iOS and Swift Developer Interview Questions and Answers

Sample Swift iOS Developer Interview Questions

Q1. Which of the following is used to create a mutable object?

1. Var
2. Let
3. Both a & b
4. Neither a or b

Ans: a. Var

Q2. What keyword is used to create Constants in Swift?

1. Constants
2. Let
3. Conts
4. None of the above

Ans: b. Let

Q3. Which JSON framework is supported by iOS?

Ans: SBJson framework is supported by iOS.

Q4. Elaborate on the differences between Swift and Objective-C.

Ans: Differences between Swift and Objective-C are as follows:

• Swift is an object-oriented, functional programming language, whereas Objective-C is a class-based object-oriented programming language
• Swift supports dynamic libraries, whereas Objective-C does not
• Swift supports Tuples which is not the case with Objective-C
• Semicolons are required in Objective-C, whereas they are not necessary in Swift.
• Swift is an open-source programming language, whereas Objective-C is not and in addition, its use is limited to Apple products alone.
• Swift allows the definition of methods in structure, classes or enumeration, whereas Objective C does not allow it.
• Swift allows defining classes in a single file (.swift), whereas in Objective C needs the creation of separate files for interface (.h) and for classes and implementation (.m).

Q5. Where can the apple iPhone apps be tested in the absence of iOS devices?

Ans: In case of unavailability of an iOS device, the application can be tested on simulators provided by Apple on the Mac system.

Q6. What are the tools that are required to develop iOS applications?

Ans: Some of the essential tools required to develop iOS applications are Mac/MacMini, Xcode, Apple developer program and Swift programming language.

Q7. What is a dictionary?

Ans: Dictionaries are an association of an unordered collection of key-value pairs wherein each value is associated with a unique key of hashable type such as a number or string. Dictionaries are used in Swift programming to obtain the values based on a key value.

Defining a dictionary in Swift:

Dictionary<Key, Value> ()

Or

[Key: Value] ()

Creating a dictionaries in Swift:

// using Dictionary

Var names = Dictonary<String,Int> ()

Names = [“Arpit”: 1, “Sujit”: 2]

print(names)

// it prints [Arpit: 1, Sujit: 2]

Q8. Which of the following is used to return multiple values in Swift from Function?

1. Array
2. Tuple
3. Double
4. None of the above

Ans: b. Touple

Q9. In which iOS version was multitasking introduced?

1. iOS 2.0
2. iOS 4.0
3. iOS 7.0
4. iOS 6.0

Ans: b. iOS 4.0

Q10. Choose the command that is used for displaying the syntax for the clock command?

1. clock?
2. cl?
3. clock ?
4. cl ?

Ans: c. clock ?

Applications of MeritTrac Assessment Solutions

With the help of MeritTrac’s end-to-end assessment solutions, recruiters can measure the skills and knowledge of the candidates in Swift and select the right talent for a face-to-face interview. They can have a list of Swift interview questions to further assess the capability and suitability of the candidates for the job role.

The learning and development department can use MeritTrac’s assessment solutions to evaluate the skills of the existing developers. The results of the assessment can help them design training programs to fill skills gaps if any.