可以通过滑动来取消模态视图

Question

我在呈现模态视图时遇到了一种奇怪的行为。我有一个滚动视图作为我的主视图有4页...点击滚动视图上的按钮显示模态视图，但我可以通过向左或向右滑动来关闭模态视图。显然我只是希望能够使用完成按钮来解雇。

这是我用来显示模态视图的方法：

- (void)popUpModal:(id)sender {

UIViewController *detailView = [[UIViewController alloc] initWithNibName:@"KeyboardView" bundle:nil];
detailView.view.backgroundColor = [UIColor blackColor];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:detailView];

UIBarButtonItem * doneButton =
[[UIBarButtonItem alloc]
 initWithBarButtonSystemItem:UIBarButtonSystemItemDone
 target:self action:@selector(doneAction) ];

detailView.navigationItem.rightBarButtonItem = doneButton;

[doneButton release];


UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)];

NSString *url = @"http://www.google.com";

[webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:url]]];


[detailView.view addSubview:webView];

[self presentModalViewController:navController animated:YES];

[detailView release];

[navController release];

}

什么会导致这种行为？

感谢。