IOS : View height is getting reduced when performing animation - ios

Question

I have the following code for moving the view up and down when keyboard appears on a text field.
-(void)textFieldDidBeginEditing:(UITextField *)textField{
NSLog(#"height before animation%f",self.view.frame.size.height);
NSLog(#"%f",self.view.frame.size.height);
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
[self.view setFrame:CGRectMake(0,-216,320,460)];
[UIView commitAnimations];
}
-(void)textFieldDidEndEditing:(UITextField *)textField{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
[self.view setFrame:CGRectMake(0,0,320,460)];
[UIView commitAnimations];
NSLog(#"height after animation %f",self.view.frame.size.height);
}
Here's a sample log I get when keyboard appears and then editing is finished :
2014-01-21 11:00:51.194 Master-view[456:70b] height before animation 568.000000
2014-01-21 11:00:53.635 Master-view[456:70b] height after animation 460.000000
The height of the view seems to get reduced which is making bottom part of the screen non-interactable. Why is this happening ?
View is moving up and is coming down too without issue. Also visually there appears to be no difference. All elements which were there before moving up are there after coming down. But the elements at bottom of the screen ( beyond the height of 460.0) are not intractable.

Answer 1

-(void)textFieldDidBeginEditing:(UITextField *)textField{
NSLog(#"height before animation%f",self.view.frame.size.height);
NSLog(#"%f",self.view.frame.size.height);
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
[self.view setFrame:CGRectMake(0,-216,320,self.view.frame.size.height)];
[UIView commitAnimations];
}
-(void)textFieldDidEndEditing:(UITextField *)textField{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
[self.view setFrame:CGRectMake(0,0,320,self.view.frame.size.height)];
[UIView commitAnimations];
NSLog(#"height after animation %f",self.view.frame.size.height);
}
I set the frame as per view height you only change the y position when key beginediting and try to set it back when end editing
may this help you

Answer 2

Try changing like
-(void)textFieldDidBeginEditing:(UITextField *)textField{
NSLog(#"height before animation%f",self.view.frame.size.height);
NSLog(#"%f",self.view.frame.size.height);
CGRect viewFrame = self.view.frame;
viewFrame.origin.y = -216;
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
[self.view setFrame:viewFrame];
[UIView commitAnimations];
}
-(void)textFieldDidEndEditing:(UITextField *)textField{
CGRect viewFrame = self.view.frame;
viewFrame.origin.y = 0;
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
[self.view setFrame:viewFrame];
[UIView commitAnimations];
NSLog(#"height after animation %f",self.view.frame.size.height);
}

Answer 3

We use NSNotification keyboard will show and keyboard will hide for that.
we use add notification for keyboard show and hide we add in viewWillAppear a notification and remove Notification in viewWillDisappear.
-(void)viewWillAppear:(BOOL)animated{**
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(keyboardWillShow)
name:UIKeyboardWillShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(keyboardWillHide)
name:UIKeyboardWillHideNotification
object:nil];
}
- (void)viewWillDisappear:(BOOL)animated**
{
[[NSNotificationCenter defaultCenter] removeObserver:self
name:UIKeyboardWillShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:UIKeyboardWillHideNotification
object:nil];
}
-(void)keyboardWillShow {
if (self.view.frame.origin.y >= 0)
{
[self setViewMovedUp:YES];
}
else if (self.view.frame.origin.y < 0)
{
[self setViewMovedUp:NO];
}
}
-(void)keyboardWillHide {
if (self.view.frame.origin.y >= 0)
{
[self setViewMovedUp:YES];
}
else if (self.view.frame.origin.y < 0)
{
[self setViewMovedUp:NO];
}
}
-(void)setViewMovedUp:(BOOL)movedUp
{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
CGRect rect = self.view.frame;
if (movedUp)
{
rect.origin.y -= kOFFSET_FOR_KEYBOARD;
rect.size.height += kOFFSET_FOR_KEYBOARD;
}
else
{
rect.origin.y += kOFFSET_FOR_KEYBOARD;
rect.size.height -= kOFFSET_FOR_KEYBOARD;
}
self.view.frame = rect;
[UIView commitAnimations];
}