What is category in ios?
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what are the controllers are available in objective C
What is singleton in ios swift?
What is the first responder?
What are the important delegate methods of nsxml parser?
What are the delegate methods of mkmapview?
Explain the difference between strong and retain.
How are non-atomic and atomic properties different? Which one is the default property for synthesized properties? When would a user operate one over the other?
Is appdelegate a singleton?
Mention what is the use of po command in xcode?
When dealing with property declarations, what is the difference between atomic and non-atomic?
Explain "private", "protected" and "public"?
Explain how do I get a call when my ipad rings?