You would like to give your users the ability to turn an option on or off.
Use the UISwitch class.
The UISwitch class provides an On/Off control like the one shown in Figure 2-7 for Auto-Capitalization, Auto-Correction, and so on.
Figure 2-7. UISwitch used in the Settings app on an iPhone
In order to create a switch, you can either use Interface
Builder or simply create your instance in code. Let’s do it through
code. So next the challenge is to determine which class to place your
code in. It needs to be in a View Controller class, which we haven’t
discussed yet, but for the a Single View Application type of app we’re
creating in this chapter, you can find the view controller’s .h (header) file through a name that is
based on the name of your project and ends with ViewController.h. For instance, I have
named my project
Creating and Using Switches with
UISwitch, so the .h
file of my view controller is called Creating_and_Using_Switches_with_UISwitchViewController.h.
Open that file now.
In the latest version of Xcode, creating a Single View Application project will create the header and implementation files of a view controller simply named ViewController. Therefore the header file of your view controller will be in the file named ViewController.h and the implementation in a file named ViewController.m.
Let’s create ...