scrolling on view highlighting? - iphone

Question

I am trying to scroll through textarea fields in the view using a next button on top of the keyboard, when it shifts to the last textarea field it's scrolling downwards and hiding behind the keyboard.
code:
(CGRect)getObjectRectFromRoot {
int yOffset = 0;
yOffset += self.view.frame.origin.y;
UIView* suView = self.view.superview;
while (suView) {
yOffset += suView.frame.origin.y;
suView = suView.superview;
}
CGRect r;
r.size.width = 700;
r.size.height = 700;
r.size.width = self.view.frame.size.width;
r.size.height = self.view.frame.size.height;
r.origin.x = 0;
r.origin.y = yOffset;
return r;
}

Answer 1

Implementing this code in the two delegate methods of your textField will do what you want. Here is the textFieldDidBeginEditing:
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
CGRect textFieldRect =
[self.view.window convertRect:textField.bounds fromView:textField];
CGRect viewRect =
[self.view.window convertRect:self.view.bounds fromView:self.view];
CGFloat midline = textFieldRect.origin.y + 0.5 * textFieldRect.size.height;
CGFloat numerator =
midline - viewRect.origin.y
- MINIMUM_SCROLL_FRACTION * viewRect.size.height;
CGFloat denominator =
(MAXIMUM_SCROLL_FRACTION - MINIMUM_SCROLL_FRACTION)
* viewRect.size.height;
CGFloat heightFraction = numerator / denominator;
if (heightFraction < 0.0)
{
heightFraction = 0.0;
}
else if (heightFraction > 1.0)
{
heightFraction = 1.0;
}
UIInterfaceOrientation orientation =
[[UIApplication sharedApplication] statusBarOrientation];
if (orientation == UIInterfaceOrientationPortrait ||
orientation == UIInterfaceOrientationPortraitUpsideDown)
{
animatedDistance = floor(PORTRAIT_KEYBOARD_HEIGHT * heightFraction);
}
else
{
animatedDistance = floor(LANDSCAPE_KEYBOARD_HEIGHT * heightFraction);
}
CGRect viewFrame = self.view.frame;
viewFrame.origin.y -= animatedDistance;
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];
[self.view setFrame:viewFrame];
[UIView commitAnimations];
}
And here is the textFieldDidEndEditing:
- (void)textFieldDidEndEditing:(UITextField *)textField
{
CGRect viewFrame = self.view.frame;
viewFrame.origin.y += animatedDistance;
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];
[self.view setFrame:viewFrame];
[self textFieldShouldReturn:textField];
[UIView commitAnimations];
}
If you want it for the buttons you can just setup an IBAction with the above code.
The code can also be used with any other type of action or view you would like!