使用 xcode 模拟器 IOS 5 测试 ipad 2 摄像头

Question

我正在使用 ipad 模拟器测试 ipad 相机应用程序 我使用下面的代码，更改源类型而不是相机。

  -(IBAction)useCamera:(id)sender{


    if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]){

    UIImagePickerController *imagePicker = 
    [[UIImagePickerController alloc] init];
    imagePicker.delegate =(id<UINavigationControllerDelegate,UIImagePickerControllerDelegate>) self;
    imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    imagePicker.mediaTypes = [NSArray arrayWithObjects:(NSString *) kUTTypeImage,nil];
    imagePicker.allowsEditing = NO;
    [self presentModalViewController:imagePicker animated:YES];

    [imagePicker release];
    newMedia = YES;

    }

}

当它在模拟器中运行时，在 ios 5 模拟器中出现错误。

   Terminating app due to uncaught exception 'NSInvalidArgumentException', reason:'On iPad,     UIImagePickerController must be presented via UIPopoverController' 

但它在 4.3 模拟器上工作

Answer 1

从 iOS5 开始，您需要在弹出视图而不是模态视图中显示选择器控制器。

来自苹果文档：在 iPad 上，使用弹出框呈现用户界面。仅当图像选择器控制器的 sourceType 属性设置为 UIImagePickerControllerSourceTypeCamera 时，这样做才有效。要使用 popover 控制器，请使用 UIPopoverController 类参考中“Presenting and Dismissing the Popover”中描述的方法。

http://developer.apple.com/library/ios/#documentation/uikit/reference/UIImagePickerController_Class/UIImagePickerController/UIImagePickerController.html

这是在弹出视图中显示 UIImagePickerController 的示例：

UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
imagePicker.delegate = self;
imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
popover = [[UIPopoverController alloc] initWithContentViewController:imagePicker];
[popover presentPopoverFromRect:CGRectMake(0.0, 0.0, 400.0, 400.0) 
                     inView:self.view
                     permittedArrowDirections:UIPopoverArrowDirectionAny 
                     animated:YES];