UITextView - scroll while editing?

[bint]

Hello,

I've got a big UITextView, nearly full screen. If I tap it, the keyboard pops up and I can edit the text. However, the longer I type, eventually the text runs down the view, behind the keyboard. I can no longer see what I'm typing.

How do you deal with this? Do you have to track the cursor position and scroll the view manually?

Thanks!
B

[Tedeks]

Originally Posted by bint

Hello,

I've got a big UITextView, nearly full screen. If I tap it, the keyboard pops up and I can edit the text. However, the longer I type, eventually the text runs down the view, behind the keyboard. I can no longer see what I'm typing.

How do you deal with this? Do you have to track the cursor position and scroll the view manually?

Thanks!
B

Has anyone solved this? Running into the same problem.

[FlyingDiver]

Search the forum for keyboard handling. Basically, you want to shift your textview up so it's not hidden by the keyboard at all. No point in it remaining full screen behind the keyboard.

Here's some code I used to accomplish this:

// the amount of vertical shift upwards keep the Notes text view visible as the keyboard appears
#define kOFFSET_FOR_KEYBOARD					140.0

// the duration of the animation for the view shift
#define kVerticalOffsetAnimationDuration		0.50

- (IBAction)textFieldDoneEditing:(id)sender
{
	[sender resignFirstResponder];
}

- (IBAction)backgroundClick:(id)sender
{
	[latitudeField resignFirstResponder];
	[longitudeField resignFirstResponder];
	[notesField resignFirstResponder];
	
	if (viewShifted)
	{
		[UIView beginAnimations:nil context:NULL];
		[UIView setAnimationDuration:kVerticalOffsetAnimationDuration];

		CGRect rect = self.view.frame;
		rect.origin.y += kOFFSET_FOR_KEYBOARD;
		rect.size.height -= kOFFSET_FOR_KEYBOARD;
		self.view.frame = rect;

		[UIView commitAnimations];
		
		viewShifted = FALSE;
	}		
}

- (BOOL)textViewShouldBeginEditing:(UITextView *)textView
{
	if (!viewShifted) {		// don't shift if it's already shifted
		
		[UIView beginAnimations:nil context:NULL];
		[UIView setAnimationDuration:kVerticalOffsetAnimationDuration];

		CGRect rect = self.view.frame;		
		rect.origin.y -= kOFFSET_FOR_KEYBOARD;
		rect.size.height += kOFFSET_FOR_KEYBOARD;
		self.view.frame = rect;

		[UIView commitAnimations];
		
		viewShifted = TRUE;
	}
	return YES;
}

It's not really the best way to do it, but it works. One of the big problems you'll see in a lot of the published solutions (to keyboard handling) is that they don't account for multiline text fields, and assume that you can hook the return button to hide the keyboard and restore the text view.

joe

[Tedeks]

I'm looking to scroll a text view when there is a link break. I've got the code to scroll, just don't have a way to capture the line breaks.

[Vengeance]

Originally Posted by Tedeks

I'm looking to scroll a text view when there is a link break. I've got the code to scroll, just don't have a way to capture the line breaks.

I found this code on another site and it looks like it would do what you need:

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range 
 replacementText:(NSString *)text
{
    // Any new character added is passed in as the "text" parameter
    if ([text isEqualToString:@"\n"]) {
        // Do your scrolling stuff here in response to the "Enter" pressed
		
        // Return FALSE so that the final '\n' character doesn't get added
        return TRUE;
    }
    // For any other character return TRUE so that the text gets added to the view
    return TRUE;
}

Hope it helps.

[rnieves]

Resize your UITextViews frame when editing begins so that it will automatically scroll when you start approaching the keyboard.

Do this on:
- (BOOL)textViewShouldBeginEditingUITextView *)textView


This is what I do and it is pretty simple and straightforward.

Resize it back to the normal on:
- (BOOL)textViewShouldEndEditingUITextView *)textView;

[sd-0]

Go to this developer article provided by Apple and it will tell exactly what to do.