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Swift Articles
Page 11 of 40
Swift Program to Merge Two Sets
Merging two sets means combining all the elements of a set into another set without any duplicates. In Swift, we can either use formUnion() function or for-in loop to merge the elements of two sets. Lets discuss both the methods in detail along with examples. Method 1: Using formUnion() Function To merge two sets we can use formUnion() function. The formUnion() function is used to insert the elements of the given sequence into the set. Here the sequence can be anything a set, array, etc. This function merge two sets without any duplicates. Syntax set1.formUnion(set2) Where set1 and set2 ...
Read MoreSwift Program to Initializing a Set
In Swift, a set is used to define a collection of unique elements, means a set doesn’t contains duplicate elements. In a set, the elements are not arranged in a particular order. Initialising a set means to store some information in the set. It can be done at the time of declaration or after declaration. We can initialise a set in various way like initialising a set without explicitly passing data types, initialising a set with explicitly passing data types, and using inbuilt insert() function. Now lets discuss all the method in detail along with examples. Method 1 In this ...
Read MoreSwift Program to Implement Linear Search Algorithm
In Swift, the Linear search algorithm is the easiest search algorithm. In a linear search algorithm, searching starts from index 0 and checks all the elements of the given array/sequence one by one until the desired element is found. If the desired element is found, then return the index of that element. If the desired element is not found, then return null. For example − We have an element M = 13, now we search M in the following array using a linear search algorithm − The linear search algorithm starts from index 0 and compares M=13 with ...
Read MoreSwift Program to Implement Binary Search Algorithm
In swift, Binary search algorithm is used to search element from the sorted array. It repeatedly divides the search interval into half and then search the specified element. In the binary search algorithm, the input array must be in sorted order to reduce the time complexity. Algorithm Step 1 − Create a function to implement a binary search algorithm. Step 2 − Inside the function, first we find the lower bound and upper bound range of the given array. Step 3 − Run a while loop till LBound
Read MoreWhat is the Swift equivalent of respondsToSelector?
In Swift, the equivalent of the Objective-C method respondsToSelector is the responds property of the NSObject class. To check if an object responds to a particular selector, you can use the responds(to:) method which is declared in the NSObjectProtocol. Here's the syntax − if objectName.responds(to: #selector(methodName)) { // do something if the object responds to methodName } else { // do something else if the object doesn't respond to methodName } In this syntax, objectName is the object that you want to check, and methodName is the selector that you want to check ...
Read MoreWhy is the Convenience Keyword Even Needed in Swift?
In Swift, you can create an additional initializer to provide default values for the properties. You can use the convenience keyword to add this functionality. Let's look at some examples of how to use a convenience initializer in the Swift language. What is a convenience initializer in Swift? In Swift, a secondary initializer in a class that provides extra or alternative ways to create an instance of that class is marked with the convenience keyword. The initialization procedure is streamlined and made simpler, which makes it easier for the developer to deal with the class. The designated initializer of the ...
Read MoreWhat\'s the equivalent of NSLocalizedString in Swift?
In real iOS applications, you often need to support localization to ensure the app's accessibility around the world. By incorporating localization into your app, you can gain more users. In Swift, we use the NSLocalizedString function to create a localized string. What is localization? Localization is the process of allowing various language support in your apps. Instead of utilizing the software in a single language, it helps to create a more localized experience for users. Localization will be quite simple to integrate in your application. Apple offers a totally native method for integrating localization in your program.Syntax The syntax for ...
Read MoreSwift: Pass an array by reference?
In Swift, you can pass an array by reference in a function as an argument using inout keyword. In Swift, arrays are value types by default. In other words, they pass a value rather than a reference. If you pass an array to a function as an argument, it makes a copy and passes that copy to the function. First, let's understand what happens when we pass an array in a function as a value. func passByValue(_ array: [Int]) { array.append(100) } let numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] passByValue(numbers) ...
Read MoreSwift JSONDecode decoding arrays fail if single element decoding fails
In Swift, working with JSON objects is very easy with the JSONDecoder class. It is always necessary to create model classes or structs with the Codable protocol. One single mistake leads you to fail to decode the complete JSON object. Let's explore some examples to understand when this failure might occur and how you can handle it in Swift. What is the JSONDecoder class? The JSONDecoder class is then used to parse the JSON data from the file into an instance of the given Type either a class or structure. The decode(_:from:) method is used to deserialize the JSON data, ...
Read MoreObjective-C and Swift URL encoding
URL encoding is an essential part of iOS app development. Many times, you will need to encode the URL to communicate with servers. Let's look at some examples of how you can encode an URL in Swift and Objective-C. URL Encoding in Swift In Swift, you can use the addingPercentEncoding(withAllowedCharacters:) method for URL encoding. URL Encoding in Objective-C In Objective-C, you can use the stringByAddingPercentEncodingWithAllowedCharacters method for URL encoding. Encode a URL in Objective-C In Objective-C, you can encode a URL string using the stringByAddingPercentEncodingWithAllowedCharacters: method of the NSString class. Here's an example NSString *stringToEncode = @"https://www.exampleserver.com/complete path with spaces"; ...
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