Ipad 仅当使用设备时，iOS copyWithZone选择器无法识别

我正在开发一款iPad应用程序，它只在sqlite DB中有特定数据时才会启动初始屏幕，如下所示：

if ((int)[MyStore sharedInstance].mode < 0) 
{
    self.connectionSettingsViewController = [[[ConnectionSettingsViewController alloc] initWithNibName:@"ConnectionSettingsModalViewController" bundle:nil] autorelease];
    self.connectionSettingsViewController.view.transform = CGAffineTransformMakeRotation(M_PI_2); 
    self.connectionSettingsViewController.delegate = self;
    self.launchScreen = [[[UIView alloc] initWithFrame:CGRectMake(-256, 0, 1024, 768)] autorelease];
    [self.launchScreen addSubview:self.connectionSettingsViewController.view];
    [self.window addSubview:self.launchScreen];
}

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UIViewController未实现NSCopying协议。除非您在自己的UIViewController子类中实现了NSCopying，否则视图控制器不会响应

-copyWithZone:

UIViewController不实现NSCopying协议。除非您在自己的UIViewController子类中实现了NSCopying，否则视图控制器将不会响应

-copyWithZone:

[someViewController copyWithZone:] unrecognized selector sent to instance.