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Swift Articles
Page 12 of 40
New Array from Index Range Swift
In Swift, you can create an array using the ArraySlice type. The following examples will show how to use the ArraySlice type. You can create an extension as well to define the subscript method. Example 1 In the following example, we create an array of numbers with values from 0 to 9 and then create a range of indices from startIndex to endIndex (exclusive). Using this range we can generate an ArraySlice of the original array. In the end, we will convert the ArraySlice to an array using the Array initializer and print the result. import Foundation let numbers = ...
Read MoreMultiple Type Constraints in Swift
In Swift, there are several ways to implement type constraints on types. We will use some common approaches like the where clause, protocol, etc. Generics provide lots of flexibility to write better and more secure code in Swift. We can apply generics to collections, custom types, etc. One of them is generic type constraints. Using type constraints, you can make your generic code behave that matches a certain set of constraints whatever you define. Swift provides multiple ways to specify type constraints on generic type parameters. Type constraints using the "where" clause The "where" clause in Swift is a highly ...
Read MoreHow to assign an action to the UIImageView object in Swift?
In the iOS applications, the UIImageView class does not provide in-build support to make it clickable like other components e.g. UIButton. In order to make UIImageView clickable, you can add a UITapGestureRecognizer to the image view. Remember that, by default, UIImageView does not take any interaction from the user. To make it interactable, set true to the isUserInteractionEnabled property. In this article, you will learn how you can add a tag gesture to the image view in Swift. To add a tap gesture, we will follow these steps − Step 1 - Create an Image View let profileImageView = ...
Read MoreHow to test the equality of Swift enums with associated values?
In Swift, you can use the Equatable protocol to compare enums with associated values. In this article, we will see how we can compare them using the Equatable protocol with an example. Enumeration with Associated Values In Swift, you can provide a value along with an enum case. This makes enumeration more powerful in Swift. A Swift feature called an enumeration with associated values enables you to design a type that can have a finite set of cases, each of which can have a unique set of associated values of any type. This enables you to link data to each ...
Read MoreSwift Program to Check if two sets are equal
Swift provide an equality operator(==) to check if the given two sets are equal or not. Here the equality of two the sets means that both the sets should be identical in terms of their size and elements. So if both the sets are identical or the same, then the equality operator returns true. Otherwise, the equality operator will return false. Syntax set1 == set2 Where set1 and set2 are two sets and using the == operator we check if they are equal or not. This operator will return true if both sets are equal. Else it will return ...
Read MoreSwift Program to Check if a Set is empty
In Swift, a set is used to create a collection of unique elements. In a set, the elements are not arranged in a particular order. Now to check if a set is empty or not Swift provide an inbuilt property named as isEmpty. This property will return true if the given set is empty. Otherwise it will return false. Syntax newSet.isEmpty Where newSet is the name of the set and we can access the isEmpty property using the dot operator. This property's return type is bool, meaning if it returns true, it means the set is empty. If it ...
Read MoreSwift Program to Convert an Set of String to Comma Separated String
Swift provide a inbuilt method named as joined() to convert a set of string to comma separated string. This function return the concatenated elements of the given sequence by inserting the given separator in between each element of the sequence. Syntax func joined(separator: sep) Where the separator parameter contains a string or sequence, which is further used to insert between each element of the given sequence. This function returns a concatenated or joined sequence of elements. Example In the following code, we will create and initialize a set of strings. Then we join the elements of the set ...
Read MoreSwift Program to Add Two Complex Numbers by Passing Class to a Function
In swift, a complex number is the combination of real and imaginary number. So we create a class to store the real and imaginary part of the complex number and then we pass this class in the function to find the sum of two complex numbers. Algorithm Step 1 − Create a class to store the real and imaginary part of the complex number. Step 2 − Create a function named as ‘add’ which takes two class objects as a parameters and return the sum of the two complex numbers by adding the real and imaginary part ...
Read MoreHow can I encode a string to Base64 in Swift?
In Swift, you can use the built-in Data type and its method base64EncodedString() to encode a string to Base64. In the iOS applications, you might need to encode a string to base64 mostly in networking requests and responses. Mostly, you will need to encode a string to base64 and vice versa. Let's learn how to encode a string to Base64 using Swift. Example In this example, we will use the following steps to encode a string to base64 − Step 1 − In this step, we will convert the string to a Data object using the data(using: .utf8) method. ...
Read MoreHow do I make an enum decodable in Swift?
In Swift, you can use the Codable protocol to make an enum decodable as well. In Swift, the Codable protocol is a very powerful concept to provide flexibility to decode and encode any type of value. Also, you can make an enum decodable as well. You have to just define an enum in your custom type. In order to make an enum decodable, the enum must conform to the Codable protocol. In this article, we will learn how to use the Codable protocol to make an enum decodable in Swift What is the JSONDecoder Class? The JSONDecoder class is then ...
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