Is core data is thread safe?
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Compare and contrast the different ways of achieving concurrency in os x and ios.
Explain me what is polymorphism?
What is messaging? How does the runtime handle message passing?
What are “strong” and “weak” references? Why are they important and how can they be used to help control memory management and avoid memory leaks?
What are the ios devices?
Define 'atomic' keyword?
What is difference between category and extension in ios?
What is strong weak in ios?
What are the features of ios?
What are the different types of ios application states?
How to switch off predictive text?
What is a delegate xcode?