Enlist the methods to achieve concurrency in ios?
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Explain how the push notification works in iOS operating system?
Can a "delegate" retained in ios?
How do you stop apps running in the background on ios?
Which is the super class of all view controller objects?
What is push notification?
Which devices will this work with ios?
Explain me what is "delegate"?
What are the limits of accessibility ?
Whats the difference between NSArray and NSMutableArray?
What happens when you invoke a method on a nil pointer?
What are the different store migration options? When are they used? How do they work? What is mapping model?
How to parse json?