What is category and class extension?
Explain the difference between strong and retain.
What are the Different types of persistent stores?
Why to keep user policies at server side rather on device? : IOS Architect
Which is the default for synthesized properties?
What is difference strong and weak reference ? Explain.
Explain @synchronized ,@dynamic
Why do we override drawrect: method?
If you use location services in your app, will it drain your battery.if yes? How can we avoid?
Difference b/w collectionView & uitableview?
What happens when we invoke a method on a nil pointer?
Compare and contrast the different ways of achieving concurrency in os x and ios.
What is made up of nserror object?
how you can delete a smart group created in Xcode?
What is the ? In swift?