Top 20 iOS Interview Questions and Answers

The operating system in Apple phones is iOS.

• iOS is a mobile operating system developed by Apple Inc.

• It is the second most popular mobile operating system in the world.

• iOS is known for its user-friendly interface and security features.

• Examples of Apple phones that run on iOS are iPhone 12, iPhone 11, and iPhone SE.

To create and upload a release application on Android and/or iOS, you need to follow specific steps for each platform.

• For Android, you need to generate a signed APK using Android Studio and then upload it to the Google Play Store.

• For iOS, you need to create an archive in Xcode, validate it, and then distribute it through the App Store Connect.

• Make sure to follow the guidelines and requirements set by Google and Apple for releasing applications on their platforms.

MVVM is a design pattern that separates UI code from business logic and data models.

• MVVM stands for Model-View-ViewModel

• Model represents the data and business logic

• View displays the UI and user interactions

• ViewModel acts as a mediator between Model and View

• ViewModel exposes data and commands to View

• MVVM helps in testability, maintainability and scalability of code

Yes, it is possible to block screen capture feature on an iOS device even if it is not enrolled through DEP.

• You can use a mobile device management (MDM) solution to block screen capture feature on iOS devices.

• MDM solutions like Jamf, Microsoft Intune, and VMware Workspace ONE can help you enforce policies on iOS devices.

• You can create a policy in your MDM solution to disable the screen capture feature on iOS devices.

• This policy will apply to all iOS devices that are enrolled ...read more

To integrate Push Notification in iOS, you need to register for remote notifications, handle the registration token, and implement the necessary delegate methods.

• Register for remote notifications using the UIApplication.shared.registerForRemoteNotifications() method.

• Implement the AppDelegate's didRegisterForRemoteNotificationsWithDeviceToken method to handle the registration token.

• Implement the AppDelegate's didReceiveRemoteNotification method to handle incoming notifications...read more

Mac OS is a desktop operating system for Mac computers, while iOS is a mobile operating system for iPhones and iPads.

• Mac OS is designed for desktop and laptop computers, while iOS is designed for mobile devices like iPhones and iPads.

• Mac OS has a traditional desktop interface with windows and files, while iOS has a touch-based interface with apps and gestures.

• Mac OS supports a wider range of software and peripherals compared to iOS.

• Mac OS allows for more customization and fle...read more

I would plan an app development in iOS by first defining the project scope, creating wireframes, designing the user interface, developing the app, testing it thoroughly, and finally launching it on the App Store.

• Define project scope and requirements

• Create wireframes and mockups

• Design user interface following Apple's Human Interface Guidelines

• Develop the app using Swift programming language and Xcode IDE

• Test the app on various devices and iOS versions

• Submit the app to the App ...read more

The app life cycle in iOS refers to the sequence of events that occur from the time an app is launched to when it is terminated.

• The app is launched by the user or system.

• The app enters the foreground and becomes active.

• The app can enter the background when the user switches to another app or the device locks.

• The app can be terminated by the user or system.

• The app can also be suspended, where it remains in memory but does not execute code.

• Examples: launching an app, switching ...read more

Adopting new iOS versions involves staying updated, testing compatibility, updating codebase, and utilizing new features.

• Stay updated on new iOS versions and features released by Apple.

• Test compatibility of existing apps with the new iOS version.

• Update the codebase to ensure compatibility and take advantage of new features.

• Utilize new features introduced in the latest iOS version to enhance app functionality.

• Consider redesigning UI/UX to align with the latest iOS design guide...read more

Design patterns are important in Android and iOS app development for efficient and scalable code.

• MVC (Model-View-Controller) pattern is commonly used in both Android and iOS development.

• Android also uses MVP (Model-View-Presenter) and MVVM (Model-View-ViewModel) patterns.

• iOS uses the Delegate pattern for communication between objects and the Singleton pattern for creating a single instance of an object.

• Other patterns used in Android and iOS development include Factory, Observ...read more

The latest macOS version is macOS Big Sur and the latest iOS version is iOS 14.

• macOS Big Sur is version 11.0

• iOS 14 was released on September 16, 2020

Automation concepts for iOS involve using tools like Appium, XCUITest, and XCTest to automate testing of iOS applications.

