在视图控制器中添加多个导航控制器？答案

【问题标题】：Adding multiple navigation controllers inside a view controller?在视图控制器中添加多个导航控制器？
【发布时间】：2010-12-07 16:12:15
【问题描述】：

我正在尝试为 iPhone 实现双 tabBar 应用程序，并为基类视图控制器使用以下代码在视图控制器内添加多个导航控制器（参见下面的代码）。但问题是：没有子视图被添加到 self.view，尽管它们被提前初始化。有什么想法吗？

- (IBAction)ViewButtonPressed:(id)sender
{
    UIButton *b = (UIButton *)sender;
    int index = b.tag - 1000;
    [self SelectNavigationController:index];
}

- (void)SelectNavigationController:(int)index
{
    // Set index to top-most view ->
    UINavigationController *nc = (UINavigationController *)[navigationControllers objectAtIndex:index];
    [self.view bringSubviewToFront:nc.view];
}

#pragma mark -
#pragma mark display

- (void)Display
{
    CGRect frame = CGRectMake(0, 44, 320, 367);

    // Create buttons above frame and show navigation controller inside frame ->

    UIView *v = [[UIView alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, frame.origin.y)];

    for (int i=0; i<[navigationControllers count]; ++i)
    {
        UINavigationController *nc = (UINavigationController *)[navigationControllers objectAtIndex:i];
        UIViewController *vc = [nc.viewControllers objectAtIndex:0];
        NSString *titel = vc.navigationItem.title;

        UIButton *b = [UIButton buttonWithType:UIButtonTypeCustom];
        [b setBackgroundColor:[UIColor lightGrayColor]]; // TODO: Replace with image <-
        [b setTitle:titel forState:UIControlStateNormal];
        b.tag = i + 1000;
        [b setFrame:CGRectMake(i * frame.size.width / 3, 0, frame.size.width / 3, frame.origin.y - 1)];
        [v addSubview:b];
    }

    for (int j=0; j<[navigationControllers count]; ++j)
    {
        UINavigationController *nc = (UINavigationController *)[navigationControllers objectAtIndex:j];
        [nc.navigationBar addSubview:v];
        [self.view addSubview:nc.view]; // Add view to view <-
        nc.view.frame = frame;
    }

    [v release];

    if (VIEW_DEBUG)
        NSLog(@"BaseTabViewController.m: self.view.subviews: %d", [self.view.subviews count]);
}

#pragma mark -
#pragma mark addviewcontroller

- (void)AddViewControllerForNavigationController:(UIViewController *)viewController
{
    UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:viewController];
    navController.view.backgroundColor = [UIColor greenColor];
    [navigationControllers addObject:navController];
    [navController release];
}

#pragma mark -
#pragma mark init, loadView, viewDidLoad and dealloc

- (id)initWithCoder:(NSCoder *)aDecoder
{
    if (self = [super initWithCoder:aDecoder])
    {
        navigationControllers = [[NSMutableArray alloc] init];
    }
    return self;
}

- (void)loadView
{
    //
}

- (void)viewDidLoad
{
    if (!viewDidLoadAlready)
    {
        [self Display];
        viewDidLoadAlready = YES;
        [super viewDidLoad];
    }
}

以及子类中的代码：

- (id)initWithCoder:(NSCoder *)aDecoder
{
    if (self = [super initWithCoder:aDecoder])
    {
        PistKartaViewController *pistKarta = [[PistKartaViewController alloc] init];
        pistKarta.navigationItem.title = @"Pistkarta";
        LiftRapportViewController *liftRapport = [[LiftRapportViewController alloc] init];
        liftRapport.navigationItem.title = @"Liftrapport";
        SkipassViewController *skiPass = [[SkipassViewController alloc] init];
        skiPass.navigationItem.title = @"Skipass";

        [self AddViewControllerForNavigationController:pistKarta];
        [self AddViewControllerForNavigationController:liftRapport];
        [self AddViewControllerForNavigationController:skiPass];

        [pistKarta release];
        [liftRapport release];
        [skiPass release];
    }
    return self;
}

【问题讨论】：

我应该澄清一下：上面的类（第一个代码块）是 tabBar 控制器（从 xib 加载）内的 UIViewController，因此是 initWithCoder 方法。再次感谢您的帮助！
真的需要类似的代码。谢谢你写在这里。但是我不太明白。你能给我源代码链接吗？请帮忙。

标签： iphone cocoa ios ios4

【解决方案1】：

我想通了。我在添加的视图控制器中有以下内容...

- (void)loadView
{

}

，这当然意味着根本不会加载超类。愚蠢的。否则，此方法效果很好。 :)

【讨论】：