What is ios closure?
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what is singleton class? Why the whole application creates a single instance?
what are the controllers are available in objective C
Explain the difference between nil and nil?
What is datasource in ios?
what is the use of PO command in Xcode?
What is the first responder?
What is arc and how is it different from autorelease?
Can we adjust the size of photos uploaded from the app?
What is lazy loading?
What is the difference between stack and heap?
What is retain counts?
What is ios architecture?