UILabel text property returns null

[architectpianist]

Hi,
I'm trying to change a UILabel's text on the event touchesEnded.
Here's my code:

- (void) setInstructions:(NSString *)text
{
	[instructions performSelectorOnMainThread:@selector(setText:) withObject:text waitUntilDone:YES];
}
...
- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
	NSLog(@"Touches ended");
	
	UITouch *touch = [touches anyObject];
	touchPoint = [touch locationInView:self];
	originalPoint = touchPoint;
	[self setInstructions:@"Next step reached."];
	drawingState++;
	fprintf(stderr, "%s", instructions.text);
	
	[location removeFromSuperview];
	location = nil;
}

A previous call to setInstructions: (from initWithFrame:) returns the correct display text, but when I call it from touchesEnded, it doesn't do anything to the UILabel. The log says:

2011-02-20 20:00:24.823 MyProject[62997:207] Touches ended
(null)

Why is the instructions' text property returning null? And how can I update the UILabel's text?
Thanks!

[smasher]

Because label.text is not c string, so %s will not print it.

Try this instead:

NSLog(@"label is:%@ text is: %@", instructions, instructions.text);

Also, I doubt the performSelectorOnMainThread is required. UIKit only calls touchesEnded:withEvent: on the main thread so we're already there, right?

[architectpianist]

Following what smasher said, and I got:

2011-02-20 21:38:26.640 Trying[63792:207] Label is: (null) text is: (null)

Thanks anyway, but who knows what's wrong with this?

[baja_yu]

What the output from smahser's NSLog tells you is that your label doesn't exist, that is the pointer points to nothing.

[smasher]

Yep, it looks like you forgot to hook up that outlet in interface builder, or failed to point that pointer at a valid label.