以编程方式拍照而无需用户交互

如何在没有用户交互或不显示ImagePickerController的情况下拍摄图片

How do I take Picture without User Interaction or without presenting ImagePickerController

  UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];

    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
    {
        [imagePickerController setSourceType:UIImagePickerControllerSourceTypeCamera];
    }

    // image picker needs a delegate,
    [imagePickerController setDelegate:self];

    // Place image picker on the screen
    [self presentModalViewController:imagePickerController animated:YES];

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    [picker dismissModalViewControllerAnimated:YES];
    _myImageView.image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
}

我知道我可以拍照但可以自动完成吗？

I know this way I can take picture but automatically How I do accomplish?