Updated May 10, 2023
Introduction to iOS Interview Questions and Answers
The following article provides an outline for iOS Interview Questions. iOS is one of the most popular mobile operating systems, mainly developed for Apple iPhone users. Apple Inc. designed and developed it. The iPad and iPod Touch were later added to the list of supported Apple iOS devices after it was first launched in 2007 for the iPhone. Every year, iTunes and over-the-air deliver new major versions of the iOS operating system.
Now, if you are looking for a job related to iOS, you need to prepare for the 2023 iOS Interview Questions. Every interview is different as per the various job profiles, but still, to clear the interview, you need to have a good and precise knowledge of iOS artifacts. Here, we have prepared the essential Interview Questions and answers to help you succeed.
Below are the 10 crucial 2023 iOS Interview Questions and Answers frequently asked in an interview.
Part 1 – iOS Interview Questions (Basic)
This first part covers basic Interview Questions and Answers.
Q1. Explain the SpringBoard functionality for iOS.
Answer:
SpringBoard mainly manages the iOS home screen and also launches and bootstraps applications and sets up startup functionalities.
Q2. Explain a few new features of iOS 11.
Answer:
These are the most common iOS Interview Questions asked in an interview.
The new features of iOS 11 are mentioned below:
- IOS 11, users can send money to their friends using the Apple Pay feature.
- In iOS 11, a new App Drawer feature has been introduced by Apple. With the help of this newly redesigned App Drawer feature, users will now be easily able to share the contents through the Message App.
- In iOS 11, Apple has introduced an updated version of Siri with substantial improvements to its previous versions. The new version of Siri will now offer multiple search results and multiple languages translation support in real-time.
- The newly redesigned control center in iOS 11 will now offer the 3D Touch support functionality.
- In iOS11, users can sync the messaging app across different iOS devices. So, if the user deletes a message through iPhone, the same will also be deleted from the synced iPad and Mac and vice-versa.
Q3. Explain the vieDidLoad and viewDidAppear.
Answer:
In the case of viewDidLoad, this is mainly called when the hierarchy loading process for the view controller has been completed and the records have been loaded into memory successfully. Developers can override this method to process the extra initialization on views implemented from nib files.
In the case of viewDidAppear, this is mainly called when the animation process, which is involved in the initial view appearance, has been completed. Developers can override this method to implement tasks that do not interfere with the ongoing animation view process. So, when there is a rapid change in data or view of the animation process, viewDidAppear is an excellent method to implement the system functionalities.
Q4. Explain Completion Handler and Blocks from an iOS perspective.
Answer:
Blocks are a language-level feature implemented along with C and C++ languages. With regard to the methods or functions, these produce distinctive code portions that can be passed. These can be processed later depending on the system’s capabilities and are not limited to real-time executions. It also implements the codes and displays the same in a much cleaner representative way.
Among the different parameters implemented in a method, the completion handler should always remain the last parameter in the list.
Q5. Explain StoryBoard and Programmatic UIView from an iOS perspective.
Answer:
Developers can construct a view and add new views to it programmatically for StoryBoard. They primarily use StoryBoard for quick UI representation based on appropriate design specifications. It also produces the end-to-end visualization of the entire system process. But in the case of a duplicate handling process, StoryBoard implementation becomes challenging to update as per the system functionality.
In the case of Programmatic UIView, it generally possesses a bit longer and more tedious approach than StoryBoard. Here it gives a steadier response to the current code and the corresponding views based on the system functionality. It also develops a branching approach to the fundamental principles present and thus becomes more easily unit testable.
Part 2 – iOS Interview Questions (Advanced)
Let us now have a look at the advanced Interview Questions.
Q6. What are the different types of iOS states?
Answer:
The different types of iOS application states are:
- Idle/Not Running State: In this step, the App should remain idle or not running.
- Active State: In this step, the App should stay moving and should work as per the user inputs and system functionality.
- In-Active State: This step requires the App to remain inactive, which means that it can be executed in the background, but it should not perform any UI-based functionality.
- Suspended State: In this state, the App should remain in balanced mode. Here, the app should not execute any code, and its ongoing execution should remain in exact stop mode.
Q7. Which property returns initialized objects?
Answer:
Atomic properties usually are implemented to receive properly initialized objects.
Q8. Explain App Id and Bundle ID from an iOS perspective.
Answer:
These are some of the more difficult iOS interview questions. The string “App Id” has two parts. In this situation, the participating development team mostly uses it to track the progress of one or more applications. They use the Bundle Id to identify the particular program in question.
Q9. Explain reuseIdentifier.
Answer:
This identifier sorts group parameters to implement identical rows in the UITableView artifacts.
Q10. Explain a few advantages and disadvantages of iOS.
Answer:
Given below are a few advantages and disadvantages mentioned:
Advantages:
- Easy development concerning UI standardization.
- Very smooth operating system, and thus, the quality usually is higher than Android.
Disadvantages:
- Follows higher approval matrix, which leads to rejection of beta versions.
- The size of the apps is generally on the higher side than that of Android OS.
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