UITextView: characters count is not right when the backspace is typed in

Question

I want to show the characters number when I type in a UITextView. But I'm confused when I presse the delete/backspace key.

I use:

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text

My code is:

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
    NSLog(@"input %d chars",textView.text.length + 1);
    return YES;
}

When I type in hello, it shows 'input 5 chars'; But if I click the delete/backspace key, the number become 6, not 4. What's the matter with this? How I can know the exact number of chars in the UITextView when I type in?

Answer 1

It's pretty obvious :)

You're outputting the length+1

textView.text.length + 1

but a backspace doesn't make the length 1 longer, it makes it 1 shorter!

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text

    // Do the replacement
    NSString *newText = [textView.text stringByReplacingCharactersInRange:range withString:text];

   // See what comes out
    NSLog(@"input %d chars", newText.length);

    return YES;
}