UITextView: move view when keyboard appears
For showing the textview fields without being hidden by the keyboard, the standard way is to move up/down the view having text fields whenever the keyboard is shown.
The following simple steps is used to move up/down the UITextField in your iPhone.
Step 1: Set the UITextViewDelegate, and tag the textViewFields (in your
.h file)
Step 2: Place "
CGFloat animatedDistance;" in to inside the interface (in your
.h file)
Step 3: Define the following values in top of your
.m file (after @implimentation)
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;
Step 4: And finally add the following code into your
.m file
-(void) textViewDidBeginEditing:(UITextView *)textView {
CGRect textFieldRect = [self.view.window convertRect:textView.bounds fromView:textView];
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)textViewDidEndEditing:(UITextView *)textView{
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)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
if([text isEqualToString:@"\n"])
{
[textView resignFirstResponder];
return NO;
}
return YES;
}
iphone - How to dismiss keyboard for UITextView with return key:
Did you saw the last para of the above code snippets?, that is used to hide the iphone keypad when clicking return key.
-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
if([text isEqualToString:@"\n"])
{
[textView resignFirstResponder];
return NO;
}
return YES;
}
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