Q. Explain the iOS app life cycle and 3 delegate methods of the AppDelegate. iOS App life Cycle: The iOS app life cycle refers to the sequence of states that an app goes through from its launch to its termination. Understanding the life cycle is crucial for managing resources, saving state, and responding appropriately to…
Q. Explain the difference between property wrappers and property observers in Swift. Property Wrappers and Property Observers: Property wrappers and property observers are both features in Swift that relate to properties, but they serve different purposes and operate at different levels of abstraction. Property Observers: Purpose: Property observers are used to observe and respond to…
URLSession in Swift: URLSession is a class in Swift that provides an API for making network requests. It is part of the Foundation framework and is commonly used to perform tasks such as fetching data from a web service, downloading files, or uploading data to a server. Here are some key aspects of the URLSession…
Model View Controller in Swift: MVC, which stands for Model View Controller in Swift, is a design pattern used in software development. It helps to organize code in a way that separates the concerns of data management, user interface, and control flow. MVC divides an application into three interconnected components or layers, each with distinct…
Memory Management (ARC) in Swift: In Swift, Automatic Reference Counting (ARC) is a memory management mechanism used to automatically track and manage the allocation and deallocation of memory for your objects. The goal of ARC is to help manage the lifetime of objects and prevent memory leaks by keeping track of how many references there…
strong and weak keywords in Swift: In Swift, Strong and weak are keywords used when dealing with reference types (usually classes) to manage memory and prevent strong reference cycles (retain cycles). Strong Reference (strong): By default, all references in Swift are strong. A strong reference increases the reference count of the object it points to,…
Closures in Swift: A closure is a block of code that can be executed later. Closures in Swift can capture and store references to variables and constants from the context in which they are defined. This is known as closing over those variables. The closure can then refer to and modify the values of those…
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Convenience initializers in Swift: In Swift, a convenience initializer is a secondary initializer that provides an additional way to create an instance of a class or struct. Convenience initializers are defined using the convenience keyword. The primary initializer, often referred to as the “designated initializer,” is the main initializer that initializes all properties of a…
Failable initializers in Swift: Failable initializers in Swift is an initializer that can return nil to indicate that the initialization process has failed. Failable initializers are declared using the init? keyword. They are commonly used when the initialization of an object might not be successful due to certain conditions or invalid parameters. Here’s a simple…
Mutating keyword in Swift: The mutating keyword in Swift is used to indicate that a method or function can potentially modify the instance it is called on. This is particularly relevant for methods defined within value types, such as structs and enums. Value types have value semantics, which means that by default, methods cannot modify…
