Major Interview Questions/Answers When Hiring iOS Developers?
What are protocols of iOS development?
Protocols are a set of methods or properties adaptable by the class establishing a blueprint for communication by defining a common interface between them. The class allows implementation of required methods and properties defined within those protocols.
What are the diverse ways of persisting data in iOS apps?
Data persisting in iOS can be done utilizing multiple methods like:
SQLite: An embedded database for storing structured data.
KeyChain: Leverages securely storing of the sensitive data inclusive of token and passwords.
Core Data: A framework and an object graph for maintaining complex data models.
User Defaults: Used to store manageable amounts of data such as preferences and settings.
What is the MVC pattern in iOS development?
MVC pattern standing for model-view-controller is a widely used architectural pattern within the ecosystem of iOS development. It leverages the separation of three components: Model,View, and controller.
Model: Representing the business logic of the deployed application
View: Displays the data to the user-facing side and presents the overall interface.
Controller: Bridges the gap between the model and view components facilitating enhanced communication.
Top Technical Skills To Look When Hiring An iOS Developer
When you hire iOS developers, they must be well-versed with programming languages such as Objective-C and Swift along with having the ability to write clean and maintainable code. Immense knowledge of the syntax features and corresponding best practices associated with each language is a major prerequisite for this. Code conventions and style guidelines must be followed, appropriate design patterns must be used, and language-specific features must be effectively utilized. iOS developers should understand Objective-C memory management concepts and how to handle memory efficiently especially in scenarios requiring manual memory management.
iOS Frameworks And APIs
The iOS developer for hire must hold experience working with frameworks such as Core Data, Core Animation and UI Kit Additionally. The developer should know API integration for features such as networking, push notifications, mapping and other major in-app functions.
Interface Designing And User Experience (UX)
The iPhone app developers for hire must hold enhanced familiarity with creating intuitive user interfaces that are responsive, visually appealing, functional, and user friendly. Additionally, they must be able to utilize tools such as audio layout, interface builder, and other tools to deploy an app with the right UI design.
When you hire iOS programmers, they should possess proficiency in version control systems like Git. This leverages the developers for efficient collaboration, code management, working easily with code repositories, branching, merging, or resolving conflicts within the development cycle.
Crucial Testing and Debugging Techniques When Building an iOS Application?
Developers utilize debugging tools such as break points, debugger, and console logs to assist and identify issues in real-time. This allows the run time errors, logic issues and unexpected app behavior upon execution to be resolved.
Unit testing is writing and executing tests that verifies the overall functionality of the individual components within the application. This allows the developers to easily identify and look into the issues within the early stage of development cycle.
Integration testing involves running tests on the interactions between diverse modules working together within the application. This includes API calls testing, third-party integration testing and database operations testing.
Importance of Core Data for Storage and Retrieval in iOS App Development
Core Data is a framework used within the iOS app development ecosystem leveraging developers with multiple benefits:
Object Graph Management
The object graph is the interconnected set of objects representing the data model. Core data allows simplification within the app’s code and the underlying database upon interaction making it easier to work with complex data structures.
Developers utilizing core data can persistently store and manage the app’s data on iOS devices supporting multiple stores such as SQLite, XML, and binary formats. The choice of store depends on the specific needs of the application, allowing ease in modeling data as objects and handling relationships within them.
Efficient Data Retrieval
The powerful querying mechanism of core data leverages developers to easily fetch data from the database in real-time manner. Additionally, it supports diverse types of queries such as fetching specific objects, filtering data based on conditions, sorting, and aggregating results.
How do you Localize your iOS Apps for Different Languages and Regions?
When you are localizing your iOS app for different languages and regions, following steps need to be followed:
This step involves utilizing NSLocalizedString API or Xcode's built-in tools for extracting and managing the localized strings. Internationalization allows your app to get its user interface separated from the code.
Preparing localization Of Files
Separate files of. strings are created for each in-app supported language. These files will store the translated versions of the text displayed on the user interface.
Translation Of The Strings
This step involves professional translators interpreting and translating the extracted strings to the target market. Each translation must be ensured to maintain the cultural appropriateness and reflect local conventions.
The localized files get added to your Xcode project linking it to the needed targets. Additionally, preferred language and regions need to be settled in the app’s setting.
Testing And Verification
The last step involves rigorously testing the localization for each version of the app against the language in region setting using either a simulator or physical device.
Which Code Versioning Tools Require Understanding when you Hire an iPhone Developer?
When you hire iOS app developers, knowledge on the following popular code versioning tools is required.
Git is a widely used version control system tool that tracks changes in the code, create branches for parallel development, merge code changes, while empowering effective collaboration. A strong command on this tool such as commit branching, merging and rebasing allows developers to empower an efficient iOS development cycle.
A web-based hosting service provider for Git repositories allowing developers to have a strong platform for collaboration, project management, and code review, The iOS app developers you hire must hold enhanced familiarity with GitHub workflows including pull requests, code reviews, and issues.
Bitbucket is a similar web-based hosting service provider for Git repositories offering features of version control and collaboration. The iOS developers for hire must have understanding on using BitBucket for valuable collaboration, issue tracking, branch management and code reviewing.