This makes editing the textview fill up the entire screen

textView.m

//
//  ViewController.m
//  erica-Sadun-textViewExample
//
//  Created by Romy Ilano on 1/3/13.
//  Copyright (c) 2013 Romy Ilano. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.
    
    // add the notification
    // I'm going to listen for when the keyboard "did show" and "will hide"
    // offers opportune times to react to the keyboard arriving onscreen or preparing to leave
    
    // each notification provides a userInfo dictionary that supplies the bounds for the keyboard, using the UIKeyboardBoundsUserInfoKey
    // no objects are passed around with the notification. you are not granted direct access to the keyboard itself
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillHide:)
                                                 name:UIKeyboardWillHideNotification
                                               object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(adjustForKeyboard:)
                                                 name:UIKeyboardDidShowNotification
                                               object:nil];
    
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark-TextViewMethods
CGRect CGRectShrinkHeight(CGRect rect, CGFloat amount)
{
    return CGRectMake(rect.origin.x, rect.origin.y, rect.size.width, rect.size.height-amount);

}

-(void)keyboardWillHide:(NSNotification *)notification
{
    // return to the previous text view size
    self.tv.frame=self.view.bounds;
}

// see that notification? it comes baked with a userInfo dictionary that i retrieve [notification userInfo]
-(void)adjustForKeyboard:(NSNotification *)notification
{
    // retrive the keyboard bounds via the notification userInfo dictionary
    //  this lets me resize the views to adapt them to the keyboard's presence
    
    CGRect kbounds;
    NSDictionary *userInfo = [notification userInfo];
    
    // standard keyboards always appear on the bottom of the screen... generally when a text-capable view becomes the first responder, custom keyboards are not limited to that style of presentation
    [(NSValue *)[userInfo objectForKey:@"UIKeyboardBoundsUserInfoKey"] getValue:&kbounds];
    
    // shrink the textview frame
    CGRect destRect = CGRectShrinkHeight(self.view.bounds, kbounds.size.height);
    self.tv.frame=destRect;
}


@end