[置顶] Xcode 7.3 cannot create __weak reference in file using manual refrence counting

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

去build settings 输入weak ，搜索出来Apple LLVM 7.1 - Language - Objective C -> Weak，然后把NO改为YES即可。

原文链接http://stackoverflow.com/questions/36147625/xcode-7-3-cannot-create-weak-reference-in-file-using-manual-reference-counting

或者去target找到你的保错的文件，然后后面写上"-fobjc-arc"即可