KeyBoard Handler IOS

KeyboadHandlerIOS

- (void)setupKeyboard
{
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWasShown:)
                                                 name:UIKeyboardWillShowNotification object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillBeHidden:)
                                                 name:UIKeyboardWillHideNotification object:nil];
    
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]
                                   initWithTarget:self
                                   action:@selector(dismissKeyboard)];
    [self addGestureRecognizer:tap];
}

-(void)clean
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

// Called when the UIKeyboardDidShowNotification is sent.
- (void)keyboardWasShown:(NSNotification*)aNotification
{
    NSDictionary* info = [aNotification userInfo];
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size; // keyboard size
    keyBoardHeight = kbSize.height;
    
    CGSize screenSize = [UIScreen mainScreen].bounds.size;
    CGRect frame = [_scrollView convertRect:_scrollView.bounds toView:self.superview];
    
    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height - (screenSize.height - frame.origin.y - frame.size.height), 0.0);
    self.scrollView.contentInset = contentInsets;
    self.scrollView.scrollIndicatorInsets = contentInsets;
    
    [self scrollToSeeTextField];
}

// Called when the UIKeyboardWillHideNotification is sent
- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
    keyBoardHeight = 0;
    UIEdgeInsets contentInsets = UIEdgeInsetsZero;
    self.scrollView.contentInset = contentInsets;
    self.scrollView.scrollIndicatorInsets = contentInsets;
}

-(void)dismissKeyboard
{
    [activeTextField resignFirstResponder];
}

- (IBAction)textFieldEditBegin:(id)sender
{
    activeTextField = sender;
    
    [self scrollToSeeTextField];
}

- (IBAction)textFieldEditEnd:(id)sender
{
    activeTextField = nil;
}

-(void)scrollToSeeTextField
{
    if (keyBoardHeight > 0)
    {
        CGRect aRect = self.bounds;
        aRect.size.height -= keyBoardHeight;
        CGRect frame = [activeTextField convertRect:activeTextField.bounds toView:self];
        if (!CGRectContainsPoint(aRect, frame.origin) )
        {
            frame = [self convertRect:frame toView:self.scrollView];
            [self.scrollView scrollRectToVisible:frame animated:YES];
        }
    }
}