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我用以下方法弹出一个DatePicker.现在我正在尝试在弹出框架的顶部添加一个Done按钮.

-(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 …