iOS and Objective-C

Mobile Development

About this test

The Kandio Method

Kandio’s assessment tests let you assess the candidates, employees, agencies or freelancers you have concerning any iOS and Objective-C tasks that you might have.

Remember that Kandio offers guidelines on which programmers to proceed with, and which ones to discard. Kandio will give you reliable directions about things programmers should know about, but a programmer can be excellent, even if he does not know about all of these things.

We suggest that you use our tests before your interview process to know which ones actually to talk to. The final Kandio report should be a piece of conversation with the strong candidates, rather than a disqualifying process in a late stage interview process.

The test and how it’s structured

In recent years, Objective-C has gained momentum with the rapid expansion of Apple’s product range. If you’re looking for a developer, who needs to touch software iOS or OS X, knowing Objective-C is a must.

Read on, if you want a brief background explanation of the Objective-C language.

Objective-C is the critical programming language utilized when composing apps and software used in OS X and iOS. While the C programming language builds the foundation, Objective-C is perceived as a sort of extension that enables your candidate to work with object-oriented capabilities and a dynamic runtime. 

Even though the combined list of extensions isn’t significant, tourough understanding is required to unlock the full abilities of all the powerful extensions. Put together, the object-oriented programming, that Objective-C enables, will improve the functionality and capability of the app dramatically.

Objective-C mimics the syntax, primitive types, and flow control statements of C while adding the syntax for defining classes and precise methodology. Furthermore, Objective-C includes and helps with multi-language-level support for specific object graph management and object literals while providing dynamic typing and binding, deferring many responsibilities until runtime.

When you use our Objective-C test for recruiting employees,

  1. Foundation – The Foundation framework provides the absolute crucial stepping stones for any app to be build upon. Hence why we find it essential to include in our test.
  2. Concurrency – App developers need increasingly new ways to ensure they utilize computer power to the fullest. We test your candidates in concurrency, because of the increasing demands of things happening simultaneously in an app.
  3. Objective-C Language – The language has many basic features. We are taking your candidates around in some of the most important.
  4. Memory Management, ARC – Your candidate needs to know about not only allocating processes to the computer memory. He also needs to confidently utilize and free up the memory again after the task is finished. We will test him in this area.
  5. UIKit, Operating System – There are many significant user interface features. And the user interface is some of the most critical when using Apple products. Every line and button needs to be well thought through. Here, we open this giant box of possibilities and assess your candidate in this area.




Maximum completion time

40 minutes

Chapter(s) 5
  • Foundation
  • Concurrency
  • Objective-C Language
  • Memory Management, ARC
  • UIKit, Operating System
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Try a sample question from our iOS and Objective-C specialist
Does the following code cause a retain cycle? If so, why? If not, why not?

iOS & Objective C

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94% of all questions our support receives, can be answered in the below FAQ

I have many candidates - will they all receive the same questions for equal assessment?
Short answer:

Yes, all candidates are equally assessed, when you use Kandio.

Long answer:

All our tests have different questions that might or might not change from vacancy to vacancy.

However, once you lock a recruitment round in, the questions will lock in as well for all candidates going through your assessment, so that they are equally screened.
How can the exam score help me to make a better hiring decision?
Overall it would be best if you kept in mind that Kandio offers help with assessing your total pool of candidates. The point with this plan-of-attack is to give you a tool that will enable you to pinpoint the very underqualified candidates quickly, and promptly discard of them. As well as locating the strong candidates, and invite them for an interview before your competitor does.

The difficulty of our tests is serious in general and is meant to find the lesser qualified. So you shouldn’t disqualify a candidate at 67%, just because you have someone who’s testing 70%. Or even 85%.

Kandio is a tool you should use in addition to other means such as:

- Common sense
- Gut feeling
- Internal screening
- Other assessment tools from Mandomedio
- Experience of the candidate
- Career goals of the candidate

The reason we have priced Kandio the way we have is that it’s meant to be used alongside other decision factors, and not as a sole dictation of which candidate to employ.
Why Kandio over other tests? And why not a free-writing test?
All Kandio assessments have a difficult multiple-choice approach and a very clear and tangible scorecard at the end. We only work with objective measurements and completely disregard candidate values such as consistency in work, ability to teamwork, humanity, and care for colleagues, sociality, and the likes.

The reason for this is that in today's tech-oriented world, we often see a significant amount of different solutions to the same problem. If we offered free-write assignments, candidates would need to be assessed one by one, which obviously would be impossible at our price point.

With us, you're buying access to a robust set of exams, written by the world's best authorities, with well-functioning scorecards to make recruitment easier. And on top of that, we are using big-data to benchmark all your candidates across other similar candidates.
How difficult are the tests Kandio offers my candidates?
All our tests are authored with serious difficulty in mind. We accept only the best test authors onto our platform, and a fixed percentage of revenue goes directly to our authors to keep content updated, and authors happy.

Our goal is to weed out the least competent candidates in the most common knowledge within your desired field.

Because of this, you should keep in mind to adjust your salary expectations and level of acceptance, if you’re looking for junior roles, mid-level roles, or senior roles.
How do I adjust the level of my test to match the qualifications of the position I’m trying to fill within my company?
You don’t. Our tests are made with such difficulty in mind, that they would challenge all skill levels regardless of seniority. We almost never see any candidate getting everything correct on our exams.

If you are trying to fill a senior role, you would probably want candidates to score above 60% in Kandio. If you’re looking for a junior role, you could probably settle with 30%-50%

If you want a very junior role, that you can train along the way, you would be looking at 30%-50%.

We wouldn’t recommend considering any candidate below 20% unless you have clear indications from other factors of decision making.