Scan line indicator for ZBar overlays

Zbar is a great tool but I often struggle with adding intuitive graphics to the overlay screens in order to clue-in the users to the fact that scanning has already begun in video mode and they just need to point their camera at a barcode. To that end, I've decided that a red colored line dragging up and down on the screen is a great way to get the point across. And the code applies to any scanning framework that lets you mixin an overlay, not just ZBar.

	- (UIView *) loadCameraOverlayView
	{
	NSString *nibName = @"CameraOverlayView";
	NSArray *loadedObjects = [[NSBundle mainBundle] loadNibNamed:nibName owner:nil options:nil];
	UIView *overlayView = [loadedObjects lastObject];
	overlayView.backgroundColor = [UIColor clearColor];
	UIImageView *imageView = (UIImageView*)[overlayView viewWithTag:2];
	UIImage *image = [UIImage imageNamed:"red_neon_line_320x10.png"];
	imageView.image = image;
	[UIView animateWithDuration:1.5
	delay:0.0
	options:(UIViewAnimationOptionRepeat |
	UIViewAnimationOptionAutoreverse |
	UIViewAnimationOptionAllowUserInteraction)
	animations:^{
	imageView.center = CGPointMake(imageView.center.x, imageView.center.y + 280);
	}
	completion:^(BOOL finished){
	}
	];
	//...
	}

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