Question

From my understanding both of the following getter methods reference the actual object. So what is the difference between the two?
When and why would you want to use the second getter method?

- (MyObject *)myObject
{
   return _myObject;
}

- (void)getMyObject:(MyObject **)myObject
{
   if (!myObject)
   {
      *myObject = _myObject;
   }
}

Answer 1

你们不会使用第二种方法。

Unless you like confusing people/yourself at a later date by not following the standard conventions.

如果还有另一部分数据可以退还,例如见NSManagedObjectContext,则更有意义。

- (BOOL)save:(NSError **)error

该方法的重要成果是<代码>。缩略语 NSError反对在出现错误时进行检查。

Answer 2

在目标C中,“目标”是个点,因此,物体价值实际上已经与结构参考(如果你想要在目标C的操作时间之间能够携带密码,则带有隐蔽领域的不透明结构)。

So there is no "versus".

第一个例子是YouR。

有一种特殊的情况是,算法需要参考,或指点人,但并不常见。这是你的第二例。

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