Swift - #NeedOne (Page 2)

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Swift

A collection of 39 posts

Workplace, Project, Scheme and Target in iOS development

Workplace, Project, Scheme and Target in iOS development

Many of us have seen workspace, project, target and scheme quite often while doing the iOS development, but what are they exactly and how are they related with each other? Workplace Workplace in Xcode is a tool for managing and organizing your project files. It allows you to easily navigate

Equatable and Comparable in Swift

Equatable and Comparable in Swift

It is quite common that we are required to compare two custom objects in Swift, luckily Swift has provided some built-in protocol allows us to do this in a "swift" way. Equatable In Swift, Equatable is a protocol that allows us to determine whether two reference objects are

Difference between layoutIfNeeded vs. setNeedsLayout

Difference between layoutIfNeeded vs. setNeedsLayout

As many of iOS developer known, layoutIfNeeded and setNeedsLayout are two methods that can be used to update the layout of a view and its subviews. But what are their differences? Today's article will help this out: LayoutIfNeeded layoutIfNeeded is a method that forces the view to immediately

Constructor Injection, Property Injection vs. Method Injection

Constructor Injection, Property Injection vs. Method Injection

Dependency Injection is a design pattern that is providing another object with its dependencies, instead of having the object created or managed themselves. There are three main types of dependency injection: constructor injection, property injection, and method injection. Constructor injection As the name indicated, constructor injection is passing the dependencies

Type safe in programming language

Type safe in programming language

Introduction Type safety in programming languages refers to the concept that variables and data structures are strongly typed and cannot be assigned values of different types. This means that the programming language will not allow the programmer to accidentally or intentionally assign a incorrect type to a variable or data

ContentHugging vs. ContentCompressionResistance in UIStackView

ContentHugging vs. ContentCompressionResistance in UIStackView

In Swift, it is quite common to see ContentHugging and ContentCompressionResistance either when we are using the storyboard or code to render the user interfaces in UIStackView. Those 2 properties determine how a view can automatically adjust its size with the content give, such as dynamic & long text, images

A summary of use enum in Swift

A summary of use enum in Swift

Enumeration type is a common type in many programming languages, which normally presents a set of limited status for a program, such as list all the directions for a compass: enum CompassPoint { case north case south case east case west } However, enum provides more features than that: 1. Static values

Use Extension in Swift

Use Extension in Swift

Extension is a great feature in Swift, which can help us to create helper/utility variables and method, and etc. Use extension to conform protocols It is quite common to use protocols in any project, with extension, we can make the code more organized. extension CollectionViewController: UITableViewDelegate, UITableViewDataSource { // necessary methods

Property in Swift

Property in Swift

Unlike other programming languages, there are three types properties in Swift. Stored Properties They are constants or variables of a class, and part of the class instances that used to store values. One of the examples is the model class. class Car { var name: String var price: Float = 0.0

Keyword Lazy in Swift

Keyword Lazy in Swift

lazy variables are variables will be computed until accessing. In other words, lazy variables won't have the real value until get called/used. As lazy variables can be re-assigned, so it can't be used on constants which normally defined by let. One example of using lazy

Preview in SwiftUI

Preview in SwiftUI

Once you have finished the SwiftUI code, it is always a good idea to preview it before implement any function code. Luckily, such feature is natively supported by SwiftUI - PreviewProvider: Example of showing previews: import SwiftUI struct PurchaseButtonView: View { var title: String var callback: () -> Void var body:

Complete guide on custom class/struct comparison

Complete guide on custom class/struct comparison

swift compare custom class or custom struct

Singleton in Objective-C/Swift

What is behind the Singleton? Singleton: Instantiation of a class to ONLY one object Features of Singleton: 1. One class only can have only one instance; 2. It must can create this instance automatically; 3. This instance must be provided to other objects. Benefits of Singleton: All objects can only

viewWillAppear, viewDidAppear, viewDidLoad, viewWillDisappear and viewDidDisappear?

Introduction Before this, let me ask you what is the running order of viewWillAppear, viewDidAppear, viewDidLoad, viewWillDisappear and viewDidDisappear? If you know the answer, please close this webpage and continue your game. :) So a simple piece code is written to verify this: Example code: // // ViewController.m // TestBlock // // Created by Ben