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经过多次查找，终于找到了解决的办法
直接在 Podfile 添加以下代码：
post_installdo|installer|
## Fix for XCode 12.5
find_and_replace("Pods/FBRetainCycleDetector/FBRetainCycleDetector/Layout/Classes/FBClassStrongLayout.mm","layoutCache[currentClass] = ivars;", "layoutCache[(id)currentClass] = ivars;")
end
end
deffind_and_replace(dir, findstr, replacestr)
Dir[dir].eachdo|name|
text = File.read(name)
replace = text.gsub(findstr,replacestr)
iftext != replace
puts"Fix: "+ name
File.open(name,"w"){ |file| file.puts replace }
STDOUT.flush
end
end
Dir[dir +'*/'].each(&method(:find_and_replace))
end
