Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
Articles by Nitin Aggarwal
Page 11 of 14
How to use a Background Thread in Swift?
In this article, you will learn how you can perform a task in the background using a background thread in the Swift language. Swift provides us with several ways to perform background tasks. One popular option of theirs is GCD (generally called Grand Central Dispatch), which is a low-level API for managing concurrently in the Swift language. The GCD provides us with a global queue for creating background threads. You can invoke the DispatchQueue.global() method to get an instance of a global dispatch queue. Using the same instance, you can use the async() method to execute a block of code ...
Read MoreHow to define Optional Methods in the Swift Protocol?
This article will explain to you how to define optional methods in the protocol. Before diving into making optional methods in the protocol, you will first learn what a protocol is and how to declare one in Swift. What is The Protocol? A protocol is a type that defines a group of methods or properties. Basically, you can define a blueprint of methods to specify behavior. A protocol is similar to interfaces in other programming languages. Syntax Here is the syntax of a simple protocol in Swift − protocol { // Properties // ...
Read MoreHow do I get the version and build number of an application using Swift?
You often need to deal with the version and build number of the iOS application. It helps you to perform debugging operations on the server side. You can check which version or build the client (IOS app user) has. Based on that, you can debug the issues coming from the client side. Version and build numbers might be needed to display to the user to verify what version and build are currently running by the end user. To get the app version and build number in Swift, you can use the Bundle class, which provides access to the app's bundle ...
Read MoreHow do I convert a Swift array to a string?
Let's look at some examples of how to convert an array to a string. Method 1:Using Joined(seperator:) Syntax Swift provides us with a method joined(separator:) of an array that can be used to convert a Swift array to a string. This method returns a new string by concatenating the elements of the array, separated by the provided separator string. let wordInString = words.joined(separator: ", ") In order to use the joined() method, call it by array along with passing the separator whatever you want. Algorithm Step 1 − Initialize your array Step 2 − Call joined() method with ...
Read MoreHow do I concatenate or Merge Arrays in Swift?
Swift provides us with two different ways to concatenate or merge arrays in the Swift language. You can use the + (plus) operator or the append() method. You will see other methods also of how you can merge multiple arrays in Swift. These methods are − Using plus (+) operator Using append(contentOf:) method Using flatMap() high-order function Using joined() method Using reduce() high-order function Method 1: Merge Arrays Using The + Operator Syntax let outputArray = firstArray + secondArray In order to use + operator to merge the arrays, simply it works as a binary operator that ...
Read MoreDoes Swift have a Trim Method for Strings?
In Swift, you can use the trimmingCharacters(in:) method of the String type to trim parts of a string. It is an instance method that returns a newly created string made by removing the applied character set. This method accepts a parameter of type CharacterSet to perform leading and trailing characters. You can apply different types of CharacterSet to trim a string. There are some of the most commonly used CharacterSets, like − whitespaces whitespacesAndNewlines decimalDigits letters lowercaseLetters uppercaseLetters punctuationCharacters capitalizedLetters newlines You will learn some of them about how to perform different types of trimming of a string. ...
Read MoreWhat is the difference between Static func and Class func in Swift?
You will learn about the differences between static and class functions in this article. Many times, you might think they are the same thing, but that's not the case. Let's understand the difference between them. What are Static Functions? In Swift, a static function is a type of function that is associated with a type and not with an instance. This means that an instance is not required to call a static function as it can be called from the type itself. Example Here's an example of how you might define a static function in Swift − struct ViewPoint { ...
Read MoreNSNotificationCenter addObserver in Swift
The purpose of this article is to explain how an iOS application can send and receive change events using NSNotificationCenter. In an iOS application, you might need to send and receive events anywhere in the app. It may be useful to use the NSNotificationCenter class when you need to receive events anywhere in the app. In this case, you can listen to events and react accordingly. NSNotificationCenter class in the Foundation framework that provides a mechanism for broadcasting notifications to registered observers. It allows objects to communicate with each other and respond to events that occur within a program. How ...
Read MoreWhat does "Fatal error: Unexpectedly found nil while unwrapping an Optional value" mean?
This error is very frequent as you can see many times while writing code. Don't worry, you will understand this error in detail in this article. Before jumping to the cause of this error, let's understand what is optional in Swift. Optional Initially, when we receive a value from another source, such as the backend server, it might contain a valid value or nothing at all. In that case, you use optionals that represent a variable with two possible situations: either a value or no value at all. var possibleNumber = "450" var convertedNumber = Int(possibleNumber) In the above ...
Read MoreLoading/Downloading an image from a URL in Swift
In this article, you will learn how you can download an image from a URL in the Swift language. In the iOS application, image downloading from the image URL is the most common task. Apple provides us with a native library to download any data from any URL. There are many third-party libraries available on GitHub to download the images. But in this tutorial, we are not going to use any third-party library. We will use the URLSession class provided by Apple itself. What is the URLSession Class? URLSession is a class in the Foundation framework that provides an API ...
Read More