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; |
} |
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