Closures Closures are self contained lines of code that can be passed around the application and similar to blocks in Objective-C. A typical closure syntax in Swift looks as shown below Closure Syntax [code language=”swift”]{ (parameters) -> return type in statements }[/code] Example closure in Swift [code language=”swift”]{ (name:String, message:String -> (String) in message + […]
Tuples, Enums and Protocols in Swift
Tuples in Swift allows user to assign group of values to a variable, constant and even return parameter of a function. In the below example, a employee constant is assigned Int and String values. And to access these parameters, we need to use .0 and .1 [code language=”swift”]let employee = (103, “Deepak”) employee.0 employee.1[/code] Now […]
Class and Struct in Swift
Download the playground file from github (Classes and Struct) Class A class is a blue print for a real-word entity such Player, Person etc. and it is used for creating objects. Class can have properties to store values and methods to add behaviour. Let us see this with an example class called Rectangle which has […]
Swift – Beginners Tutorial
Swift is the latest programming language released by Apple for developing OS X and iOS apps. Best of C and Objective-C Adopts safe programming patterns and modern features Supports Playground, a tool for seeing the result immediately. Provides access to Cocoa libraries and can work in conjunction with Objective-C Combines Procedural and Object-Oriented programming. No […]
Optional binding and Optional Chaining
Swift has a feature that lets users to assign optional value to a variable or a constant. Optional variable or constant can contain a value or a nil value. Let us take the following example which tries to find a given string in a array of string. Optional Binding [code language=”swift”]var fruits = ["Apple","Orange","Grape","Mango"] let […]
How to display line numbers in Xcode
Listed below are the steps to display line number in Xcode editor window. This is quite useful when you are working in a ground and want to communicate the line number of statement to other members. Click Xcode menu option and select Preferences from the menu list In the Preferences window, click Text Editing tab. […]
XCode Playground Overview
Playground is an interactive work environment that allows you to see the values in the sidebar for the written code. As and when you make changes to your code the sidebar reflects the changed result. Listed below are some examples written using Swift language in Playground Sum of n numbers [code language=”swift”]var sum = 0 […]
Retrieve list of Twitter followers using Swift
This article provides details about the the steps required to retrieve the followers in from your twitter account. You will learn the following by going through this article Use oAuth to retrieve bearer token. Retrieve twitter followers using API call. Last 20 followers name and profile image will be displayed in a tableview. Download the […]