Nullability and Objective-C

_Nullable: pointer may have a NULL or nil value   while a _Nonnull one should not. The  
compiler will tell you if you try to break the rules.

参考链接

Nullability and Objective-C
Objective-C 中 nullable、__nullable、_Nullable 的区别

    原文作者:诺颜110
    原文地址: https://www.jianshu.com/p/9fe00fcb61ac
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