We can iterate through a dictionary using various methods in swift. You can iterate a dictionary for keys and values also. We will use the different approaches to iterate a dictionary like below − Using a for-in loop Iterating all the keys in a dictionary Iterating all the values in a dictionary Iterating all the elements using the enumerated() method Using a for-in loop Most of the time we use the for-in loop to iterate through a dictionary. Using a for-in loop, you can iterate all the elements of a dictionary like the below − Syntax for (key, ... Read More

Swift provides a protocol to achieve the localized description. You can use the LocalizedError protocol to provide a localized description of an error type. This protocol can be conformed by structure, enum, or class. After adopting this protocol, you have to implement the errorDescription property to provide the localized description. Here is an example of a custom error enum that conforms to the LocalizedError protocol − Create a custom error and conform to the Error type In this example, we will create an enum called CustomError to conform to the LocalizedError protocol. In the enum, we will add cases ... Read More

In Swift, you can use the .allCases property to enumerate all cases of an enum that have CaseIterable protocol conformance. You will see an example of using the CaseIterable protocol that can help you to iterate all cases of an enum. Using different ways like a for-in loop, reduce, filter, and map functions you can iterate an enum. What is the CaseIterable Protocol? The CaseIterable is a protocol that is used to iterate the enum cases. It synthesized all cases automatically for an enum. Remember that, this protocol can not be applied in the case of associated values. This protocol ... Read More

In this article, you will see how you can check the OS version to build the functionalities in the Swift language. We will use the following methods to check the OS version in Swift − Using the ProcessInfo class Using the #available attribute Using the UIDevice class Using the @available attribute Using the ProcessInfo class The ProcessInfo class can be used to fetch the versions (Major, minor, and patch) in the Swift language. Below is an example to fetch the iOS version and print it to the console.Example  import Foundation let osVersion = ProcessInfo.processInfo.operatingSystemVersion print("OS version major: \(osVersion.majorVersion)") ... Read More

Swift has various methods to append elements to a dictionary. We will use the below methods to append elements in a dictionary in the Swift language − Append elements using the updateValue() method Append elements using the subscript syntax. Append elements using the merging() methods. Using the updateValue() method The updateValue( :forKey:) method in swift is used for updating the value for an existing key or adding a new key-value combination to an existing dictionary. The method will return nil instead of the key's prior value if the key wasn't previously present in the dictionary, Here is an ... Read More

You can specify the range operator using two syntaxes (..< or ...). These two syntaxes are used for different purposes. As part of the first syntax, the starting and ending values of the range are included. In contrast, the second syntax includes a starting value as well as an optional ending value. For example, you want to specify a range from the number 1 to 4. You can define it like this 1..

You can use the Timer class in Swift to create a timer that can execute a method repeatedly at a specified time interval. You can implement the timer to solve different problems. You can schedule repeatable and non-repeatable timers in Swift. Timers in Swift can be used to perform a variety of tasks, such as − The process of carrying out a specific action or chunk of code at specified intervals of time, such as updating a display or changing a label's content, or performing any other UI action. Sending a reminder or establishing a background activity that will ... Read More

In Swift, you can make a weak protocol reference by using the weak keyword when declaring the variable or property that holds the reference to the protocol. The weak reference helps you to avoid the retain cycle creation. What is a weak protocol reference? A weak protocol reference in Swift is a technique for defining a protocol that a class can use without starting a strong reference cycle. When two objects maintain strong references to one another, preventing either object from being deallocated, this is known as a strong reference cycle. One of the objects is able to deallocate the ... Read More

In Swift, you can define a base class using the class keyword. The base class can be used to implement common properties using a single class. You can define the properties and methods in a class like the one below − class MyBaseClass { // properties and methods go here } A subclass is also defined by the class keyword. In a similar way, you can define the properties and methods in the class. To make it a subclass, you have to mention the parent class followed by the parent class name after the colon like ... Read More

In this article, you will learn various ways to generate random alphanumeric strings in the Swift language. Here we are going to use the following 3 methods to generate a random alphanumeric string in swift − Using the RandomNumberGenerator protocol Using the Random() function Using higher-order functions Using the RandomNumberGenerator protocol Swift 5 comes with a random() function that is added to the Foundation framework. We will use the RandomNumberGenerator protocol as the random() function is a part of this protocol.Example The following example demonstrates on how to use the random() function to generate a random alphanumeric ... Read More