单击tablecell显示UIDatePicker

Question

我有一个tableview控制器，其中一个单元格是"date“，当我单击时，我想显示一个datepicker并更新值。

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当我点击limit date时，我会看到

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下面是代码：

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if ( indexPath.section == 0 )
    {
        if ( indexPath.row == 3 )
        {
            UITableViewCell *targetCell = [tableView cellForRowAtIndexPath:indexPath];
            self.pickerView.date = [self.dateFormatter dateFromString:targetCell.detailTextLabel.text];

            // check if our date picker is already on screen
            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];
                CGSize pickerSize = [self.pickerView sizeThatFits:CGSizeZero];
                CGRect startRect = CGRectMake(0.0,
                                              screenRect.origin.y + screenRect.size.height,
                                              pickerSize.width, pickerSize.height);
                self.pickerView.frame = startRect;

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

                    // shrink the table vertical size to make room for the date picker
                    CGRect newFrame = self.tableView.frame;
                    newFrame.size.height -= self.pickerView.frame.size.height;
                    self.tableView.frame = newFrame;
                [UIView commitAnimations];

                // add the "Done" button to the nav bar

                self.navigationItem.rightBarButtonItem = self.doneButton;
            }
        }
    }
}


- (IBAction)dateChanged:(id)sender
{
    [self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:3 inSection:0]].detailTextLabel.text = [self.dateFormatter stringFromDate:[sender date]];
}

- (void)slideDownDidStop
{
    [self.pickerView removeFromSuperview];
}

- (IBAction)doneAction:(id)sender
{
    CGRect screenRect = [[UIScreen mainScreen] applicationFrame];
    CGRect endFrame = self.pickerView.frame;
    endFrame.origin.y = screenRect.origin.y + screenRect.size.height;

    // start the slide down 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];
    [UIView setAnimationDidStopSelector:@selector(slideDownDidStop)];

    self.pickerView.frame = endFrame;
    [UIView commitAnimations];

    // grow the table back again in vertical size to make room for the date picker
    CGRect newFrame = self.tableView.frame;
    newFrame.size.height += self.pickerView.frame.size.height;
    self.tableView.frame = newFrame;

    // remove the "Done" button in the nav bar
    self.navigationItem.rightBarButtonItem = nil;

    // deselect the current table row
    NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
    [self.tableView deselectRowAtIndexPath:indexPath animated:YES];

    self.navigationItem.rightBarButtonItem = self.nextButton;
}

我有三个问题：

首先: datepicker顶部的黑条是什么?我如何删除它？

第二:当用户在datepicker外部单击时，如何关闭datepicker？

第三:如何移动表视图滚动条，以便在datepicker打开时"limit date“字段可见？

抱歉截图太大了。

Answer 1

那presenting your date picker modally in UIActionSheet呢？

在上面的例子中，黑条(这可能是一个大小问题)被一个方便的工具栏所取代，在这个工具栏中，你可以放置像“保存”和“取消”这样的按钮，我相信如果你使用一个UIActionSheet并在它外面单击，它会自动消失(我不确定这一点)，但如果‘它不是，你可以使用它的dismiss方法来隐藏它。

关于表格视图，你可以使用[myTableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:someRow inSection:someSection] atScrollPosition:UITableViewScrollPositionMiddle animated:YES];在你想要的特定单元格处设置表格滚动的偏移量。