How respond to state transitions on your app in ios?
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what is navigation controller?
How to start a selector on a background thread.
Please explain what is difference strong and weak reference?
Explain me what is polymorphism?
What are the functions of managed object context?
How can an operating system improve battery life while running an app?
Different types of persistent stores? Which all types can we have on ios?
What is singleton class in ios?
Tell about block and GCD
How to handle concurrency problems in core data?
What is id in ios?
Define decoding or deserialization and encoding or serialization?