Bad idea

[Tangdixi]

Using the ViewController as the delegate, instead of the sub content views does not make any sense.
Any the sub content view's origin delegate implementation gone, you have to move all of them into the ViewController.
That's a disaster

[LustySwimmer]

@Tangdixi It's only an example for embed scrollview, the main thought is to show how to arhieve this effect, anyone who use it in project should reconstruct all the code again