Explain layer objects?
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Which class will be subclassed in iOS operating system?
Define fast enumeration?
How nsoperationque works?
Arc is compile time or run time feature?
Explain parent-child context setup. How does it work?
Which framework delivers event to custom object when app is in foreground?
Where can you test Apple iPhone apps if you don’t have the device?
What are the differences between categories and extensions?
Explain the difference between frame and bounds?
Why do you generally create a weak reference when using self in a block?
When to use nsmutablearray and when to use nsarray?
How do you stop apps running in the background on ios?