directory. This folder is used to support the debugging of iOS9.3 devices, so what we need to do is in the 7.3 installation directory. Copy this folder out, and then put it in this directory of your 7.2 and it will be OK, so you can use Xcode7.2 to debug the iOS9.3 system
