What is a category and when is it used?
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Define 'weak' keyword?
Why we use delegate in ios?
How to represent layer objects in iOS operating system ?
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Explain parent-child context setup. How does it work? What are the advantages?
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What are layer objects and what do they represent?
What is a memory leak in ios?
What is an ios framework?
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Why do all model object attributes get marked with @dynamic and not synthesised? What does @dynamic mean?
How can we prevent ios 8 app’s streaming video media from being captured by quicktime player on yosemite during screen recording?
Why do we override drawrect: method? How to explicitly call it?