Beginning iOS 5 Application Development

CHAPTER 6 EXERCISE SOLUTIONS

Answer to Question 1

First, handle the Did End on Exit event (or implement the textFieldShouldReturn: method in the View Controller). Then call the resignFirstResponder method of the UITextField outlet to release its first-responder status.

Answer to Question 2

Register for the notifications UIKeyboardDidShowNotification and UIKeyboardDidHideNotification.

Answer to Question 3

NSDictionary* info = [notification userInfo];

//---obtain the size of the keyboard---
NSValue *aValue = [info objectForKey:UIKeyboardFrameEndUserInfoKey];
CGRect keyboardRect =
    [self.view convertRect:[aValue CGRectValue] fromView:nil];

NSLog(@“%f”, keyboardRect.size.height);

Answer to Question 4

Use the UIScrollView to contain views so that the user can scroll through them. Then, set the new size of the scroll view:

- (void)viewDidLoad {
    //---set this to the screen size---
    scrollView.frame = CGRectMake(0, 0, 320, 460);

    //---set this to the final size of the scroll view---
    [scrollView setContentSize:CGSizeMake(320, 713)];

    [super viewDidLoad];
}