Question

Hello朋友我添加了<代码>UIImageView和:BarButtonItem,Navigationbar,载于rootViewController,点击BarButten。主计长。每一件工作都是罚款的,但一看一看一看一看一看二读。看不见。任何人都可以告诉我如何解决这一问题。



nav = [[UINavigationController alloc] init];
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, nav.navigationBar.frame.size.width, nav.navigationBar.frame.size.height)];
if(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
{
    UIImage *navImage = [UIImage imageNamed:@"NavBar-iPad.png"];
    imageView.image = navImage;
}
else
{
    UIImage *navImage = [UIImage imageNamed:@"NavBar-iPhone.png"];
    imageView.image = navImage;
}

[nav.navigationBar addSubview:imageView];
[imageView release];

[nav pushViewController:viewController animated:YES];

Answer 1

I think you are trying to add a custom background to UInavigationBar. Try This Link to add Custom Background Image in iOS 5

Answer 2

The reason it disappears is that every UIViewController has it s own set of buttons/titles to display on the Navigation Bar. So when you push a new view, it automatically hides the buttons/title of the one below.

If you want buttons that look the same, you have to recreate them in the new UIViewController.

If you need EXACTLY those buttons, instead of pushing a new view controller like you are now, you can do this:

UINavigationController * navcontrol = [[UINavigationController alloc] initWithRootViewController: viewcontroller];
[navcontrol setNavigationBarHidden: YES];
[self.navigationController pushViewController: navcontrol animated:YES];
[navcontrol release];
[viewcontroller release];

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