iOS Advanced questions

1. Write a hierarchy of UIButton and UITableView

What keywords do the 2.Cocoa foundation object and the core foundation object convert to? What is the difference between these keywords?

What is 3.KVO? How is the interior implemented?

4. Is it possible to put more time-consuming operations in Nsnotificationcenter? What should be done?

5. When processing multi-threading with Nsoperation and Nsoperationqueue, there are 3 nsoperation a,b,c, which require A/b to execute after the execution of C, how do I do?

6. In non-arc, which objects can be added to the Autorelease keyword, what is the role of it? When is the object modified by Autorelease released?

7 details about the app startup process, starting with the main file. What functions are there in main, what are some parameters, and what is the function?

What does 8CAAnimation do? Write about its hierarchy (mainly by writing down its seed classes)?

9.ios7 before, there are several forms of background execution content, what is it?

10. An ordered sequence m, judging if there are two elements, a, B, and K? How to judge the a,b,c of three elements and the k?

iOS Advanced questions