Cannot create __weak reference in file using man
如果，当你升级到xcode 7.3 后 发现遇到如下问题： cannot create __weak reference in file using manual reference counting __cpt_weak UIPinchGestureRecognizer *pinchGestureRecognizer;
那么，可以设置build setting -> Apple LLVM7.1 - Language - Objective C -> Weak References in Manual Retain Release YES或者用unsafe_unretained代替weak
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