单元的子视图不适合UITableView的框架

Question

当我点击UITableViewCell时，我正试图这样做，其下面的子视图带有UIDatePicker。框架没有调整大小，我不知道如何做到这一点。这是一张照片，你必须向下拖动才能看到UIDatePicker（在时间模式下设置）。

    CGRect frame = CGRectMake(0, cell.bounds.size.height, self.view.bounds.size.width, 100);
    UIDatePicker *pickerView = [[UIDatePicker alloc] initWithFrame:frame];  // which should be 'now' right?
    pickerView.datePickerMode = UIDatePickerModeTime;  // which creates just the clock
    [pickerView setDate:[NSDate date]];
    //[pickerView addTarget:self action:@selector(updateTextField:) forControlEvents:UIControlEventValueChanged];
    pickerView.clipsToBounds = YES;

    [pickerView setValue:[UIColor whiteColor] forKey:@"textColor"];

    [cell addSubview:pickerView];
    [self.firstTable sizeToFit];