我需要知道如何在 iPhone SDK 中打开图库。我相信我的代码是正确的，但我仍然遇到异常。
这是我的代码：
-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{
imgpkrController.delegate = self;
imgpkrController.allowsEditing = YES;
imgpkrController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
//[self presentModalViewController:(UIViewController *)imgpkrController animated:YES];
[self presentViewController:(UIViewController *)imgpkrController animated:YES completion:nil];}
通过使用此代码，我得到了异常：
UIApplicationInvalidInterfaceOrientation', reason:
preferredInterfaceOrientationForPresentation must return a supported interface orientation!
所以我尝试了这段代码：
-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{
UIInterfaceOrientation interface = [[UIApplication sharedApplication] statusBarOrientation];
if(interface == UIDeviceOrientationPortrait)
{
imgpkrController.delegate = self;
imgpkrController.allowsEditing = YES;
imgpkrController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
//[self presentModalViewController:(UIViewController *)imgpkrController animated:YES];
[self presentViewController:(UIViewController *)imgpkrController animated:YES completion:nil];
}else if (interface ==UIDeviceOrientationLandscapeLeft || interface ==UIDeviceOrientationLandscapeRight)
{
imgpkrController.delegate = self;
imgpkrController.allowsEditing = YES;
imgpkrController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
//[self presentModalViewController:(UIViewController *)imgpkrController animated:YES];
[self presentViewController:(UIViewController *)imgpkrController animated:YES completion:nil];}}
但这给出了同样的例外。有人可以帮我解决这个问题吗？