What is fast enumeration in iOS operating system?
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What is the use of double question marks (“??”) ?
What does ios mean on my iphone?
Tell me the hierarchy of uibutton.
What is retain in ios?
Arc is compile time or run time feature?
What happens if iapplication object does not handle an event?
What is the maximum byte-size for a push notification to apple server?
Explain the difference between NSOperationQueue concurrent and non-concurrent in iOS operating system?
What is the difference between copy and retain?
What persistent storage core data uses to save data?
What is push notification?
What are the delegate methods of mkmapview?