我們知道，在iPhone中獲取照片庫常用的方法如下：

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UIImagePickerController *m_imagePicker = [[UIImagePickerController alloc] init];
??? if ([UIImagePickerController isSourceTypeAvailable:
??? ??? ?UIImagePickerControllerSourceTypePhotoLibrary]) {
??? ??? m_imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
??? ??? m_imagePicker.delegate = self;
??? ??? //??? ??? [m_imagePicker.navigationBar.subviews];
??? ??? [m_imagePicker setAllowsEditing:NO];
??? ??? //m_imagePicker.allowsImageEditing = NO;
??? ??? [self presentModalViewController:m_imagePicker animated:YES];
??? ??? [m_imagePicker release];
??? }else {
??? ??? UIAlertView *alert = [[UIAlertView alloc]initWithTitle:nil message:@"Error accessing photo library!" delegate:nil cancelButtonTitle:@"Close" otherButtonTitles:nil];
??? ??? [alert show];
??? ??? [alert release];
??? }

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這對iPhone的操作是沒有問題的。但是當我們在iPad環境中卻有問題了，當我們運行時會報如下錯誤：

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

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所以我們必須通過UIPopoverController來實現才行。具體實現如下：

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UIImagePickerController *m_imagePicker = [[UIImagePickerController alloc] init];
??? if ([UIImagePickerController isSourceTypeAvailable:
??? ??? ?UIImagePickerControllerSourceTypePhotoLibrary]) {
??? ??? m_imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
??? ??? m_imagePicker.delegate = self;
??? ??? [m_imagePicker setAllowsEditing:NO];
??? ??? UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:m_imagePicker];
??? ??? self.popoverController = popover;
??? ??? //popoverController.delegate = self;
??? ????
??? ??? [popoverController presentPopoverFromRect:CGRectMake(0, 0, 300, 300) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
??? ????
??? ??? //[self presentModalViewController:m_imagePicker animated:YES];
??? ??? [popover release];
??? ??? [m_imagePicker release];
??? }else {
??? ??? UIAlertView *alert = [[UIAlertView alloc]initWithTitle:nil message:@"Error accessing photo library!" delegate:nil cancelButtonTitle:@"Close" otherButtonTitles:nil];
??? ??? [alert show];
??? ??? [alert release];
??? }
這里需要注意，對局部UIPopoverController對象popover我們賦給了一個全局的UIPopoverController對象popoverController。而不能直接調用popover。因為在popover對象還可見時，是不能夠被釋放的。

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from:http://blog.csdn.net/fxj281314/article/details/6050588?

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