set the navigation bar title while user enters text (like in the Notes app)

[franium]

Hi,
I have a textview and I would that while the user enters text, the first line of it becomes the navigation bar title.
I have this code:

- (void)textViewDidChange:(UITextView *)textView {
	self.navigationItem.title = textView.text;
}

In this way I see the title change dynamically with the text.
Only one more thing I'd like to have, that is stopping the update if the user enters a newline.
For example, if the user enters in the textview
"It's a title\nAnd then there are other words"
I'd like to see in the title only:
"It's a title"
while now there is something like this:
"It's a title And then there are..."

Any ideas?
Thanks,
Fran

[JoeBlaze]

Try this code

-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
	NSMutableString *newString = [NSMutableString stringWithString:textView.text];
	[newString replaceCharactersInRange:range withString:text];
	NSRange newLineRange = [newString rangeOfCharacterFromSet:[NSCharacterSet newlineCharacterSet]];
	
	if(newLineRange.length > 0)
	{
		self.title = [newString substringToIndex:newLineRange.location];
	}
	else {
		self.title = textView.text;
	}
	
	return YES;
}

[mickm]

Originally Posted by franium

Hi,
I have a textview and I would that while the user enters text, the first line of it becomes the navigation bar title.
I have this code:

- (void)textViewDidChange:(UITextView *)textView {
	self.navigationItem.title = textView.text;
}

In this way I see the title change dynamically with the text.
Only one more thing I'd like to have, that is stopping the update if the user enters a newline.
For example, if the user enters in the textview
"It's a title\nAnd then there are other words"
I'd like to see in the title only:
"It's a title"
while now there is something like this:
"It's a title And then there are..."

Any ideas?
Thanks,
Fran

- (void)textViewDidChange:(UITextView *)textView {
    
    NSRange range = [textView.text rangeOfCharactersInSet:[NSCharacterSet newlineCharacterSet]];
    if (range.location == NSNotFound) 
        self.navigationItem.title = textView.text;

}

that should do it...

[JoeBlaze]

The code I posted can be copied outside of that method and placed directly in your

- (void)textViewDidChange:(UITextView *)textView

and you can skip using the newString variable and use textView.text. My intent on using

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

is so that you could check the range early and see if they modified any text in the first line but I just did not implement that.

[franium]

Originally Posted by mickm

- (void)textViewDidChange:(UITextView *)textView {
    
    NSRange range = [textView.text rangeOfCharactersInSet:[NSCharacterSet newlineCharacterSet]];
    if (range.location == NSNotFound) 
        self.navigationItem.title = textView.text;

}

that should do it...

It works, but if the first line changes the title doesn't.

[franium]

Originally Posted by JoeBlaze

Try this code

-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
	NSMutableString *newString = [NSMutableString stringWithString:textView.text];
	[newString replaceCharactersInRange:range withString:text];
	NSRange newLineRange = [newString rangeOfCharacterFromSet:[NSCharacterSet newlineCharacterSet]];
	
	if(newLineRange.length > 0)
	{
		self.title = [newString substringToIndex:newLineRange.location];
	}
	else {
		self.title = textView.text;
	}
	
	return YES;
}

Thanks.
The only thing is that there is one char delay. I'll do some tries to fix this.

[franium]

Originally Posted by JoeBlaze

The code I posted can be copied outside of that method and placed directly in your

- (void)textViewDidChange:(UITextView *)textView

and you can skip using the newString variable and use textView.text. My intent on using

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

is so that you could check the range early and see if they modified any text in the first line but I just did not implement that.

Thanks, thanks, thanks
Using

- (void)textViewDidChange:(UITextView *)textView {
	NSRange newLineRange = [textView.text rangeOfCharacterFromSet:[NSCharacterSet newlineCharacterSet]];
	
	if (newLineRange.length > 0) {
		self.navigationItem.title = [textView.text substringToIndex:newLineRange.location];
	} else {
		self.navigationItem.title = textView.text;
	}
}

seems perfect.

[franium]

Originally Posted by franium

Thanks, thanks, thanks
Using

- (void)textViewDidChange:(UITextView *)textView {
	NSRange newLineRange = [textView.text rangeOfCharacterFromSet:[NSCharacterSet newlineCharacterSet]];
	
	if (newLineRange.length > 0) {
		self.navigationItem.title = [textView.text substringToIndex:newLineRange.location];
	} else {
		self.navigationItem.title = textView.text;
	}
}

seems perfect.

There is only a problem if the user deletes the first line, in this way the title is empty. How could I manage this?

[JoeBlaze]

Originally Posted by franium

There is only a problem if the user deletes the first line, in this way the title is empty. How could I manage this?

Trim characters in the newLineSet

Edit: (Adding example)

- (void)textViewDidChange:(UITextView *)textView {
	NSString *trimmedValue = [textView.text stringByTrimmingCharactersInSet:[NSCharacterSet newLineCharacterSet]];
	NSRange newLineRange = [trimmedValue rangeOfCharacterFromSet:[NSCharacterSet newlineCharacterSet]];
	
	if (newLineRange.length > 0) {
		self.navigationItem.title = [trimmedValue substringToIndex:newLineRange.location];
	} else {
		self.navigationItem.title = textView.text;
	}
}

[franium]

Originally Posted by JoeBlaze

Trim characters in the newLineSet

Edit: (Adding example)

- (void)textViewDidChange:(UITextView *)textView {
	NSString *trimmedValue = [textView.text stringByTrimmingCharactersInSet:[NSCharacterSet newLineCharacterSet]];
	NSRange newLineRange = [trimmedValue rangeOfCharacterFromSet:[NSCharacterSet newlineCharacterSet]];
	
	if (newLineRange.length > 0) {
		self.navigationItem.title = [trimmedValue substringToIndex:newLineRange.location];
	} else {
		self.navigationItem.title = textView.text;
	}
}

you're great... thank you very much