单手操作 iPhone 6 Plus 切换 TabBar 一直是一件很痛苦的事情，而滑动切换是一种不错的解决方案，希望这种交互方式能够得到广泛地应用。
你可以通过 CocoaPods 来安装 WXTabBarController ：
pod 'WXTabBarController', '~> 0.1'WXTabBarController 的用法与系统 UITabBarController 的用法是完全一致的：
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds]; self.window.rootViewController = self.navigationController; [self.window makeKeyAndVisible]; return YES; } - (UINavigationController *)navigationController { if (_navigationController == nil) { UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:self.tabBarController]; navigationController.navigationBar.tintColor = [UIColor colorWithRed:26 / 255.0 green:178 / 255.0 blue:10 / 255.0 alpha:1]; _navigationController = navigationController; } return _navigationController; } - (WXTabBarController *)tabBarController { if (_tabBarController == nil) { WXTabBarController *tabBarController = [[WXTabBarController alloc] init]; ViewController *mainframeViewController = ({ ViewController *mainframeViewController = [[ViewController alloc] init]; UIImage *mainframeImage = [UIImage imageNamed:@"tabbar_mainframe"]; UIImage *mainframeHLImage = [UIImage imageNamed:@"tabbar_mainframeHL"]; mainframeViewController.title = @"微信"; mainframeViewController.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"微信" image:mainframeImage selectedImage:mainframeHLImage]; mainframeViewController.view.backgroundColor = [UIColor colorWithRed:48 / 255.0 green:67 / 255.0 blue:78 / 255.0 alpha:1]; mainframeViewController.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"barbuttonicon_add"] style:UIBarButtonItemStylePlain target:self action:@selector(didClickAddButton:)]; mainframeViewController; }); ViewController *contactsViewController = ({ ViewController *contactsViewController = [[ViewController alloc] init]; UIImage *contactsImage = [UIImage imageNamed:@"tabbar_contacts"]; UIImage *contactsHLImage = [UIImage imageNamed:@"tabbar_contactsHL"]; contactsViewController.title = @"通讯录"; contactsViewController.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"通讯录" image:contactsImage selectedImage:contactsHLImage]; contactsViewController.view.backgroundColor = [UIColor colorWithRed:115 / 255.0 green:155 / 255.0 blue:6 / 255.0 alpha:1]; contactsViewController; }); ViewController *discoverViewController = ({ ViewController *discoverViewController = [[ViewController alloc] init]; UIImage *discoverImage = [UIImage imageNamed:@"tabbar_discover"]; UIImage *discoverHLImage = [UIImage imageNamed:@"tabbar_discoverHL"]; discoverViewController.title = @"发现"; discoverViewController.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"发现" image:discoverImage selectedImage:discoverHLImage]; discoverViewController.view.backgroundColor = [UIColor colorWithRed:32 / 255.0 green:85 / 255.0 blue:128 / 255.0 alpha:1]; discoverViewController; }); ViewController *meViewController = ({ ViewController *meViewController = [[ViewController alloc] init]; UIImage *meImage = [UIImage imageNamed:@"tabbar_me"]; UIImage *meHLImage = [UIImage imageNamed:@"tabbar_meHL"]; meViewController.title = @"我"; meViewController.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"我" image:meImage selectedImage:meHLImage]; meViewController.view.backgroundColor = [UIColor colorWithRed:199 / 255.0 green:135 / 255.0 blue:56 / 255.0 alpha:1]; meViewController; });****** tabBarController.title = @"微信"; tabBarController.tabBar.tintColor = [UIColor colorWithRed:26 / 255.0 green:178 / 255.0 blue:10 / 255.0 alpha:1]; tabBarController.viewControllers = @[ [[UINavigationController alloc] initWithRootViewController:mainframeViewController], [[UINavigationController alloc] initWithRootViewController:contactsViewController], [[UINavigationController alloc] initWithRootViewController:discoverViewController], [[UINavigationController alloc] initWithRootViewController:meViewController], ]; _tabBarController = tabBarController; } return _tabBarController; }唯一一个需要注意的地方是，整个应用是由 WXTabBarController 的 navigationController 来进行导航的，而不是 Tab 页自己的 navigationController ：
- (void)didClickAddButton:(id)sender { ViewController *viewController = [[ViewController alloc] init]; viewController.title = @"添加"; viewController.view.backgroundColor = [UIColor colorWithRed:26 / 255.0 green:178 / 255.0 blue:10 / 255.0 alpha:1]; [self.navigationController pushViewController:viewController animated:YES]; }为了更直观地理解这个约定，我们一起来看一下整个应用的导航层次结构图：
目前，WXTabBarController 已经在 MVVMReactiveCocoa 中正式使用，效果如下：
如果你有兴趣为这个库贡献代码的话，请先 Fork 这个库，然后在自己的库上做修改，最后提交 Pull request :
git clone https://github.com/your-username/WXTabBarController.git cd WXTabBarController pod installWXTabBarController is available under the MIT license. See the LICENSE file for more info.