How to use add pinch-to-zoom to a TextView

TextViewPinchToZoom

// Create a pinch gesture recognizer instance.
self.pinchGestureRecognizer = [[[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchGesture:)] autorelease];

// And add it to your text view.
[self.myTextView addGestureRecognizer:self.pinchGestureRecognizer];

// ... 

- (void)pinchGesture:(UIPinchGestureRecognizer *)gestureRecognizer
{
	NSLog(@"*** Pinch: Scale: %f Velocity: %f", gestureRecognizer.scale, gestureRecognizer.velocity);

	UIFont *font = self.myTextView.font;
	CGFloat pointSize = font.pointSize;
	NSString *fontName = font.fontName;

	pointSize = ((gestureRecognizer.velocity > 0) ? 1 : -1) * 1 + pointSize;
	
	if (pointSize < 13) pointSize = 13;
	if (pointSize > 42) pointSize = 42; 
	
	self.myTextView.font = [UIFont fontWithName:fontName size:pointSize];
	
	// Save the new font size in the user defaults.
        // (UserDefaults is my own wrapper around NSUserDefaults.)
	[[UserDefaults sharedUserDefaults] setFontSize:pointSize];
}