iOS property's synthesized getter follows Cocoa naming convention for returning 'owned' objects

property's synthesized getter follows Cocoa naming convention for returning 'owned' objects

在刚才写小demo时发现以上错误，经过上网查看资料之后，发现这是因为苹果在新的编码时，不推荐变量以new、copy等关键字开头，希望能提醒自己和大家在以后编码的时候多加注意