키패드 사용시 해당 UITextField 가 스크롤링 되어 위로 올라가도록 한다

Listing 4-1  Handling the keyboard notifications

// Call this method somewhere in your view controller setup code.

- (void)registerForKeyboardNotifications

{

[[NSNotificationCenter defaultCenter] addObserver:self

selector:@selector(keyboardWasShown:)

name:UIKeyboardDidShowNotification object:nil];

[[NSNotificationCenter defaultCenter] addObserver:self

selector:@selector(keyboardWillBeHidden:)

name:UIKeyboardWillHideNotification object:nil];

}

// Called when the UIKeyboardDidShowNotification is sent.

- (void)keyboardWasShown:(NSNotification*)aNotification

{

NSDictionary* info = [aNotification userInfo];

CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0);

scrollView.contentInset = contentInsets;

scrollView.scrollIndicatorInsets = contentInsets;

// If active text field is hidden by keyboard, scroll it so it's visible

// Your application might not need or want this behavior.

CGRect aRect = self.view.frame;

aRect.size.height -= kbSize.height;

if (!CGRectContainsPoint(aRect, activeField.frame.origin) ) {

CGPoint scrollPoint = CGPointMake(0.0, activeField.frame.origin.y-kbSize.height);

[scrollView setContentOffset:scrollPoint animated:YES];

}

}

// Called when the UIKeyboardWillHideNotification is sent

- (void)keyboardWillBeHidden:(NSNotification*)aNotification

{

UIEdgeInsets contentInsets = UIEdgeInsetsZero;

scrollView.contentInset = contentInsets;

scrollView.scrollIndicatorInsets = contentInsets;

}