右栏按钮项目不显示

我有以下用于放置 rightbarbuttonitem 的代码

UIButton* rightbutton = [UIButton buttonWithType:UIButtonTypeCustom];
    [rightbutton setBackgroundImage:[UIImage imageNamed:@"share-icon.png"] forState:UIControlStateNormal];
    [rightbutton addTarget:self action:@selector(share:) forControlEvents:UIControlEventTouchUpInside];
    self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithCustomView:rightbutton] autorelease];

但它没有显示任何栏按钮项目。相反，如果我使用以下代码，则会出现栏按钮项目，但问题是我无法在栏按钮项目上使用此代码设置触摸事件。

UIImageView *iconView=[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"dashboard-icon.png"]];
    UIBarButtonItem *icon = [[UIBarButtonItem alloc] initWithCustomView:iconView];
    self.navigationItem.leftBarButtonItem=icon;
    [icon release];
    [iconView release];

我的猜测是，你添加UIBarButtonItem找错对象了！ 您需要将其添加到 rootViewController （而不是添加到UINavigationController，正如您可能所做的那样）

YourRootViewController *theRootController = [[YourRootViewController alloc] init];

UINavigationController* navContainer = [[UINavigationController alloc] initWithRootViewController:theRootController];

UIButton* rightbutton = [UIButton buttonWithType:UIButtonTypeCustom];
    [rightbutton setBackgroundImage:[UIImage imageNamed:@"share-icon.png"] forState:UIControlStateNormal];
    [rightbutton addTarget:self action:@selector(share:) forControlEvents:UIControlEventTouchUpInside];
 theRootController.navigationItem.rightBarButtonItem = rightbutton;

[navContainer setModalTransitionStyle:UIModalTransitionStyleCrossDissolve];
[self presentModalViewController:navContainer animated:YES];