Adjust content insets of a tableview when keyboard opens.

KeyboardNotification.m

- (void)viewDidLoad
{
    [super viewDidLoad];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillShow:)
                                                 name:UIKeyboardWillShowNotification
                                               object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillHide:)
                                                 name:UIKeyboardWillHideNotification
                                               object:nil];
}

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

- (void)keyboardWillShow:(NSNotification *)notification
{    
    CGSize keyboardSize = [notification.userInfo[UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
    NSNumber *rate = notification.userInfo[UIKeyboardAnimationDurationUserInfoKey];
    
    UIEdgeInsets contentInsets;
    if (UIInterfaceOrientationIsPortrait([[UIApplication sharedApplication] statusBarOrientation])) {
        contentInsets = UIEdgeInsetsMake(0.0, 0.0, (keyboardSize.height), 0.0);
    } else {
        contentInsets = UIEdgeInsetsMake(0.0, 0.0, (keyboardSize.width), 0.0);
    }
    
    [UIView animateWithDuration:rate.floatValue animations:^{
        self.tableView.contentInset = contentInsets;
        self.tableView.scrollIndicatorInsets = contentInsets;
    }];
    [self.tableView scrollToRowAtIndexPath:self.editingIndexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];
}

- (void)keyboardWillHide:(NSNotification *)notification
{
    NSNumber *rate = notification.userInfo[UIKeyboardAnimationDurationUserInfoKey];
    [UIView animateWithDuration:rate.floatValue animations:^{
        self.tableView.contentInset = UIEdgeInsetsZero;
        self.tableView.scrollIndicatorInsets = UIEdgeInsetsZero;
    }];
}

what is self.editingIndexPath?

self.editingIndexPath? ???

It wasn't explained, but through trial and error I figured out self.editingIndexPath = last row in the tableview.

Helpful but more helpful it self.editingIndexPath was explained.

For those wondering, self.editingIndexPath is the NSIndexPath of the UITableViewCell containing the view that presented the keyboard.

For example, suppose you have a UITableViewCell containing a UITextField, and your viewController is the textField's delegate. You could use the UITextFieldDelegate methods to obtain the index path like this:

- (void)textFieldDidBeginEditing:(UITextField *)textField {
    // Call superView twice to account for the contentView. If the text field isn't a direct subview of the
    // contentView, you'll have to work your way up
    if [textField.superView.superView isKindOfClass:[MyCustomTableViewCell class]] {
        self.editingIndexPath = [self.tableView indexPathForCell: textField.superView.superView];
    }
}

- (void)textFieldDidEndEditing:(UITextField *)textField {
    self.editingIndexPath = nil;
}

It doesn't have to be a UITextField becoming the firstResponder that triggers the keyboard, this is just one example to help explain the self.editingIndexPath property.

hmm, i had to change keyboardWillShow to the following:

- (void)keyboardWillShow:(NSNotification *)notification
{
	CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
	UIEdgeInsets contentInsets;
	contentInsets = UIEdgeInsetsMake(0.0, 0.0, (keyboardSize.height), 0.0);
	self.tableView.contentInset = contentInsets;
	self.tableView.scrollIndicatorInsets = contentInsets;
	[self.tableView scrollToRowAtIndexPath: editingIndexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];
}

else the inset was to large in landscape mode.

concerning editIndexPath:
i added

@interface MyTableViewController ()
{
	NSIndexPath* editingIndexPath;
}
@end

to the top of my viewcontroller.

Then i set the indexPath when i call my textedit method.

Should be UIKeyboardFrameEndUserInfoKey. In iOS11, the height is 0 when you use UIKeyboardFrameBeginUserInfoKey! Also, on iPhoneX the height is 75 pts more in portrait mode. So, you are better off adjusting a constraint of the tableview that is pinned to the bottom of the superview because the keyboard is pinned to the bottom of the superview too. Then you don't need to change the tableview contentInset at all. This works on all devices.