What is retain in ios?
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What are selectors in objective-c?
What is protocol in ios swift?
What is the purpose of UIWindow object?
What is foundation framework in ios?
Why do we override drawrect: method?
What is view object in iOS operating system?
Difference between nil and Nil.
What’s the difference between not-running, inactive, active, background and suspended execution states?
Explain your process for tracing and fixing a memory leak iOs?
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What is thread in ios swift?
What is clean architecture ios?
Differentiate between release and pool drain?