UITabBarController知识整理

特性

 * UITabBarController上的视图是平行关系，他们之间不能做页面跳转 * UITabBarController上的页面都是同时加载出来的 * 页面数大于五 自动生成more

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实例化

     UITabBarController *tabBarController = [[UITabBarController alloc]init];     self.window.rootViewController = tabBarController;

标题

只有视图控制器设置标题时 .title与 .tabBarItem.title无区别插入导航控制器时:1. view.title                     同时给tabBar与navigationBar设置标题2. view.navigationItem.title      只给导航栏设置标题3. view.tabBarItem.title          无效4. nav.title                      只给tabBar设标题5. nav.tabBarItem.title           只给tabBar设标题6. nav.navigationItem.title       无效

元素图片设置

//设置图片     view.tabBarItem.image = <#(UIImage *)#>;     nav.tabBarItem.image = <#(UIImage *)#>;//设置图片 标题     UITabBarItem *tab = [[UITabBarItem alloc]initWithTitle:<#(NSString *)#> image:<#(UIImage *)#> tag:<#(NSInteger)#>];     nav.tabBarItem = tab;//系统自带图片 标题     UITabBarItem *tab = [[UITabBarItem alloc]initWithTabBarSystemItem:<#(UITabBarSystemItem)#> tag:<#(NSInteger)#>];     view.tabBarItem = tab;//设置选中前及选中后图片     //iOS7之前的写法     [nav.tabBarItem setFinishedSelectedImage:<#(UIImage *)#> withFinishedUnselectedImage:<#(UIImage *)#>];     //iOS7之后     UITabBarItem *tab = [[UITabBarItem alloc]initWithTitle:<#(NSString *)#> image:<#(UIImage *)#> selectedImage:<#(UIImage *)#>];     view.tabBarItem = tab;

设置徽标

     nav.tabBarItem.badgeValue = <#(NSString *)#>;

图文渲染 (让图片保持原样显示)

//选中前     view.tabBarItem.image = [<#(UIImage *)#> imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];//选中后     view.tabBarItem.selectedImage = [<#(UIImage *)#> imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

文字渲染

//选中前    NSDictionary *dic1 = @{NSForegroundColorAttributeName:<#(UIColor *)#>,NSFontAttributeName : [UIFont systemFontOfSize:11.0]};     [view.tabBarItem setTitleTextAttributes:dic1 forState:UIControlStateNormal];//选中后     NSDictionary *dic2 = @{NSForegroundColorAttributeName:<#(UIColor *)#>,NSFontAttributeName : [UIFont systemFontOfSize:11.0]};     [view.tabBarItem setTitleTextAttributes:dic2 forState:UIControlStateSelected];//UITabBarControllers 子类中     [[UITabBarItem appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName:ColorW,NSFontAttributeName:Font(9.0f)} forState:UIControlStateNormal];

添加元素

    NSArray *viewControllers = @[view1,view2,nav3,nav4,view5,view6,nav7];    tabBarController.viewControllers = viewControllers;//设置默认选中    tabBarController.selectedIndex = 2;    tabBarController.selectedViewController = viewControllers[2];//类型    tabBarController.tabBar.barStyle = UIBarStyleDefault;//颜色    tabBarController.tabBar.barTintColor = <#(UIColor *)#>;//设置背景图片    tabBarController.tabBar.backgroundImage = <#(UIImage *)#>;    tabBarController.delegate = self;

代理方法

//点击Edit- (void)tabBarController:(UITabBarController *)tabBarController willBeginCustomizingViewControllers:(NSArray *)viewControllers {}//点击Done即将完成时- (void)tabBarController:(UITabBarController *)tabBarController willEndCustomizingViewControllers:(NSArray *)viewControllers changed:(BOOL)changed {}//点击视图控制器- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController {}//点击Done- (void)tabBarController:(UITabBarController *)tabBarController didEndCustomizingViewControllers:(NSArray *)viewControllers changed:(BOOL)changed {}