Calculating how much to scroll up from keyboard height UITableview - ios

Question

I have UIScrollView and UITextField like this. I know how to get keyboard height shown in my self.view. However, UITextField position will not be fixed at particular position since user may scroll.
How can I move up the uitextfield only if it is covered by keyboard? Do I need to use CGPoint and convertPoint? May I know how to do?

Answer 1

You should use UITextFieldDelegate.
Here is an example how you can implement it :
-(void)textFieldDidBeginEditing:(UITextField *)textField {
if(!moved) {
[self animateViewToPosition:self.view directionUP:YES];
moved = YES; }
}
-(void)textFieldDidEndEditing:(UITextField *)textField {
if(moved) {
[self animateViewToPosition:self.view directionUP:NO];
moved = NO;
}
[textField resignFirstResponder];
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField {
[textField resignFirstResponder];
if(moved) {
[self animateViewToPosition:self.view directionUP:NO];
}
moved = NO;
return YES;
}
-(void)animateViewToPosition:(UIView *)viewToMove directionUP:(BOOL)up {
const int movementDistance = -260; // tweak as needed
const float movementDuration = 0.3f; // tweak as needed
int movement = (up ? movementDistance : -movementDistance);
[UIView beginAnimations: #"animateTextField" context: nil];
[UIView setAnimationBeginsFromCurrentState: YES];
[UIView setAnimationDuration: movementDuration];
viewToMove.frame = CGRectOffset(viewToMove.frame, 0, movement);
[UIView commitAnimations];
}

Answer 2

// 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 app might not need or want this behavior.
CGRect aRect = self.view.frame;
aRect.size.height -= kbSize.height;
if (!CGRectContainsPoint(aRect, activeField.frame.origin) ) {
[self.scrollView scrollRectToVisible:activeField.frame animated:YES];
}
}
// Called when the UIKeyboardWillHideNotification is sent
- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
UIEdgeInsets contentInsets = UIEdgeInsetsZero;
scrollView.contentInset = contentInsets;
scrollView.scrollIndicatorInsets = contentInsets;
}

Answer 3

it may help if you some one wants to try but it may not the best solution
-(void)textFieldDidBeginEditing:(UITextField *)textField
{
CGRect actualframe = [textField convertRect:[textField bounds] toView:self.view];
if ((actualframe.origin.y) >= (self.view.frame.size.height-keyboardheignt))
{
CGRect scrollfrm = [textField convertRect:[textField bounds] toView:tableview];
[tableview setContentOffset:CGPointMake(0, scrollfrm.origin.y) animated:YES];//60
}
}
you have to use the content inset if the textfield is last row of the table