• Use Appium for cross-platform testing of iOS apps

• XCUITest is Apple's native UI testing framework for iOS apps

• XCTest is Apple's unit testing framework for iOS apps

ViewController life cycle refers to the sequence of events that occur during the creation, loading, and unloading of a view controller.

• viewDidLoad() is called when the view controller's content view is created and loaded into memory.

• viewWillAppear(_:) is called just before the view controller's content view is added to the app's view hierarchy.

• viewDidAppear(_:) is called after the view controller's content view has been added to the app's view hierarchy.

• viewWillDisappear(_:) ...read more

The latest version of IOS is IOS 15.

• IOS 15 was released on September 20, 2021.

• It includes new features such as FaceTime enhancements and redesigned notifications.

• It is compatible with iPhone 6s and later models.

• It also includes security updates and bug fixes.

iOS is the operating system used by Apple devices, while Android is used by a variety of manufacturers.

• iOS is exclusive to Apple devices, while Android is used by various manufacturers like Samsung, Google, and Huawei.

• iOS has a more closed ecosystem with limited customization options, while Android is more open and customizable.

• iOS tends to have faster updates and better app quality control compared to Android.

• iOS devices are generally more expensive than Android devices.

• iOS ...read more

iOS architecture refers to the overall structure and design of an iOS application, including how components interact and communicate with each other.

• iOS architecture typically includes components such as Model-View-Controller (MVC), Model-View-ViewModel (MVVM), and Model-View-Presenter (MVP).

• Architectural patterns help in organizing code, improving scalability, and enhancing maintainability of iOS applications.

• Examples of iOS architectural patterns include VIPER (View, Intera...read more

The latest OS on iPhones and iPads is iOS 14.

• iOS 14 was released on September 16, 2020.

• It introduced new features like App Library, Widgets, and Picture-in-Picture.

• iOS 14.5, a major update, added support for Face ID with masks and App Tracking Transparency.

• iOS 14.6 and iOS 14.7 brought bug fixes and performance improvements.

• iOS 15 is the upcoming OS version for iPhones and iPads.

Use platform-specific locators or conditional statements to handle different element xpaths in iOS and Android apps.

• Use platform-specific locators like accessibility id for iOS and resource id for Android

• Implement conditional statements to switch between different xpaths based on the platform

• Utilize Appium's platformName capability to identify the platform and adjust the element xpath accordingly

I have 5 years of experience developing iOS applications using Swift and Objective-C.

• Developed multiple iOS applications from scratch using Swift and Objective-C

• Experience with UIKit, Core Data, Core Animation, and other iOS frameworks

• Worked on integrating third-party libraries and APIs like Firebase and Alamofire

• Optimized app performance and memory management for better user experience

• Familiar with Apple's Human Interface Guidelines and best practices for iOS development

Android and iOS are two major mobile operating systems used worldwide.

• Android is developed by Google and is open source.

• iOS is developed by Apple and is proprietary.

• Android has a larger market share globally, while iOS users tend to spend more on apps.

• Developing apps for both platforms may require different skill sets and tools.

The different steps in ios development include design, development, testing, deployment, and maintenance.

• Design: Planning the app's user interface and features.

• Development: Writing code to implement the design.

• Testing: Checking for bugs and ensuring functionality.

• Deployment: Releasing the app to the App Store.

• Maintenance: Updating the app and fixing issues post-launch.

Types of access controls in iOS include public, internal, private, and fileprivate.

• Public: Accessible from anywhere, both within the module and outside.

• Internal: Accessible from anywhere within the module.

• Private: Accessible only within the defining type.

• Fileprivate: Accessible only within the same file.

Steps for IOS upgrade include backing up current configuration, downloading new IOS image, verifying compatibility, installing new image, and testing functionality.

• Backup current configuration using 'copy running-config tftp' command

• Download new IOS image from Cisco's website or TFTP server

• Verify compatibility of new IOS image with hardware and existing configuration

• Install new IOS image using 'copy tftp flash' command

• Test functionality of the new IOS image to ensure proper o...read more