Center UIButton programmatically - objective-c

Question

I have a UIButton which i add programmatically. No problems here, it stetches as it should and looks good.
However, when I tilt the phone to landscape the button gets out of place, and I want it still centered.
Portrait:
Landscape:
I have tried a bunch of thing but cannot seem to get it working, it seems to me that the autoresizing should take care of it, however... it doesn't work in that case.
- (UIView*)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section
{
UIView *footerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.tableView.frame.size.width, 49)];
_notMeButton = [UIButton buttonWithType:UIButtonTypeCustom];
UIImage *butImage = [[UIImage imageNamed:#"notme.png"] stretchableImageWithLeftCapWidth:6 topCapHeight:6];
UIImage *butImagePressed = [[UIImage imageNamed:#"KC_notmePressed.png"] stretchableImageWithLeftCapWidth:6 topCapHeight:6];
[_notMeButton setBackgroundImage:butImage forState:UIControlStateNormal];
[_notMeButton setBackgroundImage:butImagePressed forState:UIControlStateHighlighted];
[_notMeButton setTitle:NSLocalizedString(#"Change address", #"KlarnaCheckout") forState:UIControlStateNormal];
[_notMeButton setTitleColor:[UIColor darkGrayColor] forState:UIControlStateNormal];
[_notMeButton setTitleColor:[UIColor blackColor] forState:UIControlStateHighlighted];
[_notMeButton setTitleShadowColor:[UIColor whiteColor] forState:UIControlStateNormal];
[_notMeButton.titleLabel setShadowColor:[UIColor whiteColor]];
[_notMeButton.titleLabel setShadowOffset:CGSizeMake(0, 1)];
[_notMeButton.titleLabel setFont:[UIFont systemFontOfSize:14]];
[_notMeButton addTarget:self action:#selector(thisIsNotMe) forControlEvents:UIControlEventTouchUpInside];
[_notMeButton setTag:1];
[_notMeButton sizeToFit];
[_notMeButton setAutoresizingMask:UIViewAutoresizingFlexibleLeftMargin];
[_notMeButton setAutoresizingMask:UIViewAutoresizingFlexibleRightMargin];
[_notMeButton setFrame:CGRectMake(10, 10, _notMeButton.frame.size.width+20, _notMeButton.frame.size.height)];
[_notMeButton setCenter:footerView.center];
[footerView addSubview:_notMeButton];
return footerView;
}

Answer 1

Your idea about autoresizing mask is right, but you're setting it incorrectly:
[_notMeButton setAutoresizingMask:UIViewAutoresizingFlexibleLeftMargin];
[_notMeButton setAutoresizingMask:UIViewAutoresizingFlexibleRightMargin];
The second line overwrites what you set in the 1st. Correct way to set several flags will be:
[_notMeButton setAutoresizingMask:UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin];

Answer 2

One thing before I answer your question:
[_notMeButton setAutoresizingMask:UIViewAutoresizingFlexibleLeftMargin];
[_notMeButton setAutoresizingMask:UIViewAutoresizingFlexibleRightMargin];
The second sentence overwrites the first one, you should use the | operator so both resizing mask are applied:
[_notMeButton setAutoresizingMask:UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin];
To keep the element where it is when the view changes its size, you need to tell it not to use any resizing mask:
[_notMeButton setAutoresizingMask:UIViewAutoresizingNone];
And the equivalent in Interface Builder is this:
I hope it helps