What is gcd in ios?
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Is xcode a framework?
What is the purpose of ios?
Explain commonly ios libraries
What is the difference between cocoa and cocoa touch?
What is synthesize in ios?
What language is ios based on?
What is App Bundle?
Explain the difference between copy and retain?
Define iterator protocol?
What is nsobject in ios?
Is the object retained if I call performSelector:withObject:afterDelay:?
How to handle concurrency problems in core data?