Un-Answered Questions { Apple iOS }

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

407


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

397


Explain difference between mrc and arc?

475


What are layers?

473


What is nsmanagedobjectcontext? What are the different concurrency types?

406


What is thread safe?

449


How many types of background modes supported in ios?

416


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

417


How you can add frameworks in xcode project?

398


What is a difference between stack and heap memory?

393


What are different instruments xcode supports for app profiling?

420


What do you mean by rest?

453


What is the difference between strong and retain.

393


How to animate view with constraint?

441


What is the difference between weak and strong?

465