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
解决方式：
Build Settings ->
Apple Clang - Language - Objective C->
Weak Referances in Manual Retain Release ->
将NO改为YES
iOS RAC报错Cannot create __weak reference in file using manual reference counting
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转载自juejin.im/post/6971333630115184647
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