Recently I updated my iPhone 5s with iOS 12.0. To my surprise, Xcode 9.4 on my Mac High Sierra dose not support iOS 12.0 device. That's hold on my app development.
My first reaction was to install the newest Xcode 10 beta 2 from Apple. The whole package is pretty big, 5GB+. That's OK. I downloaded the package and installed it. After that I was rushing to run my project in Xcode 10 (I did make a copy of the project to an external HD to run, to avoid any mass up). There were not much updates I had to make change in my app codes, however, I got a compiling error.
That was really painful time. The error seems to be related to linkage to iOS frameworks, no thing to do with my codes. I could not figure out what's wrong in Mac library system. Even worse, I could not run Xcode 9.4 with my project neither, with the similar linkage error.
I tried to look into my Mac library and Xcode framework dependencies. Remove and re-add frameworks. Nothing was working. I decided to stop further trying or mass-up. Took a break.
Fortunately, before I installed Xcode 10 beta 2, I checked in all my codes into my code-repository. I had my Mac Time Machine on. I know what is the time when I had the correct and latest working version of my Xcode 9.4, and it was just one day before. By using TM restoration, I finally got my app, in about 3 hours restoration of my Mac, working in Xcode 9.4.
With the successful restoration, I followed an advice from SO, copying iOS 12.0 supported folders from Xcode 10 beta to my Xcode 9.4.
Xcode-beta/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupportTo
/Applications/Xcode/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupportNow I can run my codes from Xcode 9.4 to my iPhone 5s device.
What's adventure and life-saving experience!
References
- SO discussion: iOS 12 not supported by Xcode 9.4
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