What is swift and what is objective-c?
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How can an operating system improve battery life while running an app?
What is uiwindow in ios?
What is grand central dispatch ios?
When an app is said to be in active state?
What are various singleton instances provided by frameworks?
What is use of uiapplication class?
Explain ios switching applications?
Can viewdidload be called multiple times?
Explain the difference between NSOperationQueue concurrent and non-concurrent in iOS operating system?
What is @synthesize in objective-c ?
Can you please explain the difference between nsarray and nsmutablearray?
Explain @property ,@synthesize