/*

     File: ViewController.m

 Abstract: View controller that adds a keyboard accessory to a text view.

  Version: 1.3

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 */

#import "ViewController.h"

@implementation ViewController

@synthesize textView, accessoryView;

#pragma mark -

#pragma mark View lifecycle

- (void)viewDidLoad {

    [super viewDidLoad];

    // Observe keyboard hide and show notifications to resize the text view appropriately.

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];

}

- (void)viewDidUnload {

    [super viewDidUnload];

    self.textView = nil;

    self.accessoryView = nil;

    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil];

    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil];

}

- (void)viewWillAppear:(BOOL)animated {

    // Make the keyboard appear when the application launches.

    [super viewWillAppear:animated];

    [textView becomeFirstResponder];

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {

    return YES;

}

#pragma mark -

#pragma mark Text view delegate methods

- (BOOL)textViewShouldBeginEditing:(UITextView *)aTextView {

    /*

     You can create the accessory view programmatically (in code), in the same nib file as the view controller's main view, or from a separate nib file. This example illustrates the latter; it means the accessory view is loaded lazily -- only if it is required.

     */

    if (textView.inputAccessoryView == nil) {

        [[NSBundle mainBundle] loadNibNamed:@"AccessoryView" owner:self options:nil];

        // Loading the AccessoryView nib file sets the accessoryView outlet.

        textView.inputAccessoryView = accessoryView;    

        // After setting the accessory view for the text view, we no longer need a reference to the accessory view.

        self.accessoryView = nil;

    }

    return YES;

}

- (BOOL)textViewShouldEndEditing:(UITextView *)aTextView {

    [aTextView resignFirstResponder];

    return YES;

}

#pragma mark -

#pragma mark Responding to keyboard events

- (void)keyboardWillShow:(NSNotification *)notification {

    /*

     Reduce the size of the text view so that it's not obscured by the keyboard.

     Animate the resize so that it's in sync with the appearance of the keyboard.

     */

    NSDictionary *userInfo = [notification userInfo];

    // Get the origin of the keyboard when it's displayed.

    NSValue* aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];

    // Get the top of the keyboard as the y coordinate of its origin in self's view's coordinate system. The bottom of the text view's frame should align with the top of the keyboard's final position.

    CGRect keyboardRect = [aValue CGRectValue];

    keyboardRect = [self.view convertRect:keyboardRect fromView:nil];

    CGFloat keyboardTop = keyboardRect.origin.y;

    CGRect newTextViewFrame = self.view.bounds;

    newTextViewFrame.size.height = keyboardTop - self.view.bounds.origin.y;

    // Get the duration of the animation.

    NSValue *animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];

    NSTimeInterval animationDuration;

    [animationDurationValue getValue:&animationDuration];

    // Animate the resize of the text view's frame in sync with the keyboard's appearance.

    [UIView beginAnimations:nil context:NULL];

    [UIView setAnimationDuration:animationDuration];

    textView.frame = newTextViewFrame;

    [UIView commitAnimations];

}

- (void)keyboardWillHide:(NSNotification *)notification {

    NSDictionary* userInfo = [notification userInfo];

    /*

     Restore the size of the text view (fill self's view).

     Animate the resize so that it's in sync with the disappearance of the keyboard.

     */

    NSValue *animationDurationValue = [userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];

    NSTimeInterval animationDuration;

    [animationDurationValue getValue:&animationDuration];

    [UIView beginAnimations:nil context:NULL];

    [UIView setAnimationDuration:animationDuration];

    textView.frame = self.view.bounds;

    [UIView commitAnimations];

}

#pragma mark -

#pragma mark Accessory view action

- (IBAction)tappedMe:(id)sender {

    // When the accessory view button is tapped, add a suitable string to the text view.

    NSMutableString *text = [textView.text mutableCopy];

    NSRange selectedRange = textView.selectedRange;

    [text replaceCharactersInRange:selectedRange withString:@"You tapped me.\n"];

    textView.text = text;

    [text release];

}

#pragma mark -

#pragma mark Memory management

- (void)dealloc {

    [[NSNotificationCenter defaultCenter] removeObserver:self name:nil object:nil];

    [textView release];

    [super dealloc];

}

@end