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Lose call flow in mediator example

1

In Mediator case, just have the MessageMediator broadcast the message to all Programmers. But In GOF, mediator structure like below:  Apparently, programmers need to communicate with each other, so...

49. KVC和KVO的keyPath一定是属性么？

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`KVO支持实例变量` 不应该是`KVC支持实例变量`吗？KVO只支持属性

func reuse tip

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Why the [L658-L663](https://github.com/Instagram/IGListKit/blob/master/Source/IGListAdapter.m#L658-L663) in IGListAdapter.m can't coding the following: ``` [self _updateBackgroundViewShouldHide:![self _itemCountIsZero]]; ```