应用程序错误尝试以模态方式呈现分割视图控制器

我正在使用故事板，我想加载一组特定的XIB，问题是我得到这个错误：

'NSInvalidArgumentException', reason: 'Application tried to present a Split View Controllers modally <PlaceHolderViewController: 0x38e890> 

在PlaceHolderViewController我有一个button来加载xib这个代码，我没有问题从iPhone加载xib，但在iPad上我有这个问题。

这是代码：

 - (IBAction)actionButtonConversor:(id)sender { ConverterViewController *converterViewController; UnitSelectViewController *unitSelectViewController; if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) { converterViewController = [[ConverterViewController alloc] initWithNibName:@"ConverterViewController_iPhone" bundle:nil]; unitSelectViewController= [[UnitSelectViewController alloc] initWithNibName:@"UnitSelectViewController_iPhone" bundle:nil]; self.navigationController = [[UINavigationController alloc] initWithRootViewController:converterViewController]; self.navigationController.navigationBar.tintColor = [UIColor colorWithRed:0.0f green:0.48235297203063965f blue:0.63137257099151611f alpha:1]; [self presentModalViewController:self.navigationController animated:YES]; } else { converterViewController = [[ConverterViewController alloc] initWithNibName:@"ConverterViewController_iPad" bundle:nil]; unitSelectViewController= [[UnitSelectViewController alloc] initWithNibName:@"UnitSelectViewController_iPad" bundle:nil]; UINavigationController *masterNavigationController = [[UINavigationController alloc] initWithRootViewController:unitSelectViewController]; UINavigationController *detailNavigationController = [[UINavigationController alloc] initWithRootViewController:converterViewController]; masterNavigationController.navigationBar.tintColor = [UIColor colorWithRed:0.0f green:0.48235297203063965f blue:0.63137257099151611f alpha:1]; detailNavigationController.navigationBar.tintColor = [UIColor colorWithRed:0.0f green:0.48235297203063965f blue:0.63137257099151611f alpha:1]; self.splitViewController = [[UISplitViewController alloc] init]; self.splitViewController.delegate = converterViewController; self.splitViewController.viewControllers = [NSArray arrayWithObjects:masterNavigationController, detailNavigationController, nil]; [self presentModalViewController:self.splitViewController animated:YES]; // ERROR comes from here i think } unitSelectViewController.delegate = converterViewController; converterViewController.unitSelectViewController = unitSelectViewController; } 

Answer 1

问题看起来很明显。 以下是从UISplitViewController文档复制的：

“您必须始终将UISplitViewController对象的视图作为应用程序窗口的根视图安装。[…]分割视图控制器不能以模态方式呈现。

换句话说，你看到的是预期的行为。