iOS9.3 __weak reference

本文主要是介绍iOS9.3 __weak reference，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

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,但是如果用__unsafe_unretained 请注意下面的问题。

__unsafe_unretained specifies a reference that does not keep the referenced object alive and is not set to nil when there are no strong references to the object. If the object it references is deallocated, the pointer is left dangling.

感谢观看，学以致用更感谢。

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