<pre>

import <UIKit/UIKit.h>

@interface TMVerticallyCenteredTextView : UITextView

@end
</pre>

<pre>

import "TMVerticallyCenteredTextView.h"

@interface TMVerticallyCenteredTextView()
@end
@implementation TMVerticallyCenteredTextView

• (id)initWithFrame:(CGRect)frame
  {
  if (self = [super initWithFrame:frame])
  {
  self.textAlignment = NSTextAlignmentCenter;
  [self addObserver:self forKeyPath:@"contentSize" options: (NSKeyValueObservingOptionNew) context:NULL];
  }
  return self;
  }

• (id)initWithCoder:(NSCoder *)aDecoder
  {
  if (self = [super initWithCoder:aDecoder])
  {
  self.textAlignment = NSTextAlignmentCenter;
  [self addObserver:self forKeyPath:@"contentSize" options: (NSKeyValueObservingOptionNew) context:NULL];
  }
  return self;
  }

-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
if ([keyPath isEqualToString:@"contentSize"])
{
UITextView *tv = object;
CGFloat deadSpace = ([tv bounds].size.height - [tv contentSize].height);
CGFloat inset = MAX(0, deadSpace/2.0);
tv.contentInset = UIEdgeInsetsMake(inset, tv.contentInset.left, inset, tv.contentInset.right);
}
}

• (void)dealloc
  {
  [self removeObserver:self forKeyPath:@"contentSize"];
  }
  </pre>