使用CocoaPods安装Firebase时遇到ARC语义问题求助

Hey there, let's break down why you're hitting that "Google Data Transport ARC Semantic Issue" error and how to fix it.

The core problem here is that Xcode 9.2 is way too outdated. Firebase and its dependency (Google Data Transport) have long since moved on to using compiler features and ARC syntax that Xcode 9.2 doesn't support. Reinstalling pods won't help because you're still pulling the latest versions of these libraries that aren't compatible with your old Xcode version.

Option 1: Upgrade Xcode (Recommended) #

Xcode 9.2 dates back to 2017 and is no longer maintained. It can't support modern library updates, let alone newer iOS features. Firebase currently requires a minimum of Xcode 14.1, but if you need to stick with iOS 11.2 support, upgrading to Xcode 13.0+ will work with slightly older Firebase versions. After upgrading, just run pod install again, and the compilation error should disappear.

Option 2: Lock Firebase to an Older Compatible Version (If You Can't Upgrade Xcode) #

If upgrading Xcode isn't feasible right now, you'll need to pin Firebase to a version that works with Xcode 9.2 and iOS 11.2. Firebase 7.11.0 is one of the last versions that supports Xcode 9.4+ and iOS 11, which should be compatible with your Xcode 9.2 setup (note: you might need to test if any minor syntax tweaks are needed, but it's the closest match).

Update your Podfile like this:

# Uncomment the next line to define a global platform for your project
platform :ios, '11.2'

target 'LittleThinker' do
  # Comment the next line if you don't want to use dynamic frameworks
  use_frameworks!

  # Pods for LittleThinker
  pod 'Firebase/Auth', '7.11.0'
  pod 'Firebase/Firestore', '7.11.0'
end

Then run these commands to clean up old dependencies and install the correct versions:

pod deintegrate
pod clean
pod install

Quick Checks to Ensure Success #

• Make sure you're opening the .xcworkspace file (not the .xcodeproj) after running pod install
• Verify that Objective-C Automatic Reference Counting is set to YES in your project's Build Settings (this is default, but worth double-checking if you've modified settings before)
• The pod clean step ensures you don't have cached old dependency files causing conflicts

内容的提问来源于stack exchange，提问作者Draven