在 UIPopover 内显示 UIDatePicker

Question

我使用以下代码在用户单击 UIButton 时显示的 UIPopover 中显示 UIDatePicker。

问题是，它显示在一个尴尬的位置，我想在 datePicker 上方添加一个 UIToolBar ，那里有额外的空间。这将有取消和完成按钮。我怎样才能做到这一点？显示它的按钮是出生日期按钮。

- (IBAction)dateOfBirthButtonPressed:(id)sender{
    UIViewController* popoverContent = [[UIViewController alloc] init];

    UIView *popoverView = [[UIView alloc] init];
    popoverView.backgroundColor = [UIColor blackColor];

    UIDatePicker *datePicker=[[UIDatePicker alloc]init];
    datePicker.frame=CGRectMake(0,44,320, 216);
    datePicker.datePickerMode = UIDatePickerModeDateAndTime;
    [datePicker setMinuteInterval:5];
    [datePicker setTag:10];
//    [datePicker addTarget:self action:@selector(dateChanged) forControlEvents:UIControlEventValueChanged];
    [popoverView addSubview:datePicker];

    popoverContent.view = popoverView;
    UIPopoverController *popoverController = [[UIPopoverController alloc] initWithContentViewController:popoverContent];
    popoverController.delegate=self;
    [popoverContent release];

    [popoverController setPopoverContentSize:CGSizeMake(320, 264) animated:NO];
    [popoverController presentPopoverFromRect:self.dateOfBirthButton.frame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
}

Answer 1

您是否有理由不能只使用 UIToolbar？

UIToolbar* toolbar = [[UIToolbar alloc] initWithFrame: CGRectMake(0.0, 0.0, 320.0, 44.0)];
UIBarButtonItem* cancelButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemCancel
                                                                              target: self
                                                                              action: @selector(cancel)];
UIBarButtonItem* space = [[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemFlexibleSpace
                                                                       target: nil
                                                                       action: nil];
UIBarButtonItem* doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemDone
                                                                            target: self
                                                                            action: @selector(done)];

NSMutableArray* toolbarItems = [NSMutableArray array];
[toolbarItems addObject:cancelButton];
[toolbarItems addObject:space];
[toolbarItems addObject:doneButton];
[cancelButton release];
[doneButton release];
[space release];
toolbar.items = toolbarItems;

然后只需将工具栏添加到您的视图中即可。确保其大小正确并实现 done 和 cancel 选择器。

Answer 2

[popoverController presentPopoverFromRect:self.dateOfBirthButton.frame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

使用 sender 代替 self.view

[popoverController presentPopoverFromRect:((UIButton *)sender).bounds inView:sender permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];