升级Xcode 7.3 RAC cannot create __weak reference in file using manual reference counting
设置Build Settings -> Apple LLVM 7.1 - Language - Objective C -> Weak References in Manual Retain Release 设置为YES.
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设置Build Settings -> Apple LLVM 7.1 - Language - Objective C -> Weak References in Manual Retain Release 设置为YES.
刚需，正要设置一下呢