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Entrevistas simuladas LIVE de WithoutBook iOS Temas de entrevista relacionados: 5

Interview Questions and Answers

Conoce las principales preguntas y respuestas de entrevista de iOS para principiantes y candidatos con experiencia para prepararte para entrevistas laborales.

Total de preguntas: 52 Interview Questions and Answers

La mejor entrevista simulada en vivo que deberias ver antes de una entrevista

Conoce las principales preguntas y respuestas de entrevista de iOS para principiantes y candidatos con experiencia para prepararte para entrevistas laborales.

Interview Questions and Answers

Busca una pregunta para ver la respuesta.

Preguntas y respuestas para nivel intermedio / de 1 a 5 anos de experiencia

Pregunta 2

Define Cocoa/Cocoa touch.

It is used for building software codes to run on iOS for the iPad and iPhone. Cocoa Touch is written in the objective-C language and has a different set of graphical control elements to Cocoa.

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Pregunta 4

What is Method Swizzling?

The process of changing the implementation of an existing domain, Method Swizzling, enables you to write that code that can be executed before or after the original method.

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Pregunta 5

What is the difference between Viewdidload and Viewdidappear?

Viewdidload:

  • It is called when it is loaded into memory.
  • Data can be loaded in Viewdidload if it is fairly static and likely to change.

Viewdidappear:

  • It is called when the view is visible and presented on the device.
  • You can perform any layout functions or draw in the UI.
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Pregunta 6

Which JSON framework is supported by iOS (iPhone OS)?

  • SBJson framework is supported by iOS. It is a JSON parser and generator for Objective-C (Objective-C is the primary programming language we use when writing software for OS X and iOS. It is a superset of the C programming language and provides object-oriented capabilities and a dynamic runtime).
  • SBJson provides flexible APIs and additional control that makes JSON handling easy.
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Pregunta 7

What is the difference between Synchronous & Asynchronous tasks?

  • Synchronous can also be defined as In order. When you perform the synchronous operation, all that follows must wait for the operation to complete before proceeding.
  • In contrast, “asynchronous” can also be defined as “out of order.” When you do something asynchronously, you can run the following code right away, and the asynchronous process will happen someday. It could be run on a separate thread from the rest of the code. It could easily be rescheduled on the same thread at a later date and you can notify you when it is done.
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Pregunta 8

What are the different ways to specify the layout of elements in UIView?

Here are a few common ways to specify the layout of elements in UIView:

  • Using InterfaceBuilder, we can add a XIB file to our project, layout elements within it, and then load XIB in our application code (either automatically, based on naming conventions, or manually). Also, using InterfaceBuilder, we can create a storyboard for our application.
  • We can write our own code to use NSLayoutConstraints and have elements in a view arranged by Auto Layout.
  • We can create CGRects describing the exact coordinates for each element and pass them to UIView’s (id)initWithFrame:(CGRect)frame method.
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Pregunta 10

Differentiate between a frame and a bound.

A UIView’s bounds are a rectangle with a size (width, height) and position (x,y) relative to its own coordinate system (0,0).

A UIView’s frame is a rectangle with a scale (width, height) and position (x,y) relative to the superview it is located within.

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Pregunta 11

How to Prioritize Usability in Design?

To prioritize usability, the design process has broken down into 4 steps:

  • Consider the user’s perspective when designing the user experience.
  • Users, not demographics, are what you should focus on.
  • Consider all of the scenarios in which an app might be useful when promoting it.
  • Even after the app has been released, continue to improve its functionality.
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Pregunta 13

What is the lazy property in swift?

When the property is called for the first time, an initial value of the lazy stored properties is calculated. In many situations, lazy properties come handy to developers. 

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Pregunta 14

What is the difference between 'bundle ID' and 'app ID'?

The bundle ID is specified in Xcode, and it defines each App. A single project can have multiple targets and can output multiple apps. Use: it is branded multiple ways and has both free/lite and full/pro versions.

App ID is used to identify one or more apps from a single development team. It is a two-part string with a period(.) separating Team ID and bundle IF search string. The bundle ID search string is supplied by the developer, while Apple supplies the Team ID.  

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Pregunta 15

When an app is launched, what are its state transitions like?

Before launch, an app is not said to be running. After a brief transition through the inactive state, it moves to the background or the active state when it is launched. 

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Pregunta 16

What are the essential certificates for issuing and developing apps, either Android or iOS?

The certificate types are:

  1. Development Certificate
  2. Distribution Certificate 
  3. Development and Distributing Certificates 
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