Are you ready to learn one of the exciting technologies of our generation? Then here you go. Do you know that IOS operating system is used to run all the Apple application devices? It may be anything like the iPhone, IPad, Mac notebooks, and laptops. Apple is one of the biggest software giants, this has a huge customer base. Becoming an IOS developer is nothing greater than learning any other technologies. If you are looking for the top IOS development interview questions and answers, we have come up with a frequently designed IOS development interview questions and answers article. This article will help you to crack any complex interview questions and get into top companies. Let’s start to begin learning.
Ans: Below are a few important characteristics of IOS:
Ans: The below table will explain the major differences between IOS and Windows
UIkit framework: this type of framework is mainly used to develop user interfaces. The following are the few features of using the UIKIT framework;
UIkit. The framework offers the complex infrastructures required to construct and manage IOS application devices.
Ans: There are 4 methods used to respond to state transitions such as;
Ans: You can see the following features added in IOS 9:
Ans: ASSIGN is used to create references from one object to another, the below program will explain this;
If (_variable ! = object)
_variable = nil;
_variable = object;
RETAIN used to create the differences between one object and another;
If (_variable! = object)
Variable = nil;
_variable = [object retain];
Ans: Below are the three ways to achieve concurrency;
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Ans: The different application states of IOS included are;
Not running state: this state is used when the app has not been launched yet, or that was terminated by the system.
Inactive: this state is used when the application is running in the foreground and not receiving any events.
Active state: when applications are running in the foreground and receiving events by that time this state is used.
Background state: this state is used to run the application in the background and execute the codes.
Suspended state: this state is used to terminate the program.
Ans: A UIKIT class uses the application thread from the application’s main thread.
Ans: Below are the two ways which explain this;
Ans: The layer objects are nothing but data objects which represent the visual features, views and render the contents. These layers are custom layers that are added to the interfaces to execute any complex animations.
Ans: A SWIFT is one of the programming languages used in the development of IOS applications. SWIFT language adopts safe programming patterns and offers many modern features to make programming easier to implement, flexible, and more fun to write.
Ans. ARC, or Automatic Reference Counting, is a compiler-level feature used by Swift to track and manage an application's memory usage. It helps release the memory of class instances when there is no need for memory reserved. It does so by initializing and deinitializing system resources. In iOS development, the role of ARC concepts is highly crucial.
Ans. iBeacons is newly introduced by Apple, a Bluetooth wireless technology. It's a new technology useful for iPhone and iOS users to get location-based information and services. These small-scale wireless transmitters use Bluetooth low-energy technology to transmit data or signals to nearby smart devices.
Ans. In iOS, GCD refers to Grand Central Dispatch, a low-level API that helps you manage different concurrent operations. It can also help you enhance your app's responsiveness by delaying computationally rigorous tasks to the context.
Ans. In iOS, operator overloading refers to adding new operators by altering existing operators to perform different activities. It allows us to alter the way of working of existing operators using some specific structures. The various operators includes +, *, /, etc. symbols.
Ans. KVO stands for Key-Value Observing, a technique for observing changes to the property value. If we have an object including some cited variables, then KVO enables other objects to monitor the modifications to any of these variables.
Ans. In iOS, the term Dynamic Dispatch means that a program decides at run time which implementation of a specific function it needs to invoke. It is useful when we need to call on our methods similar to the object method.
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Ans. Cocoa is an app development environment useful for OS X and iOS. Also, it helps in creating software codes to run on iOS and includes the Foundation and Appkit frameworks. Further, we can use it for referring to any class or object based on the Objective-C runtime.
Cocoa Touch is an app development environment for iOS written in Objective-C language. It also consists of Foundation and UIKit frameworks. Cocoa Touch is useful in developing software apps for the products like iPhones, iPad, etc.
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Ans. The bundle ID is defined in each app which is useful for both OS X and iOS. A bundle identifier can easily identify your apps' updates. Moreover, Bundle ID is mentioned in XCode. A single XCode project can include many targets and output different apps.
Ans. The following are the most important data types found in Objective-C.
Ans. The following coding languages are used in iOS development.
Ans. Synchronous refers to the tasks that will execute in order. In this type of operation, the thread must wait for the completion of the activity before proceeding further.
Asynchronous is the opposite of synchronous or "out of order ."In this call, the tasks may or may not be executed in order. These tasks allow a user to process different requests at the same time. It helps to complete more tasks within a short time.
Ans. In Swift, the NSError class is a Cocoa class. The NSError object holds the information about an error condition in an extendable and object-oriented way. Moreover, it consists of attributes like a predefined error domain, a domain-specific error code, and a user details dictionary that includes app-specific information.
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Ans. It is a user-defined data type or a class type defined by the keyword "Enum ."Further, it includes a certain set of values that allows a user to work with those values in a type-safe or intact way within the code.
Ans. A guard statement is used when one or more requirements are not met. Further, passing a program control out of a domain or realm is useful.
The following are the various benefits of a Guard Statement
Ans. Atomic properties have default behavior and are not much faster, and they guarantee always to return a completely initialized object. Also, the Atomic properties come at the expense of performance.
On the other hand, nonatomic properties don't have default behavior and are much faster. But they cannot deal with many incoming requests at the same time.
Ans. The following are the important benefits of Swift language.
Ans. It's a temporary container for various values which holds a list of comma-separated types, and the same is bounded in parentheses. You can use it as a function's return type to allow the function to return a single tuple that holds different values.
Ans. KVC or Key-Value Coding is useful for accessing a value using a string. In other words, it means indirectly accessing an object's properties using strings to locate properties.
Ans. In iOS, the Responder chain is a hierarchy of objects that have the chance of responding to the events received. It is a series of events that occurs once the user interacts with the iPhone's application.
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