标签: tabbar

刚学flutter，对TabController的使用很迷茫，按照官网的描述做了，但是出现错误，不知道怎么解决。

我只想在更改选项卡时更改标题并从应用栏引导。

final List<ChangeTitleAndLeading> _data = [
  new ChangeTitleAndLeading(title: "Home", leading: Icon(Icons.home)),
  new ChangeTitleAndLeading(title: "Profile", leading: Icon(Icons.person)),
  new ChangeTitleAndLeading(title: "Friends", leading: Icon(Icons.people))
];

ChangeTitleAndLeading _handler;
TabController _controller;

@override
void initState() {
  super.initState();

  _checkEmailVerification();

  _controller = TabController(vsync: this, length: 3);
  _handler = _data[0];
  _controller.addListener(_handleSelected);
}

@override
void dispose() {
  _controller.dispose();
  super.dispose();
}

void _handleSelected() {
  setState(() {
    _handler = _data[_controller.index];
  });
}

return MaterialApp(
  theme: new ThemeData(
    primarySwatch: Colors.teal,
  ),
  home: new Scaffold(
    appBar: new AppBar(
      leading: Icon(Icons.home),
      title: new Text("Home"), …

如何TabView在SwiftUI中为选中的Tabbar项目设置动画？

例如，给选定的项目一个.scaleEffect()带有.spring()动画或某物的内容，如下所示：

到目前为止，这是我尝试过的：

struct MyTabbedView: View {
    @State var enlargeIt1 = false
    @State var enlargeIt2 = true

    var body: some View {
        TabView {
            Text("Item 1")
                .onAppear {
                    self.enlargeIt1.toggle()
                    self.enlargeIt2.toggle()
                }
                .tabItem{
                    VStack{
                        Image(systemName: "music.note")
                            .font(self.enlargeIt1 ? .system(size: 30) : .system(size: 15) )
                            .animation(.interpolatingSpring(mass: 0.7, stiffness: 200, damping: 10, initialVelocity: 4))
                        Text("Music")
                    }
                }.tag(1)

            Text("Item 2")
                .onAppear {
                    self.enlargeIt1.toggle()
                    self.enlargeIt2.toggle()
                }
                .tabItem{
                    VStack{
                        Image(systemName: "music.mic")
                            .font(self.enlargeIt2 ? .system(size: 30) : .system(size: 15) )
                            .animation(.interpolatingSpring(mass: …

我在从 Xcode 11 编译时遇到了 iOS13 的 tabBar 标题问题。它在从 Xcode 10 编译时完美运行。请找到问题的屏幕截图，下面是自定义 tabBar 的代码。

代码是

self.tabBar.isTranslucent = true
self.tabBar.tintColor = UIColor.white
UITabBarItem.appearance().badgeColor = Constant.Colors.colorFF1744
if #available(iOS 13, *) {
    let appearance = UITabBarAppearance.init()
    appearance.stackedLayoutAppearance.normal.titleTextAttributes = [NSAttributedString.Key.font:UIFont(name: Constant.FontNames.RubikRegular, size: Constant.FontSize.P5heading)!,NSAttributedString.Key.foregroundColor:Constant.Colors.color8D8D8D]
    appearance.stackedLayoutAppearance.selected.titleTextAttributes = [NSAttributedString.Key.font:UIFont(name: Constant.FontNames.RubikRegular, size:Constant.FontSize.P5heading)!,NSAttributedString.Key.foregroundColor:Constant.Colors.colorFF1744]
    appearance.stackedItemPositioning = .automatic
    self.tabBar.standardAppearance = appearance
} else {
    UITabBarItem.appearance().setTitleTextAttributes([NSAttributedString.Key.font:UIFont(name: Constant.FontNames.RubikRegular, size: Constant.FontSize.P5heading)!, NSAttributedString.Key.foregroundColor:Constant.Colors.color8D8D8D], for: .normal)
    UITabBarItem.appearance().setTitleTextAttributes([NSAttributedString.Key.font:UIFont(name: Constant.FontNames.RubikRegular, size: Constant.FontSize.P5heading)!, NSAttributedString.Key.foregroundColor:Constant.Colors.colorFF1744], for: .selected)
}

我正在使用基于选项卡栏的应用程序，并且在详细信息屏幕上选项卡栏被隐藏。问题是当选项卡栏隐藏时，它仍然会占据选项卡栏的空白区域并且safeAreaLayoutInsets不会更新。当方向改变或从背景移动到前景时，它会起作用。

self.tabBarController.tabBar.hidden = YES;

查看层次结构

UITabbarController
  |--UISplitViewController
     |--UIViewController (first VC)
        |--UINavigationController
           |--UIViewController (second VC)

该问题与Apple 论坛中报告的问题类似

我有一个iPhone应用程序:当你打开应用程序时,你会看到"LoginView".如果您登录到应用程序,您会看到一个TabBarController.在第三个和最后一个选项卡中有"注销"按钮.如果单击,则会再次看到"LoginView".我的问题是,如果你再次登录,你会看到"旧"标签栏,所选标签是第三个,而不是一个标签,并且有一个"退出"按钮.此外,如果用户使用其他用户登录,请查看上一个用户的旧数据(非常危险).

