UIPopOver 中如何提供按钮选择？

Question

- (IBAction)openImagePicker:(id)sender //Makes UIImagePicker roll up from the bottom.
{
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
    {
        // We are using an iPhone
        UIActionSheet *alertSheet = [[UIActionSheet alloc] initWithTitle:@"Where do you want to get your daily image?" delegate:(self) cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:@"Camera", @"Library", nil];
        [alertSheet setTag:0];
        [alertSheet setDelegate:self];
        [alertSheet showFromTabBar:[[self tabBarController] tabBar]];
        [alertSheet release];
    }
    else
    {
        // We are using an iPad
        UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
        imagePickerController.delegate = self;
        UIPopoverController *popoverController=[[UIPopoverController alloc] initWithContentViewController:imagePickerController];
        popoverController.delegate=self;
        [popoverController presentPopoverFromRect:((UIButton *)sender).bounds inView:sender permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
    }
}

因此，在 iPad 部分，我希望它能够让你在拍摄新照片和使用已有照片之间做出选择，就像在 iPhone 上一样。现在它可以让你选择你已经拿过的一个。

Answer 1

UIActionSheet 有一个名为 showFromBarButtonItem:animated: 的方法。如果您指定栏按钮项目，则操作表将显示在 iPad 上的弹出窗口中。