Question

Hi can someone help me create this feature, I would like to have a text box at the bottom of my app, and as soon as the user clicks on it, it should raise that text box to the middle of screen right above the keyboard. Similar to skype app, thanks!

Answer 1

Try This

#define kKeyboardAnimationDuration 0.3
@interface YourViewController:UIViewController
{
    BOOL keyboardIsShown;
}

And then in your implementation

- (void)viewDidLoad
{
// register for keyboard notifications
    [[NSNotificationCenter defaultCenter] addObserver:self 
                                             selector:@selector(keyboardWillShow:) 
                                                 name:UIKeyboardWillShowNotification 
                                               object:self.view.window];
    // register for keyboard notifications
    [[NSNotificationCenter defaultCenter] addObserver:self 
                                             selector:@selector(keyboardWillHide:) 
                                                 name:UIKeyboardWillHideNotification 
                                               object:self.view.window];

    keyboardIsShown = NO;
}

- (void)viewDidUnload
{
[super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;

    // unregister for keyboard notifications while not visible.
    [[NSNotificationCenter defaultCenter] removeObserver:self 
                                                    name:UIKeyboardWillShowNotification 
                                                  object:nil]; 
    // unregister for keyboard notifications while not visible.
    [[NSNotificationCenter defaultCenter] removeObserver:self 
                                                    name:UIKeyboardWillHideNotification 
                                                  object:nil]; 
}

#pragma mark - Keyboard Events
- (void)keyboardWillShow:(NSNotification *)n
{
    if (keyboardIsShown) 
    {
        return;
    }

    NSDictionary* userInfo = [n userInfo];
    CGSize keyboardSize = [[userInfo objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

    CGRect viewFrame = self.view.frame;
    viewFrame.origin.y-= (keyboardSize.height);

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationBeginsFromCurrentState:YES];
    [UIView setAnimationDuration:kKeyboardAnimationDuration];
    [self.view setFrame:viewFrame];
    [UIView commitAnimations];

    keyboardIsShown = YES;
}

- (void)keyboardWillHide:(NSNotification *)n
{
    NSDictionary* userInfo = [n userInfo];
    CGSize keyboardSize = [[userInfo objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

    CGRect viewFrame = self.view.frame;
    viewFrame.origin.y+= (keyboardSize.height);

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationBeginsFromCurrentState:YES];
    [UIView setAnimationDuration:kKeyboardAnimationDuration];
    [self.view setFrame:viewFrame];
    [UIView commitAnimations];

    keyboardIsShown = NO;
}