Set Build Settings -> Apple LLVM 7.1 - Language - Objective C -> Weak References in Manual Retain Release to YES.

Taken from Apple Developers Forums - Xcode 7.3b4, non-arc, cannot create __weak reference.
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Set
Taken from Apple Developers Forums - Xcode 7.3b4, non-arc, cannot create __weak reference. |
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Xcode 7.3 cannot create __weak reference in file using manual reference counting
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原文地址:http://www.cnblogs.com/Camier-myNiuer/p/5601569.html
-Wall -Wextra -Wno-unused-parameterWarning flags enabled. – Kdawgwilk Mar 24 at 5:45