15.内存管理默认的关键字是什么？

MRC

@property (atomic,readWrite,retain) UIView *view;

ARC

@property (atomic,readWrite,strong) UIView *view;
如果改为基本数据类型，那就是 assign。

转自：https://github.com/liberalisman/iOS-InterviewQuestion-collection/blob/master/%E5%86%85%E5%AD%98%E7%AE%A1%E7%90%86/15.%E7%AC%AC%E5%8D%81%E4%BA%94%E9%A2%98.md