iOS 运行RAC报错Cannot create __weak

旧项目增添RAC时无法在手动计数文件中创建弱引用，出现以下报错 Cannot create __weak reference in file using manual reference counting

Cannot create __weak reference in file using manual reference counting

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解决方式：

Build Settings ->
Apple Clang - Language - Objective C->
Weak Referances in Manual Retain Release ->
将NO改为YES

解决路径