在UIPopover中显示UIDatePicker

Question

我使用以下代码来显示一个UIDatePicker内的UIPopover当用户点击一个被显示UIButton.

问题是,它显示在一个尴尬的位置,我想在有额外空间UIToolBar的datePicker地方上方添加一个.这将有cancel和done按钮.我怎么能做到这一点？显示它的按钮就是那个Date of Birth.

- (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

有没有理由你不能只使用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视图中.确保正确调整大小并实现done和cancel选择器.