Classes/MyViewController.m

/*
     File: MyViewController.m
 Abstract: 
  Version: 1.8
 
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 */
 
#import "MyViewController.h"
 
 
@implementation MyViewController
 
@synthesize textField;
@synthesize label;
@synthesize string;
 
- (void)viewDidLoad {
    // When the user starts typing, show the clear button in the text field.
    textField.clearButtonMode = UITextFieldViewModeWhileEditing;
    // When the view first loads, display the placeholder text that's in the
    // text field in the label.
    label.text = textField.placeholder;
}
 
 
- (void)updateString {
    
    // Store the text of the text field in the 'string' instance variable.
    self.string = textField.text;
    // Set the text of the label to the value of the 'string' instance variable.
    label.text = self.string;
}
 
 
- (BOOL)textFieldShouldReturn:(UITextField *)theTextField {
    // When the user presses return, take focus away from the text field so that the keyboard is dismissed.
    if (theTextField == textField) {
        [textField resignFirstResponder];
        // Invoke the method that changes the greeting.
        [self updateString];
    }
    return YES;
}
 
 
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    // Dismiss the keyboard when the view outside the text field is touched.
    [textField resignFirstResponder];
    // Revert the text field to the previous value.
    textField.text = self.string; 
    [super touchesBegan:touches withEvent:event];
}
 
 
- (void)dealloc {
    // To adhere to memory management rules, release the instance variables.
    // 'textField' and 'label' are objects in the nib file and are created when the nib
    // is loaded.
    [textField release];
    [label release];
    [super dealloc];
}
 
 
@end