iOS Tutorial

In the previous article How To Draw Rectangle View Use Swift In the iOS App we have learned how to draw a rectangle, how to set the rectangle background color, and how to add the rectangle as the subview of the iOS app’s main view. But when we set the rectangle background color, we use

There are three kinds of variable declaration in swift programming. You can declare a swift variable as a variable (var name: String = “jerry”) that value can be changed in code, a constant ( let x:Int = Int(10) ) that value can not be changed, and an optional variable ( var x:Int? ) that value

This example will show you how to use a swift CGRect object to draw a rectangle in the iOS app, it also shows you how to add the rectangle as the subview of the app’s main container view. In this example, we will create a new project DrawRectangleView, and this project will be added to

When you develop an iOS application, sometimes you may need to create a SubView and add it into the iOS root view object programmatically. This article will just show you an example about how to do it.

After you develop and test your iOS app in the Xcode simulator, you also need to deploy your app to a real device such as iPhone or iPad device to run and test. Because some bugs only exist on the real device, so it is also necessary. This article will tell you how to do

When you create an iOS application with Xcode, the following two files play the primary role in the application development. AppDelegate.swift and ViewController.swift ( In Objective-C project the file are AppDelegate.h, AppDelegate.m, ViewController.h and ViewController.m). No matter swift or objective-c, the concept is the same.

When you add a UI component such as a button in the interface builder of the Xcode project, you can adjust it’s position by hand. For example, you place the button at the center position both horizontally and vertically. But when you preview the screen on different devices or in different screen orientations. You will