Question

I would like to make an extra button in the iPhone keyboard left bottom corner like on the photo bellow. Is it possible to do this ?

Answer 1

the only way to customize those buttons is to rebuild the keyboard itself.

http://www.raywenderlich.com/1063/ipad-for-iphone-developers-101-custom-input-view-tutorial

Ray has always got some good tutorials on iphone dev. being able to customize your inputView is only half the battle tho. You will then need to build the custom view. Likely you will want to emulate the existing keypad, with your custom button obviously.

as a side note. to dismiss the keyboard you need to resignFirstResponder via the first responder.

When you get that far, here is the code I use to do exactly that

@implementation UIView (FindAndResignFirstResponder)
- (BOOL)findAndResignFirstResponder
{
    UIView *responder = [self findFirstResponder];
    if (responder) {
        [responder resignFirstResponder];
        return YES;     
    }
    return NO;
}
- (UIView*)findFirstResponder
{
    if (self.isFirstResponder) {
        return self;     
    }
    for (UIView *subView in self.subviews) {
        UIView *responder = [subView findFirstResponder];
        if (responder != nil)
            return responder;
    }
    return nil;
}
@end

call the if you have a hold of the superview of all your inputs, you can call findAndResignFirstResponder on that view.

Or as you can see the findAndResignFirstResponder calls resignFirstResponder on the “found” firstResponder. therefore if you have the first responder you can just resign it