How do you define a block?
What is the difference between #import and #include in objective-c?
What is ivar objective c?
What's the difference between a thread safe and a thread unsafe function?
How messaging works in objective-c?
Explain mutable types in objective c programming language?
What is a class in xcode?
Is objective c still used?
What is difference between datasource and delegate?
What is objective c and swift?
Is c and objective c the same?
How declare methods in objective c? And how to call them?
Can I use objective c in swift?
Why do we require class extension?
What is block variable?