Procentris IOS Developer Interview Questions and Answers

Q1. GCD, Operation queue, struct vs class, some small logical coding ,
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Q1. GCD, operation queue, URL Session tasks, ref type , value tyep,
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Q1. Basic and discussion about Job offer
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Q1. Based on the position
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Q1. About previous experience
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Q1. Difference betweenClass And Struct
Ans. 
Classes are reference types, while structs are value types in Swift.
• Classes are reference types, meaning they point to the same memory location when assigned to a new variable.

• Structs are value types, meaning they create a new copy when assigned to a new variable.

• Classes support inheritance, while structs do not.

• Classes can have deinitializers, while structs cannot.

• Classes can be typecasted, while structs cannot.
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Q2. Static Key work
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Find the index of the first occurrence in string

Q1. Salary Expectation
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Q2. Any leave plans in next six months
Ans. 
Yes, I have planned a vacation in the next six months.
• I have scheduled a week-long trip to Europe in September.

• I also plan to take a few days off around Christmas to visit family.

• I have informed my team in advance and ensured that my work will not be affected.
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Q1. Lifecycle method, polyfills, performance, optimisation
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Q2. New architecture, design patterns
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Q1. What is MVVM and how to bind data using MVVM
Ans. 
MVVM is a design pattern that separates the UI from the business logic by introducing a middle layer called ViewModel.
• Model-View-ViewModel design pattern

• ViewModel acts as a link between the Model and View

• Data binding is used to connect the ViewModel to the View

• Updates in the ViewModel automatically reflect in the View
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Q2. What is SSL pinning
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SSL pinning is a security measure used to prevent man-in-the-middle attacks by associating a specific SSL certificate with a particular app.
• SSL pinning involves hardcoding the expected SSL certificate or public key within the mobile app.

• This helps verify the server's identity and prevent attackers from intercepting and decrypting communication.

• SSL pinning can be implemented using libraries like TrustKit or manually by ...read more
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Q1. Basic android questions
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Q2. Services mvvm roomdb and all basic android things
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Q1. Android basics, fragments, activities, their life cycle
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Q2. Java basics, wrapper, kotlin, mvvm, api calls
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Q3. Dsa question- move all the zeroes to left and 1s to the right
Ans. 
Move all zeroes to left and ones to right in an array
• Iterate through the array from both ends

• Swap the elements if left is 1 and right is 0

• Stop when left and right pointers meet
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Q1. Service, background foreground service
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Q2. Mvvm, how does it work, viewmodel internal
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Q3. Memory leakage, how to avoid and identify
Ans. 
Memory leakage can cause app crashes and slow performance. It can be avoided by proper memory management and identifying the root cause.
• Avoid creating unnecessary objects

• Release unused resources

• Use memory profiling tools like Android Profiler

• Avoid static references to objects

• Use weak references when necessary
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Q4. Perquisite to release app on play store
Ans. 
Perquisites for releasing an app on Play Store
• Creating a developer account on Google Play Console

• Complying with Google Play policies and guidelines

• Providing accurate app information and metadata

• Ensuring app compatibility with target devices

• Testing app thoroughly for bugs and crashes

• Publishing app with appropriate content rating

• Setting up monetization options and pricing

• Providing customer support and responding to user
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