What is difference between unit tests and ui test in xcode?
Why do we override drawrect: method? How to explicitly call it?
Explain difference between mrc and arc?
What are layers?
What is nsmanagedobjectcontext? What are the different concurrency types?
What is thread safe?
How many types of background modes supported in ios?
How we can execute some code when app is in background?
How you can add frameworks in xcode project?
What is a difference between stack and heap memory?
What are different instruments xcode supports for app profiling?
What do you mean by rest?
What is the difference between strong and retain.
How to animate view with constraint?
What is the difference between weak and strong?