Aparezco un DatePicker con lo siguiente. Ahora estoy tratando de agregar un botón Listo en la parte superior del marco emergente.

-(IBAction) contactBDayDatePicker{

NSLog(@"contactBDayDatePicker");

pickerView = [[UIDatePicker alloc] init];
pickerView.datePickerMode = UIDatePickerModeDate;

if (self.pickerView.superview == nil){

    [self.view.window addSubview: self.pickerView];

    // size up the picker view to our screen and compute the start/end frame origin for our slide up animation
    //
    // compute the start frame
    CGRect screenRect = [[UIScreen mainScreen] applicationFrame];

    NSLog(@"screenRect %@",NSStringFromCGRect(screenRect));

    CGSize pickerSize = [self.pickerView sizeThatFits:CGSizeZero];

    NSLog(@"pickerSize %@",NSStringFromCGSize(pickerSize));

    CGRect startRect = CGRectMake(0.0,
                                  screenRect.origin.y + screenRect.size.height,
                                  pickerSize.width, pickerSize.height);
    self.pickerView.frame = startRect;

    NSLog(@"pickerView.frame %@",NSStringFromCGRect(startRect));

    // compute the end frame
    CGRect pickerRect = CGRectMake(0.0,
                                   screenRect.origin.y + screenRect.size.height - pickerSize.height,
                                   pickerSize.width,
                                   pickerSize.height+10);

    NSLog(@"pickerRect %@",NSStringFromCGRect(pickerRect));

    // start the slide up animation
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.3];

    // we need to perform some post operations after the animation is complete
    [UIView setAnimationDelegate:self];

    self.pickerView.frame = pickerRect;

    [UIView commitAnimations];

}

 } 

He intentado aumentar el tamaño del marco en 10 puntos (ver CGSize pickerSize arriba) y pensé que podría usar algo como lo siguiente, pero el botón se niega a mostrarse, además no estoy seguro de cómo colocar el botón dentro del marco del selector. . (Por cierto) DatePicker y Button están superponiendo un scrollView si eso es importante.

  UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
  [button setTitle:@"Done" forState:UIControlStateNormal];
  button.center = CGPointMake(160,240);
  [button addTarget:self action:@selector(done)    forControlEvents:(UIControlEventTouchUpInside)];
  [self.view addSubview:button];

Cualquier pensamiento es apreciado.