对应基本数据类型默认关键字是
atomic,readwrite,assign
对于普通的 Objective-C 对象
atomic,readwrite,strong
参考链接:
Objective-C ARC: strong vs retain and weak vs assign
对应基本数据类型默认关键字是
atomic,readwrite,assign
对于普通的 Objective-C 对象
atomic,readwrite,strong
参考链接:
Objective-C ARC: strong vs retain and weak vs assign