Un-Answered Questions { Apple iOS }

What is difference between unit tests and ui test in xcode?

401


Why do we override drawrect: method? How to explicitly call it?

383


Explain difference between mrc and arc?

466


What are layers?

463


What is nsmanagedobjectcontext? What are the different concurrency types?

394


What is thread safe?

441


How many types of background modes supported in ios?

408


How we can execute some code when app is in background?

405


How you can add frameworks in xcode project?

391


What is a difference between stack and heap memory?

385


What are different instruments xcode supports for app profiling?

402


What do you mean by rest?

441


What is the difference between strong and retain.

385


How to animate view with constraint?

437


What is the difference between weak and strong?

455