小胖说事24-----property's synthesized getter follows Cocoa naming convention for returning 'owned' objec

今天在给类的属性命名的时候，用了newValue。就给报错：property's synthesized
getter follows Cocoa naming convention for returning 'owned' objects，一阵郁闷不知道咋回事，后来查了资料后，原来是命名规范的事情：

You own any object you create

You create an object using a method whose name begins with “alloc”, “new”, “copy”, or “mutableCopy” (for example, alloc, newObject,
or mutableCopy).

一定要注意命名规范，不能以alloc，new，copy。mutableCopy 作为开头命名。比方：newValue。

留此做个笔记。纪念一下。