Explain application sandboxing.
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Explain the difference between nil and nil?
Explain how to delete images in ios?
What is gcd? How is it used?
What is the difference between atomic and non-atomic properties? Which is the default for synthesized properties? When would you use one over the other?
What is @dynamic in objective-c ?
Define 'retain' keyword?
What are layers?
Explain the difference between stack and heap memory?
What is the concurrency how many ways you know to achieve concurrency?
Will iphone 6 get ios 13?
When would you say that an app is not in a running state?
how push notification works?