What is thread safe?
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What are the different delete rules that a relationship can have?
What widgets can not do ?
What is called before viewdidload?
What is 1x 2x?
what is protocol? . The use of protocol?
What is the difference between atomic and nonatomic properties?
What is the use of double question marks (“??”) ?
Which object is create by uiapplicationmain function at app launch time?
What performance issues can you face when using coredata?
What is an NSOperationQueue and how/would you use it in iOS operating system?
What is grand central dispatch ios?
What is nsfetchedresultscontroller?