What are design patterns in ios?
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What is the concurrency how many ways you know to achieve concurrency?
Assume that your app is running in the foreground but is currently not receiving events. In which sate it would be in?
Explain @synchronized ,@dynamic
What is factory methods ? What is the advantage of using it ?
What is the difference between atomic and non-atomic properties? Which is the default for synthesized properties? When would you use one over the other?
What is delegate and protocol in ios?
What are layers?
Explain the correct way to manage Outlets memory in iOS.
Did you used CLRegion? How its working?
Ellaborate viper architecture?
What is cocoa touch in ios?
Is there any garbage collector concept available in iOS?
Apple iOS 
