iPad 无法加载模态视图

Question

加载模态视图时出现此错误。

*** 由于未捕获的异常“NSUnknownKeyException”而终止应用程序，原因：“[” setValue:forUndefinedKey:]: 这个类与 aboutTableView 键的键值编码不兼容。'

它在 iPhone 上工作得很好，但我在 iPad 上遇到了这个问题。

- (IBAction)showOptionsMenu
{
    self.optionsNavController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
    self.optionsNavController.modalPresentationStyle = UIModalPresentationFormSheet;
    self.optionsNavController.modalInPopover = YES;
    [self presentModalViewController:self.optionsNavController animated:YES];
}

更新：

这有效，但 UIButton 没有显示：

MoreViewController *svc = [[[MoreViewController alloc] init] autorelease];
optionsNavController= [[UINavigationController alloc] initWithRootViewController:svc];
self.optionsNavController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
self.optionsNavController.modalPresentationStyle = UIModalPresentationFormSheet;
self.optionsNavController.modalInPopover = YES;
UIBarButtonItem *doneButton = [[UIBarButtonItem alloc]initWithTitle:@"Done" style:UIBarButtonItemStyleBordered target:self action:@selector(dissmissView)];
self.optionsNavController.navigationItem.rightBarButtonItem = doneButton;
[doneButton release];
[self presentModalViewController:self.optionsNavController animated:YES];

Answer 1

这是为两种设备启动模式视图的好方法：

#define IDIOM   UI_USER_INTERFACE_IDIOM()
#define IPAD    UIUserInterfaceIdiomPad   

SomeViewController *svc = [[[SomeViewController alloc] init] autorelease];
if ( IDIOM == IPAD ) {
    UINavigationController *controller = [[UINavigationController alloc] initWithRootViewController:svc];
    [controller setModalPresentationStyle:UIModalPresentationFormSheet];
    [controller setModalTransitionStyle:UIModalTransitionStyleCoverVertical];
    [self presentModalViewController:controller animated:YES];
    [controller release];
} else {
    /*  or you can present the view as modal:  */
    [self.navigationController pushViewController:svc animated:YES];
}

SomeViewController

-(void)viewDidLoad 
{
    [super viewDidLoad];

    if ( IDIOM == IPAD ) {
        UIBarButtonItem *doneButton = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone
                                                                                     target:self action:@selector(dismiss)] autorelease];
        self.navigationItem.leftBarButtonItem = doneButton;
    }
}
-(void)dismiss
{
    [self dismissModalViewControllerAnimated:YES];
}

Answer 2

您是否为 iphone/ipad 使用不同的 xib？

如果是这样，请检查您的 iPad 版本中的连接，可能存在您尚未删除的处理连接。