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Articles by Nitin Aggarwal
132 articles
How to iterate a loop with index and element in Swift?
In this article, you will learn how to iterate a collection using a loop with an index and element in the Swift language. In this article, you will learn how to use the enumerated() method. In Swift, you can use the enumerated() method to iterate over the elements of a collection and access both the index and the element in each iteration of the loop. enumerated() enumerated() is a method in Swift that allows you to iterate over the elements of a collection, such as an array or a dictionary. It returns a series of tuple elements, each of which ...
Read MoreHow to check if an element is in an array?
This article will explain how you can check if an element exists in an array or not in the Swift language. There are several ways to check if an element is in an array in Swift − Using the contains method The contains(_:) method returns true if an array contains the target element. This method can only be used with arrays whose elements conform to the Equatable protocol. Here is an example where we use contains with an array of strings. String conforms to the Equatable protocol, so we can use the contains method here. Algorithm Step 1 - ...
Read MoreHow do I make an attributed string using Swift?
This article will explain how you can make an attributed string in the Swift language. What are the steps to apply different attributes to a string in Swift? In Swift, we use the NSAttributedString class to make an attributed string. In Swift, NSAttributedString is a class used to create and manage attributed strings. An attributed string is a string that has additional attributes, such as text color, font, and style, applied to parts of the string. This article will show different use cases for an attributed string. Basic Setup import UIKit class TestController: UIViewController { private ...
Read MoreHow do I change the font size of a UILabel in Swift?
You can change the font size of a UILabel in Swift by setting the font property of the UILabel to a UIFont object with the desired point size. Here is the code for the basic setup import UIKit class TestController: UIViewController { private let messageLabel = UILabel() override func viewDidLoad() { super.viewDidLoad() initialSetup() } ...
Read MoreHow do I add 1 day to an NSDate?
In this article, you will learn how to add the number of days to a date in the Swift language. Many times, you might need to modify the date by changing some number of days, weeks, months, etc. Swift provides an in-built concept for adding a component to date. Let's see some examples. Let's take a brief look at a few of the common concepts that will be used in these examples. Calendar Class The Calendar class in Swift is a class that represents a calendar, which is a system for organizing dates. It is used to perform calendar-related calculations, ...
Read MoreGetting a \"This application is modifying the autolayout engine from a background thread\" error?
In iOS development, this error frequently occurs while working on user interfaces. Also, you can reduce the chances of coming across this error if you write code carefully. Let's understand what this error is all about. It will help you to understand the reason behind this error if you read the error statement. The error "This application is modifying the autolayout engine from a background thread" is caused when an application attempts to make changes to the user interface from a background thread, which is not allowed in iOS development. Autolayout is a system for defining the layout of user ...
Read MoreGet the class name of an object as a string in Swift
This article will explain to you how to get the name of the class of an object in the Swift language. Swift provides us with a function called type(of:) to get the type of a value or the class name of an object. You can use the type(of:) function to find the dynamic type of a value, particularly when the dynamic type is different from the static type. The static type of a value is the known, compile-time type of the value. The dynamic type of a value is the value’s actual type at run-time, which can be a subtype ...
Read MoreGenerate a UUID on iOS from Swift
This article will explain to you what is the UUID in iOS and how to generate it in the Swift language. You will see some practical situations in which UUID is useful in the iOS application. What is UUID? A universally unique identifier (UUID) is a string of characters that is guaranteed to be unique across all devices and at all times. UUIDs are often used to uniquely identify resources, such as database records or files. In iOS, UUIDs can be used for a variety of purposes. Some common use cases for UUIDs in iOS include − Identifying app-specific ...
Read MoreViewDidAppear is not called when opening the app from the background
In Swift, the viewDidAppear method does not call when an application is opened from the background. In that case, you have to use the applicationWillEnterForeground method in the AppDelegate. In this article, you will see an example of how to perform an action when opening an app from the background. Approach If you open an app from the background, it should call the applicationWillEnterForeground method of the app delegate before presenting the view. However, it's possible that the viewDidAppear method of the view controller is not called if the view controller's view is already on the screen or if the ...
Read MoreSwift integer conversion to Hours/Minutes/Seconds
In Swift, there are many approaches to converting an integer to time components like hours, minutes, and seconds. Every approach depends on the requirement. For example, you can use arithmetic operators to convert. Another approach is using DateComponentsFormatter class to convert an integer into time components easily. In this article, you will see many examples of converting an integer to time components. Example 1 To convert an integer representing a duration in seconds to hours, minutes, and seconds, you can use the following code in Swift − import Foundation let durationInSeconds = 3661 let hours = durationInSeconds / 3600 let ...
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