Please explain what is difference strong and weak reference?
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What is lazy loading?
What are the different store migration options? When are they used?
Which are the ways of achieving concurrency in ios?
What is use of uiapplication class?
What are selectors in objective-c?
What is abstract class in ios?
What are the three themes that ios embodies?
What is factory methods ? What is the advantage of using it ?
Explain application states
What is 1x 2x and 3x in ios?
Explain app id?
When is an app said to be in active state?