xcode12.5+ FBRetainCycle报错问题

升级xcode12.5+版本以后，项目原有MLeaksFinder库中FBRetainCycleDetector文件报错

具体为201行currentClass出现非NSCopying类型报错

    if (layoutCache && currentClass) {

        layoutCache[currentClass] = ivars;

    }

具体修改为：

    if (layoutCache && currentClass) {

            layoutCache[(id<NSCopying>)currentClass] = ivars;

    }

在cocoapod中文件添加以下内容

target...end中添加：

post_install do |installer|

    ## Fix for XCode 12.5

    find_and_replace("Pods/FBRetainCycleDetector/FBRetainCycleDetector/Layout/Classes/FBClassStrongLayout.mm",

      "layoutCache[currentClass] = ivars;", "layoutCache[(id<NSCopying>)currentClass] = ivars;")

end

target...end后添加：

def find_and_replace(dir, findstr, replacestr)

  Dir[dir].each do |name|

      text = File.read(name)

      replace = text.gsub(findstr,replacestr)

      if text != replace

          puts "Fix: " + name

          File.open(name, "w") { |file| file.puts replace }

          STDOUT.flush

      end

  end

  Dir[dir + '*/'].each(&method(:find_and_replace))

end

最后pod install重新打开工程即可...

参考FBRetainCycle官方解决方案