Beginning iPhone® SDK Programming with Objective-C®

Appendix A. Answers to Exercises

This appendix provides the solutions for the end-of-chapter exercises located at the end of each chapter, except Chapter 1.

CHAPTER 2 EXERCISE SOLUTIONS

Answer to Question 1

The minimum image size you should design is 57 × 57 pixels. It is all right to design a larger image because the iPhone automatically resizes it for you. In general, try to design a larger image because doing so prepares your application for the newer devices that Apple may roll out.

Answer to Question 2

You should implement the shouldAutorotateToInterfaceOrientation: method and code the appropriate statements to support the orientation you want. To support all orientations, simply return a YES in this method, like this:

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)
interfaceOrientation {
    // Return YES for supported orientations
    return YES;
}

CHAPTER 3 EXERCISE SOLUTIONS

Answer to Question 1

In the .h file:

//---declare an outlet---
IBOutlet UITextField *nameTextField;
//...
//...
//---expose the outlet as a property---
@property (nonatomic, retain) UITextField *nameTextField;

In the .m file:

@implementation BasicUIViewController
//---generate the getters and setters for the property---
@synthesize nameTextField;

Answer to Question 2

In the .h file:

- (IBAction)btnClicked:(id)sender;

In the .m file:

@implementation BasicUIViewController
//...
//...
- (IBAction)btnClicked:(id)sender {
    //---your code for the action here---
}

CHAPTER 4 EXERCISE SOLUTIONS

Answer to Question ...