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iOS & Swift Interview Questions

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Need to practice your iOS and Swift skills for an upcoming job interview? Try solving these iOS interview questions that test knowledge of iOS APIs, the Swift programming language, and mobile development concepts. We’ll provide feedback on your answers, and you can use a hint if you get stuck.

These iOS interview questions are examples of real tasks used by employers to screen job candidates for mobile development jobs that require knowledge of the iOS environment in order to create and maintain iOS applications.

1. UITableView

Easy  
iOS UI Public

Select the components that are minimally required for constructing and configuring a UITableViewController, which can be used to view (but not manipulate) a list of items.

(Select all acceptable answers.)

Solve Question

2. View Controller

Easy  
iOS Event handling UI Public

Which of the following statements are true for UIViewController?

(Select all acceptable answers.)

Solve Question

3. Car

Easy  
Swift Language Public

Consider the following Swift definition of the structure Car:

struct Car {
    var color:UIColor?
    let model:String
    
    init(model:String) {
        self.model = model
        self.color = nil
    }

    mutating func changeColor(color:UIColor) {
        self.color = color
    }
}

Select the statements that are correct.

(Select all acceptable answers.)

Solve Question

4. Events

Easy  
iOS Event handling Public

Which of the following statements are true for user interface events in iOS?

(Select all acceptable answers.)

Solve Question

5. User Subscription

Easy  
Swift Memory management New Public

An application uses the User and Subscription classes for tracking all subscriptions that a user has purchased. Currently, the memory occupied by instances of those classes is never reclaimed.

Without changing the public API, fix the memory leak.

Solve Question

6. Two Sum

Easy  
Swift Algorithmic thinking Dictionary New Public

Write a function that when passed an array and a target sum, returns, efficiently with respect to time used, two distinct zero-based indices of any two of the numbers whose sum is equal to the target sum. If there are no two numbers, the function should return nil.

For example, findTwoSum([ 3, 1, 5, 7, 5, 9 ], 10) should return a single dimensional array with two elements and contain any of the following pairs of indices:

  • 0 and 3 (or 3 and 0) as 3 + 7 = 10
  • 1 and 5 (or 5 and 1) as 1 + 9 = 10
  • 2 and 4 (or 4 and 2) as 5 + 5 = 10
Solve Question

7. Readable Object

Hard  
Swift OOP Protocols New Public

Change the Readable protocol and the ReadableObject and EmptyReadableObject classes so that:

  • ReadableObject and EmptyReadableObject implement the Readable protocol.
  • When the read method is called on the ReadableObject class, it returns the value that it received in the constructor.
  • The isReadable method returns true in the ReadableObject classand returns false in the EmptyReadableObject class.
Solve Question

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