Objective c 如何使用UIPopOverController使使用ImagePicker的iPhone应用程序在iPhone上工作？

我正在制作一个通用应用程序，它在iPhone上运行得非常好！但在iPad上，它无法启动图像选择器。代码是：

- (IBAction)openImagePicker:(id)sender //Makes UIImagePicker roll up from the bottom.
{
    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];
}

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它说原因是“*由于未捕获的异常‘NSInvalidArgumentException’而终止应用程序，原因是：‘在iPad上，UIImagePickerController必须通过UIPopoverController呈现’”。我该怎么做？谢谢您的帮助。

您必须检查应用程序安装在哪种类型的设备上，然后适当地显示控制器。您可以按照以下方式进行操作：

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];
}

不要忘记实现UIPopoverController委托方法

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祝你好运

你需要检查iPad的代码并显示一个popover，否则只需显示图像控制器即可。