IPad keyboard will not dismiss with hide keyboard button

Question

I have a UITextField on my screen. The keyboard will not disappear when I press the hide keyboard button in the lower right corner. Pressing the "Done" button works just fine and the keyboard will disappear.
I have connected the textbox's delegate to Files Owner. Verified by looking at the Text Box's Connection Inspector.
Under Outlets for the textbox "delegate-Files Owner"
My H file contains  @interface SettingsView : UIViewController <UITextFieldDelegate, UITableViewDelegate, UITableViewDataSource>{
In my M file I have the following code.
-(BOOL) textFieldShouldReturn:(UITextField*) textField {
    [textField resignFirstResponder];
    return YES;
When I press the keyboard hide button(lower right corner), the keyboard buttons will sometimes become unresponsive for about 1 second, but the keyboard will not disappear. I would appreciate any guidance with solving this problem. I find it troubling that this key is not working. My efforts to find a solution have come up nil and there appears to be little to no documentation anywhere regarding this lower right corner button.
Thanks in advance.

Answer 1

Thanks for the quick reply. Unfortunately nothing worked. Below is the extra code added in my M file
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField
    [textField resignFirstResponder];
    return YES;
I placed a breakpoint in both the textFiledShouldEndEditing and textFieldShouldReturn. In both cases neither function was called when I pressed the hide keyboard button. They were only called when I pressed the Done button. After a little more research I have found people with the exact same problem, yet no solutions available.
What gets called when the user presses the hide keyboard button? Is this hide keybaord button new?
My only assumption is that somehow the code behind the keyboard has a bug in it that I'm experiencing. I have a few older iPad projects that I decided to try out and run. Each have a UITextEdit field and every one encounter the same problem with the hide keyboard button.