Posted By

vaishnavi on 12/09/10

Tagged

Versions (?)

Last Edited at 12/09/10 06:20pm

Statistics

Viewed 511 times

Favorited by 3 user(s)

Related snippets

Automate the position of UITextField w.r.t the keyboard

/ Published in: Objective C

move the position of the textfield with respect to the position of the keyboard. After the last textfield has some text entered, resign the keyboard from the view

Highlighted TextExpand

CGFloat animatedDistance;
static const CGFloat KEYBOARD_ANIMATION_DURATION = 0.3;
static const CGFloat MINIMUM_SCROLL_FRACTION = 0.2;
static const CGFloat MAXIMUM_SCROLL_FRACTION = 0.8;
static const CGFloat PORTRAIT_KEYBOARD_HEIGHT = 216;
static const CGFloat LANDSCAPE_KEYBOARD_HEIGHT = 162;

- (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];
	
}

- (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];
    
    [UIView commitAnimations];
}

- (BOOL)textFieldShouldReturn:(UITextField *)theTextField {

}

Report this snippet Tweet

Comments

Subscribe to comments

Comment:

You need to login to post a comment.