Objective C Interview Questions and Answers
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Best Objective C Interview Questions and Answers
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Q1) Explain what is basically Objective C?
Answer: The primary programming language that is used to build and develop mobile smartphone applications is known as Objective C. This is used both in Android and IOS technologies.
Q2) Who were the inventors of Objective C?
Answer: The inventors of Objective C were Tom Love and Brad Cox.
Q3) When was this invented?
Answer: Objective C was invented in the 1980s.
Q4) What was the name of their company?
Answer: The name of the company where Objective C was invented was known as Stepstone.
Q5) State the latest version of Objective C.
Answer: The most upgraded version of Objective C was launched by the company Apple … Objective C 2.0
Q6) In which year was the latest version of Objective C released?
Answer: The year in which the latest version of Objective C was discovered was 2006.
Q7) In which tech conference was the latest version launched?
Answer: It was launched at the Worldwide Developers Conference.
Q8) State the two types of protocols it encompasses.
Answer: The two different types of protocols Objective C encompasses are … formal and informal.
Q9) What are categories used for?
Answer: In order to add methods to an already existing class, a category is needed. Categories are also used to disseminate implementing their respective classes into individual source files.
Q10) What is the key difference between NSArray and NSMutableArray?
Answer: Static arrays are created by the former and the creation of dynamic arrays is by the latter.
Q11) What property does @synthesize achieve?
Answer: When a developer needs to specify attributes or characteristics to certain variables, one uses @synthesize. This also helps generate better and setter for the variables involved.
Q12) What kind of class is NSObject?
Answer: This is the root class. A lot of other classes stem from this. NSObject defines the basic behavior patterns for object interactions.
Q13) State the key difference between atomic and non-atomic synthesized properties.
Answer: The former is the default set behavior pattern. The latter is not the default behavior and the consequences of the same might be potentially unexpected.
Q14) State the full form of GCD.
Answer: The full form of GCD is Grand Central Dispatch.
Q15) What is the function of GCD?
Answer: The main advantage of creating a GCD is that only one thread is developed to execute the blocks and the execution of the same happens sequentially. Hence there is nothing unexpected to preempt.
Q16) State the full forms of KVC and KVO?
Answer: The full form of KVC is Key-Value Coding and the full form of KVO is Key-Value Observing.
Q17) What are the properties of Key-Value Coding and Key-Value Observing?
Answer: The main advantage of Key-Value Coding is that it allows accessing any value using a string. When programmers need to decipher a change or a modification in their properties they use Key-Value Observing as it allows them to do so.
Q18) What do you understand by blocks?
Answer: Blocks is the name given to language level features.
Q19) How are blocks used?
Answer: Blocks are used to create code segments that are cascaded to functions to be utilized as values. The caret symbol is the syntax that is used to define a block.
Q20) What do you understand by the responder chain?
Answer: A sequential series of responder objects that are linked together are known as a responder chain. In this case also, if the first responder is unable to execute the command, it is passed onto the next in line and so on and so forth till it reaches the last responder in the chain.
Q21) State some advantages of utilizing Objective C.
Answer: Some advantages of utilizing Objective C are as follows… it has documented frameworks, it has strong online support, it is a stable language, it works smoothly with C and C++ and it is a time tested and mature language.
Q22) What do you understand by id?
Answer: A pointer to any type is called id.
Q23) Is there a possibility of function overloading in Objective C?
Answer: No there is no possibility of function overloading in Objective C.
Q24) What do you understand by a delegate?
Answer: A delegate is an object that co-coordinates for or on behalf of other objects during a program run.
Q25) Can delegates be retained? Is it advisable to do so?
Answer: Yes, delegates can be retained. However, it is not considered advisable to do so.
Q26) Why does dispatch_once run only once?
Answer: Dispatch_once is an asynchronous process. Hence it can perform one task only once. It is not built for multitasking purposes.
Q27) State the methods in which memory is allocated in Objective C.
Answer: Memory is allocated in two ways in Objective C. They are … manual retail release (MRR) and automatic reference counting (ARC).
Q28) What are some of the attributes of properties in Objective C?
Answer: Some of the attributes of properties in Objective C are as follows…copy, retain, assign, re-write and read-only.
Q29) Can ARC and Non-ARC codes be used together in projects?
Answer: Yes, they can be used together as well.
Q30) State some of the methods for using NSURL connections.
Answer: Some of the methods for using NSURL connections are as follows…when the connection receives the response, when the connection receives the data, when a connection fails and shows the error and when the connection finishes loading.