what are the build phases available in Xcode?
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What is the difference between atomic and nonatomic properties? Which is the default for synthesized properties?
Which is the framework that is used to construct application’s user interface for ios?
What are layer objects?
Difference between coredata & sqlite?
What is urlsession?
What performance issues can you face when using coredata?
What are the different delete rules that a relationship can have? Which one takes ownership?
What is messaging? How does the runtime handle message passing?
Please explain what is difference strong and weak reference?
What are the different store migration options? When are they used? How do they work? What is mapping model?
Bundle & document directory, sandbox ?
Is core data is thread safe?