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71 interview questions on Objective-Cfor developers (2025)

Test your technical skills before an interview of Objective-C with 71 corrected questions. Beginner, Intermediate or Expert level.

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71 questions
Expert
1 vote21 runs0 comment

What is the keyword to use to avoid retain cycles in Objective-C?

Mobile developer
objective-c
weak
Smart&Softat Nov 3, 2021
Hard
0 vote72 runs0 comment

What is the name of the framework that provides 2D and 3D graphics?.

Mobile developer
QuartzCore
Smart&Softat Nov 3, 2021
Expert
0 vote50 runs0 comment

What is the output of the following code? #import <Foundation/Foundation.h> int main(int argc, const char * argv[]) { @autoreleasepool { // insert code here and press return to continue NSLog(@"%@", SQLite); } return 0; }

Mobile developer
sqlite
binary
Smart&Softat Nov 2, 2021
Medium
0 vote34 runs0 comment

What is the best way to run a block of code on a background thread in Objective-C?

Mobile developer
dispatch queue
grand central dispatch
Smart&Softat Nov 2, 2021
Hard
0 vote34 runs0 comment

Objective-C: What is the output of this code?

Mobile developer
objective-c
autorelease pool
Smart&Softat Nov 2, 2021
Medium
0 vote32 runs0 comment

What is the syntax to create a section in an Objective-C header file?

Mobile developer
preprocessor
directives
Smart&Softat Nov 2, 2021
Medium
0 vote30 runs0 comment

How to get the image from the UIImagePickerController in Objective-C

Mobile developer
objective-c
uiimagepickercontroller
Smart&Softat Nov 3, 2021
Medium
0 vote30 runs0 comment

How to import XCTest framework in Objective-C

Mobile developer
unit testing
XCTest
Smart&Softat Nov 2, 2021
Hard
0 vote29 runs0 comment

How to make a method thread safe in Objective-C

Mobile developer
objective-c
synchronization
Smart&Softat Nov 2, 2021
Medium
0 vote29 runs0 comment

What is the difference between frame and bounds in Objective-C?

Mobile developer
frame
bounds
Smart&Softat Nov 2, 2021
Expert
0 vote29 runs0 comment

What is the default type of a variable in Objective-C?

Mobile developer
objective-c
auto
Smart&Softat Nov 2, 2021
Easy
0 vote28 runs0 comment

What is the type of the variable "dict" in this code?

Mobile developer
dictionary
objective-c
Smart&Softat Feb 27, 2023
Expert
0 vote28 runs0 comment

What is a non-concurrent operation in Objective-C?

Mobile developer
objective-c
concurrent
Smart&Softat Nov 3, 2021
Medium
0 vote28 runs0 comment

What is the name of the class that implements the synchronized keyword in Objective-C?

Mobile developer
mutex
objective-c
Smart&Softat Nov 3, 2021
Medium
0 vote27 runs0 comment

What is the type of the result of the following expression: [NSNumber numberWithInt:10] + [NSNumber numberWithInt:20]

Mobile developer
block
objective-c
Smart&Softat Nov 3, 2021
Easy
0 vote27 runs0 comment

How to create a UIPickerView in Objective-C

Mobile developer
uipickerview
Smart&Softat Nov 2, 2021
Medium
0 vote27 runs0 comment

What does the following Objective-C code do?

Mobile developer
objective-c
notification
Smart&Softat Nov 2, 2021
Hard
0 vote27 runs0 comment

What is the type of the property 'atomic' in Objective-C?

Mobile developer
atomic
Smart&Softat Nov 2, 2021
Expert
0 vote27 runs0 comment

What is the default value of an uninitialized Objective-C variable?

Mobile developer
primitives
types
Smart&Softat Nov 2, 2021
Medium
0 vote26 runs0 comment

What is the type of the result of the following expression? '2023-03-08 12:00:00 +0000'.dateWithFormat('yyyy-MM-dd HH:mm:ss Z')

Mobile developer
date
objective-c
Smart&Softat Nov 12, 2021
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