iPad上调用UIImagePickerViewController，与iPhone调用略有不同。
-(void) pickImage{ 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 presentPopoverFromRect:CGRectMake(0, 0, 300, 300) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny 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]; }}