Difference between nil and Nil.
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Which are the ways of achieving concurrency in ios?
Explain about iphone application development?
Explain me does ios support multitasking?
What is the difference between retain & assign in iOS operating system?
What is a struct in iOS operating system?
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An app is loaded into memory but is not executing any code. In which state will it be in?
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How can an operating system improve battery life while running an app?
How many types of background modes supported in ios?
What are layer objects in iOS operating system?
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