Idealtech Consultancy Interview Questions and Answers

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.

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

Classes are reference types, while structs are value types in Swift.

• Classes are reference types, meaning they are passed by reference. Changes made to one instance will affect all references to that instance.

• Structs are value types, meaning they are passed by value. Each instance has its own copy, so changes made to one instance do not affect others.

• Classes support inheritance, while structs do not.

• Classes have deinitializers, while structs do not.

• Example: class Person { var ...read more

Protocol is a set of methods and properties that a class, struct, or enum can implement to define a particular functionality.

• Protocols define a blueprint of methods, properties, and other requirements that a class or struct must adhere to.

• They are similar to interfaces in other programming languages.

• Classes, structs, and enums can adopt protocols by conforming to them.

• Protocols allow for polymorphism and code reuse in Swift.

• Example: 'Equatable' protocol defines the '==' opera...read more

A closure is a self-contained block of code that can be passed around and used in your code.

• Closures capture and store references to any constants and variables from the context in which they are defined.

• Closures are similar to blocks in Objective-C and lambdas in other programming languages.

• Closures can be used to pass functions as arguments to other functions.

• Example: { (parameters) -> return type in code }

Generics allow you to write flexible, reusable functions and data types that can work with any type.

• Generics enable you to write functions and data types that can work with any type.

• They help in writing flexible and reusable code.

• Example: Array can hold elements of any type T.