What is difference between unit tests and ui test in xcode?
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What is difference between performblock: and performblockandwait:?
Bundle & document directory, sandbox ?
What is nsmanagedobjectcontext? What are the different concurrency types?
What is iphone sdk?
What is App Bundle?
What are the 7 osi layers?
Assume that system is running low on memory. What can system do for suspended apps?
Explain about Viewcontroller lifecycle.
What is synchronous vs. Asynchronous in gcd ?
What is appdelegate?
What is @implementation?
Please explain what is difference strong and weak reference?