What is the difference between retain & assign in iOS operating system?
How can we use NSOperation queue? what is the advantage of using it ?
What NSAutorelease pool
What are moments and collections?
Whats the difference between frame and bounds?
What is a view controller in ios?
What are “strong” and “weak” references? Why are they important and how can they be used to help control memory management and avoid memory leaks?
What is the difference between 'assign' and 'retain' keyword?
How respond to state transitions on your app in ios?
Is ios 9 still supported by apple?
What is use of nsoperation? How nsoperationque works?
How core data works to save data in persistent storage?
Explain code signing in ios?