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Articles by Nitin Aggarwal
Page 9 of 14
ReactiveCocoa vs RxSwift - pros and cons?
You can use the reactive programming frameworks in iOS application development. To use it, the ReactiveCocoa and RxSwift frameworks are the best options to implement the features. Both frameworks provide a way to handle asynchronous events and data streams and are similar in many ways. What is ReactiveCocoa? You can use the ReactiveCocoa framework to adopt the reactive programming in your iOS, macOS, and watchOS platforms. Using reactive programming, you can handle asynchronous events and data streams easily. This framework has been built on top of Objective-C language. This framework provides you with some tools to work with streams of ...
Read MoreProgrammatically set the initial view controller using Storyboards
What are Storyboards in Swift? In Swift, the Storyboard is a tool that provides you with a user interface to design the UIs of your application. It provides you with a visual representation of all the screens and the connections between them. You can connect all the layout components in your controller classes easily using Storyboard. What is instantiateViewController(withIdentifier:)? You can set the initial view controller programmatically using the instantiateViewController(withIdentifier:) method of the UIStoryboard class. This method takes an identifier string as a parameter, which should match the storyboard ID of the view controller you want to set as the ...
Read MoreMention what are the type of integers does Swift have?
In Swift, there are different types of integers − Int − A signed integer with a size equal to the native word size of the computer (32 or 64 bits depending on the platform). Signed integer types with a range of bit sizes include Int8, Int16, Int32, and Int64. UInt − An unsigned integer type with the same native word size as the hardware (32 or 64 bits depending on the platform). Unsigned integer types with designated bit sizes are UInt8, UInt16, UInt32, and UInt64. Here are some examples of using each of the integer types in Swift ...
Read MoreHow to provide a localized description with an Error type in Swift?
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 MoreHow to enumerate an enum with String type?
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 MoreHow to check the OS version in Swift?
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 MoreHow to append elements to a dictionary in Swift?
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 MoreHow do you use String.substringWithRange? (or, how do Ranges work in Swift?)
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..
Read MoreHow can I use Timer (formerly NSTimer) in Swift?
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 MoreHow can I make a weak protocol reference in 'pure' Swift (without @objc)?
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 ...
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