iOS - 设置TabBarItem被选中时的背景

在TabBarController中设置代理并遵守协议<UITabBarControllerDelegate>

- (void)viewDidLoad {    [super viewDidLoad];    self.delegate = self;        // 添加选中的背景    self.itemSelectedBg = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"tab_bg_halo"]];    self.itemSelectedBg.frame = CGRectMake(0, 0, kScreenW / 4, 49);    [self.tabBar addSubview:self.itemSelectedBg];}

实现代理方法

- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController {    NSInteger index = tabBarController.selectedIndex;    self.itemSelectedBg.frame = CGRectMake(index * kScreenW / 4, 0, kScreenW / 4, 49);}

OK,完事~