我正在开发一个 iPad 应用程序,仅当 sqlite 数据库中有某些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];
}
该代码位于应用程序委托中。我面临的问题是,这在 iOS 模拟器中运行良好,但当我尝试在 iPad 上运行时,出现以下错误:
[someViewController copyWithZone:] unrecognized selector sent to instance.
UIViewController 不实现 NSCopying 协议。除非你在自己的 UIViewController 子类中实现了 NSCopying,否则你的视图控制器不会响应-copyWithZone:
.
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