相关疑难解决方法(0)

嗨,我正在开发通用应用程序(iPhone/iPad).一个功能是我必须从相册中选择一张照片并在UIImageView上显示.

现在的问题是它在iPhone上运行良好但是当我尝试打开相册时它会崩溃.我在行动表委托中的代码是这样的:

- (void) actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad){
        if ( ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]))

        {   
            if (buttonIndex == 0)
            {
                [self lockAllImagesOnTheScreen];
                imagePicker.sourceType=UIImagePickerControllerSourceTypeCamera;
                [self presentModalViewController:imagePicker animated:YES];
            }
            if (buttonIndex == 1)
            {
                [self lockAllImagesOnTheScreen];

                imagePicker.sourceType= UIImagePickerControllerSourceTypePhotoLibrary;
                [self presentModalViewController:imagePicker animated:YES];
            }

        }
        else {

            if (buttonIndex == 0)
            {
                [self lockAllImagesOnTheScreen];
                imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
                imagePicker.sourceType= UIImagePickerControllerSourceTypePhotoLibrary;
                [self presentModalViewController:imagePicker animated:YES];
            }
        }



    }

    else{
        if ( ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]))

        {   
            if (buttonIndex == 0)
            {
                [self lockAllImagesOnTheScreen];
                imagePicker.sourceType=UIImagePickerControllerSourceTypeCamera;
                [self presentModalViewController:imagePicker animated:YES]; …