ios - How to make search query on certain web site and display it as native app -

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I have an assignment to implement, but after a few thoughts, I do not know where it starts . Need to get:
For example, Take the Bestbay Web site from my app, I would like to prepare a definitive query which will be used / used by me for the best search. On my device, I would like to show it as 10 items of the website that was returned, for example, if I type "TVs" then I get a list of TVs, so I list this for the price and items on my device I would like to show up with a link (for at least 10 first items).
I have experience with basic apps (I did not work with web application).
I can not do use the best purchase API

I do not know where it is starting - I have read about it.
I thought that web pages need to be used as HTML and to parse the needs of the objects. Does anyone do something like this and give me some starting point?
How does this type of problem reach?
(Tutorials / documentation / sample code is something that can help me get started). In the end, I decided to parsing it HTML:

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