Is the object retained if I call performSelector:withObject:afterDelay:?
What is background state in ios?
Explain how to delete images in ios?
What are b-trees?
What are the features of ios?
What is nsmanagedobjectcontext? What are the different concurrency types?
What is 'private', 'protected' and 'public' ?
What is advantage of categories? What is difference between implementing a category and inheritance?
Whats the difference between NSArray and NSMutableArray?
What are the different store migration options? How do they work?
What is latest mac os version?
Is ios written in c?
Tell about block and GCD