Beginning iOS 5 Application Development

SUMMARY

This chapter explored the roles played by outlets and actions in an iPhone application. Outlets and actions are the cornerstone of iOS development, so understanding theiruse is extremely important. Throughout this book, you will come across them frequently. You have also seen the use of some of the commonly used views in the Library.

In the next chapter, you learn about the various types of View controllers supported by the iOS SDK, and how you can use them to build different types of iPhone and iPad applications.

EXERCISES

1. Declare and define an outlet for a UITextField view using code.
2. Declare and define an action using code.
3. When do you use an alert view and when do you use an action sheet?
4. Create a UIButton from code and wire its Touch Up Inside event to an event handler.

   Answers to the exercises can be found in Appendix D.

WHAT YOU LEARNED IN THIS CHAPTER

TOPIC	KEY CONCEPTS
Action	An action is a method that can handle events raised by views (for example, when a button is clicked, etc.) in the View window.
Outlet	An outlet allows your code to programmatically reference a view on the View window.
Adding outlet using code	Use the IBOutlet keyword: IBOutlet UITextField *txtName;
Adding action using code	Use the IBAction keyword: (IBAction) btnClicked:(id) sender;
Connecting actions	To link actions, you commonly drag from the view in the View window onto ...