iOS：更改设备方向时发送到实例的无法识别的选择器

Question

我试图在iPad的屏幕中间显示一个小控制器。

-(void)showDownloadDialog {


if (self.downloadDialogViewController == nil)
{
    self.downloadDialogViewController = [[DownloadDialogViewController alloc] initWithNibName:@"DownloadDialogViewController" bundle:nil];
}

self.downloadDialogViewController.view.center = CGPointMake(SCREEN_WIDTH/2, SCREEN_HEIGHT/2);

if(LTIsPhone()) {

    [self presentViewController:_downloadDialogViewController animated:NO completion:nil];
    return;
}

if(_darkBackgroundView == nil)
{
    _darkBackgroundView = [[UIView alloc] init];
    _darkBackgroundView.backgroundColor = [UIColor colorWithWhite:0.1 alpha:0.5];
}

_darkBackgroundView.frame = CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
self.downloadDialogViewController.view.center = CGPointMake(SCREEN_WIDTH/2, SCREEN_HEIGHT/2);
UIWindow *window = [[UIApplication sharedApplication] keyWindow];
[window addSubview:_darkBackgroundView];
[window addSubview:self.downloadDialogViewController.view];}

它确实出现了，但在我翻转iPad并尝试在屏幕上推动任何控件之后，发生了无法识别的选择器错误。我的IBActions无法找到。

-[__NSArrayM lowResButtonDidFire:]: unrecognized selector sent to instance 0x18a95770

当我presentViewController一切正常时，但当我处理视图中添加的控制器时，就会发生崩溃。怎么解决？先感谢您。