Question

在UITabBarController中，选择标签后，我希望该标签的UIViewController更改（分配新的viewcontroller）。我正在尝试这个 -

NSMutableArray *tabBarViewControllers = [myUITabBarController.viewControllers mutableCopy];
[tabbarViewControllers replaceObjectAtIndex:0 withObject:[[myViewcontroller1 alloc] init]];
[myUITabBarController setViewControllers:tabbarViewControllers];

但它给出了错误。如何分配新的UIViewController并立即刷新？

Answer 1

请参阅此代码，它提供2个带有导航的标签栏。在AppDelegate.h请声明

    UINavigationController *nav1;
    UINavigationController *nav2;
    UITabBarController *tab;

在Appdelegate.m，didFinishLaunchingWithOptions中请添加： -

    tab = [[UITabBarController alloc]init];

    ViewController *view1 = [[ViewController alloc]init];

    nav1= [[UINavigationController alloc]initWithRootViewController:view1];    
    UITabBarItem *tab1 = [[UITabBarItem alloc]initWithTitle:@"Add" image:[UIImage imageNamed:@"Plus.png"] tag:1];
    view1.title = @"Add";
    [view1 setTabBarItem:tab1];

    SettingsViewController *view2 = [[SettingsViewController alloc]init];

    nav2= [[UINavigationController alloc]initWithRootViewController:view2];
    UITabBarItem *tab2 = [[UITabBarItem alloc]initWithTitle:@"Setting" image:[UIImage imageNamed:@"settings.png"] tag:2];
    view2.title = @"Setting";
    [view2 setTabBarItem:tab2];

    tab.viewControllers = [NSArray arrayWithObjects:nav1,nav2,nil];

    self.window.backgroundColor = [UIColor whiteColor];
    self.window.rootViewController = tab;

同时检查此链接以进一步实施...希望这有助于：）

UItabBar changing View Controllers

Answer 2

这是基于女性的答案，但不要求您构建整个视图控制器阵列，它只是让您将现有的视图控制器替换为另一个。在我的情况下，我想换一个不同的xib文件用于iPhone 5屏幕：

if ([[UIScreen mainScreen] bounds].size.height == 568) {
    NSMutableArray *viewControllers = [NSMutableArray arrayWithArray:self.tabBarController.viewControllers];
    Tracking *tracking568h = [[Tracking alloc] initWithNibName:@"Tracking-568h" bundle:nil];
    tracking568h.title = [[viewControllers objectAtIndex:0] title];
    tracking568h.tabBarItem = [[viewControllers objectAtIndex:0] tabBarItem];
    [viewControllers replaceObjectAtIndex:0 withObject:tracking568h];
    [tracking568h release];
    [self.tabBarController setViewControllers:viewControllers animated:FALSE];
}

这将更改第一个选项卡的视图控制器，保留相同的选项卡图标和标签。

Answer 3

在AppDelegate.h

中

UIViewController *vc1;
UIViewController *vc2;
UIViewController *vc3;

Appdelegate.m

中的

didFinishLaunchingWithOptions

中的

NSMutableArray *listOfViewControllers = [[NSMutableArray alloc] init];

vc1 = [[UIViewController alloc] init];
vc1.title = @"A";
[listOfViewControllers addObject:vc1];

vc2 = [[UIViewController alloc] init];
vc2.title = @"B";
[listOfViewControllers addObject:vc2];

vc3 = [[UIViewController alloc] init];
vc3.title = @"C";
[listOfViewControllers addObject:vc3];

[self.tabBarController setViewControllers:listOfViewControllers
                                 animated:YES];

更改UITabBarController的视图控制器

3 个答案: