如何将信息图标添加到导航栏并实现showInfoView方法？

Question

我正在尝试在导航栏顶部添加一个信息按钮。信息按钮将用户引导至信息视图。以下代码将 iPhone 默认信息按钮添加到导航栏。它被放置在 RootViewController.m 的 viewDidLoad 函数中。

UIButton* infoButton = [UIButton buttonWithType:UIButtonTypeInfoLight]; 
    [infoButton addTarget:self action:@selector(showInfoView:) forControlEvents:UIControlEventTouchUpInside];
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:infoButton];

现在需要实现showInfoView方法，使用如下代码：

- (IBAction)showInfoView:(id)sender {

// Create the root view controller for the navigation controller
// The new view controller configures a Cancel and Done button for the
// navigation bar.
InfoViewController *addController = [[InfoViewController alloc]
                                          initWithNibName:@"InfoView" bundle:nil];

// Configure the RecipeAddViewController. In this case, it reports any
// changes to a custom delegate object.
addController.delegate = self;

// Create the navigation controller and present it modally.

UINavigationController *navigationController = [[UINavigationController alloc]
                                                initWithRootViewController:addController];
[self presentModalViewController:navigationController animated:YES];

// The navigation controller is now owned by the current view controller
// and the root view controller is owned by the navigation controller,
// so both objects should be released to prevent over-retention.
[navigationController release];

[addController release];    

}

但是当程序构建并运行时，点击info按钮会导致程序崩溃。

以前有人遇到过这个问题吗？我进行了广泛的搜索，没有发现任何人在实现 showInfoView 方法时遇到问题。

Answer 1

使用此代码：

UIButton* infoButton = [UIButton buttonWithType:UIButtonTypeInfoLight]; 
[infoButton addTarget:self action:@selector(showInfoView:) forControlEvents:UIControlEventTouchUpInside];
self.navigationItem.rightBarButtonItem = infoButton;

如果 nib 文件名是“InfoView.xib”而不是“InfoViewController.xib”，则 showInfoView: 方法应该可以正常工作