这是代码: - Delegate.h:

UITabBarController *tabBarController;
LoginViewController *loginView;

- Delegate.m(didFinishLaunchingWithOptions):

[self.window makeKeyAndVisible];

loginView = [[LoginViewController alloc] init];

if (YES) { /* if the user is not already logged */
    [self.window addSubview:loginView.view];
}

Delegate.m(方法):

- (void)loginComplete {
    [loginView dismissModalViewControllerAnimated:YES];
    [window addSubview:tabBarController.view];
}

- (void)logoutComplete {
    [[tabBarController view] removeFromSuperview];
    [tabBarController release];
    [window addSubview:loginView.view];
}

这是两个不同viewcontrollers中的两种方法:

- (IBAction)login:(id)sender {

     TabNavisAppDelegate *delegate =
      (TabNavisAppDelegate *) [[UIApplication sharedApplication] delegate];
  [delegate loginComplete];
  }

(注销方法是一样的)

伙计们,我该如何解决这个痛苦的问题呢？所以,这里有一个我想要的应用程序列表:"Foursquare","Brightkite"等.每个人都有一个登录屏幕,一个标签栏视图和一个注销按钮.

感谢大家.

我正在使用TabBar应用程序.在一个视图中有一个UISearchBar,当按下时,键盘出现.

问题是键盘隐藏了标签栏.

你知道怎么解决吗？

我在其中创建了一个tabBar并设置了图像,但是在它下方留下了太多的空间tabBarItem.我怎么能删除它？

这是我tabBar现在的显示

我想像这样展示它

显示Tabbar

firstVC = [[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil];
secondVC = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];
thirdVC = [[ThirdViewController alloc] initWithNibName:@"ThirdViewController" bundle:nil];
forthVC = [[ForthViewController alloc] initWithNibName:@"ForthViewController" bundle:nil];

    [[UITabBar appearance] setTintColor:[UIColor whiteColor]];

    NSArray *viewControllersArray = [[NSArray alloc] initWithObjects:firstVC,secondVC,thirdVC,forthVC, nil];

    self.tabController = [[UITabBarController alloc] init];
    [self.tabController setViewControllers:viewControllersArray animated:NO];


    [self.window addSubview:self.tabController.view];

    //self.tabController.selectedIndex = 1;

    self.tabController.delegate = self;

    self.window.rootViewController = self.tabController;
    [self.window makeKeyAndVisible];

对于tabBar背景图片我使用了这段代码

UIImage* tabBarBackground = [UIImage imageNamed:@"tabbarimg1.png"];
[[UITabBar appearance] setBackgroundImage:tabBarBackground];

并设置img项目我已使用此代码

//used to set the …

我有一个iOS 7应用程序,在TabbarController中有一个NavigationController.然后我自定义条形背景颜色

[[UINavigationBar appearance] setBarTintColor:[UIColor blueColor]];
[[UITabBar appearance] setBarTintColor:[UIColor blueColor]];

它运行正常.但如果有一个ViewController想要不被酒吧覆盖的话,就像这样

self.edgesForExtendedLayout = UIRectEdgeTop;

这意味着这个ViewController不希望被Tabbar覆盖.但它使Tabbar 比正常更暗

我想这是因为我为酒吧使用自定义颜色.怎么修 ？

我们试图将标签栏图标居中到标签栏中心,因为我们不希望在下面显示文本.因此图标应该是单独的并且在标签栏中居中.这就是他们现在的样子.标签栏控制器不是根视图控制器,因此我们无法使用rootviewcontroller直接访问它,因为我们在那里找到了很多响应.有任何想法吗？我们变得疯狂......

我正在尝试使用颤振在屏幕中央创建一个标签栏，同时尝试它我在列中提供了 TabBarView 并且我陷入了这个错误。请解决这个问题。

I/flutter ( 3983): ??? EXCEPTION CAUGHT BY RENDERING LIBRARY ??????????????????????????????????????????????????????????
I/flutter ( 3983): The following assertion was thrown during performResize():
I/flutter ( 3983): Horizontal viewport was given unbounded height.
I/flutter ( 3983): Viewports expand in the cross axis to fill their container and constrain their children to match
I/flutter ( 3983): their extent in the cross axis. In this case, a horizontal viewport was given an unlimited amount of
I/flutter ( 3983): vertical space in which to …