Here you can find the list of Assertions supported by XCTest and it is essential to know all these assertion if you are practicing Test Driven Development in IOS. You can get this list from XCTestAssertions.h XCTFail(<#format…#>) – This unconditionally fails the test. XCTAssertNil(<#a1#>, <#format…#>) – Failure message when object is not nil. XCTAssertNotNil(<#a1#>, <#format…#>) […]
Develop
Closures, Extensions and Generics in Swift
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 […]
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. […]
How to record and play sound in Swift
In this tutorial, we are going to see the required steps to record and play sound in Swift Programming language using AVAudioRecorder and AVAudioPlayer Download source code from github (SoundController.swift) User Interface The user interface for this demo is simple with two buttons, one for recording and another for playing sound. Create corresponding IBAction and […]
UITextFieldDelegate in Swift
This is a beginners tutorial on UITextFieldDelegate in Swift. We are going to see how to use UITextFieldDelegate by writing a Simple Interest Calculator. Download the source code from here This calculator uses UILabels and TextFields for displaying and accepting amount and interest. We are going to use the UITextFieldDelegate method to navigate from “Principal […]
Test Driven Development in Swift
Here is a beginner tutorial on TDD in Swift by writing a program that checks for a prime number. Let us start by creating a new project, selecting template as Single View Application. Though we won’t be adding anything to the storyboard as we will focus only on the business logic. After creating the project, […]
Enum in Swift
Enum group of related values to a single data type. Swift enum has lot of new features compared to its predecessor Objective-C. Let us see this with an example enum type for all Months in a year. enum Months { case January, February, March, April, May, June, July, August, September, October, November, December } […]