Show&Hide Keyboard

Show&Hide Keyboard

//ViewDidLoad
[[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillShow:)
                                                 name:UIKeyboardWillShowNotification
                                               object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillHide:)
                                                 name:UIKeyboardWillHideNotification
                                               object:nil];
                                               
#pragma mark - UITextField delegate
-(BOOL)textFieldShouldReturn:(UITextField *)textField{
    [textField resignFirstResponder];
    return YES;
}
- (void)keyboardWillShow:(NSNotification*)notification {
    NSDictionary *info = [notification userInfo];
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
    CGRect fr = _scrMain.frame;
    fr.size.height = fr.size.height - kbSize.height;
    _scrMain.frame = fr;
}
- (void)keyboardWillHide:(NSNotification*)notification {
    NSDictionary *info = [notification userInfo];
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
    // Write code to adjust views accordingly using kbSize.height
    CGRect fr = _scrMain.frame;
    fr.size.height = fr.size.height + kbSize.height;
    _scrMain.frame = fr;
}