Swift Interview Questions and Answers

Last updated on Feb 06, 2023
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Swift Interview Questions

Swift is the latest, open source programming language from Apple, which is very easy to learn. The language is available for developing OS X, iOS, and watchOS apps. Apps built on Swift can be run on devices dating back to iOS 7 or later and OS X 10.9 or later. Swift allows developers to prototype and write apps faster and with fewer bugs than ever before.

 

 

Advantages

  • Safer, faster and more powerful
  • Can co-exist alongside Objective-C
  • Innovative features
  • APIs are easier to maintain and read
  • One of the best ways to code OS X and IOS apps

Most Frequently Asked Swift Interview Questions

Here in this article, we will be listing frequently asked Swift Interview Questions and Answers with the belief that they will be helpful for you to gain higher marks. Also, to let you know that this article has been written under the guidance of industry professionals and covered all the current competencies.

Q1. What are the advantages of Using Swift for iOS Development?
Answer

It is fast, safe, modern, and enables a level of interactivity in development. Swift Programming contains a number of features such as closures, generics, and type inference that make it much easier to use.

  • Safer, faster and more powerful
  • Can co-exist alongside Objective-C
  • Innovative features
  • It offers Interactive Coding styles
  • APIs are easier to maintain and read
  • One of the best ways to code OS X and IOS apps
Q2. What do you mean by a Deinitializer?
Answer

When you are trying to perform extra clean-up of your classes, you can define a block called deinit.
Here is the Syntax:
deinit {
    //Your cleanup statement here.
}

Q3. How is Swift different from Objective-C?
Answer
Swift -
  • No need to finish code with a semi-colon.
  • The syntax is simple and clear.
  • Does not allow multiple inheritance.
Objective-C
  • Need to finish code with a semi-colon.
  • The syntax is difficult to master.
  • Allows multiple inheritance.
Q4. How will you connect Ui?
Answer

UI in Swift are connected similar to the way we do in Objective-C. Binding process is the same, only core level has changed. You can select button/label on xib file and bind as is it.

Q5. What is optional chaining?
Answer

It is a process of querying and calling various properties. You can chain multiple queries together, but if any link is nil, the entire chain will fail.

Q6. How should errors be handled in Swift?
Answer

The way to handle errors in Swift is different from Objective-C. In Swift, you can declare that a function has thrown an error. A function that calls this method must do it from a try block. It is the caller's responsibility to handle the error. This process is quite similar to how we handle errors in Java.

Q7. What is Swift Programming?
Answer

Swift is the latest, open source programming language from Apple, which is very easy to learn. The language is available for developing OS X, iOS, and watchOS apps. It allows developers to prototype and write apps faster and with fewer bugs than ever before.

Q8. What is the latest version of Swfit Programming?
Answer

Swift 5.0

Q9. Is "Swift" a good programming language? Explain
Answer

Yes, It is a very powerful, intuitive open source programming language developed by Apple for iOS, macOS, watchOS, tv OS, and Linux etc.

Q10. What are functions different from methods?
Answer

Functions

  • Self-contained code that performs a specific task.
  • Identified by their name to call whenever a task is required.
  • To declare a function, use func.
  • Use . -> to separate function parameters parenthesis and return type.

Methods

  • Associated with a particular type.
  • The first parameter name is given by default.
  • Enumeration and Structure define methods.
Development History

Apple started working on Swift in 2010. Swift is said to be more than two times faster than its rival Objective-C, and more than eight times faster than Python. The first version of Swift was released in September 2014.

Latest Version: Apple announced the release of Swift 5.0.

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