摘要：
我在网上搜索了很长时间，没有找到结果。
1.有时，我们需要为tabBarItem设置一些动画。在网上查了半天，没有结果。自己写了一个简单的动画
代码如下：
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController{ NSInteger currentIndex = tabBarController.selectedIndex; NSInteger index = 0; UITabBar *tabBar = tabBarController.tabBar; for (int i = 0; i < tabBar.subviews.count; i++) { UIView *button = tabBar.subviews[i]; if ([button isKindOfClass:NSClassFromString(@"UITabBarButton")]) { if (index != currentIndex) { index++; } else{ CAKeyframeAnimation *animation = [[CAKeyframeAnimation alloc]init]; animation.keyPath = @"transform.scale"; animation.duration = 1.0; animation.values = @[@(1.0) ,@(1.4), @(0.9), @(1.15), @(0.95), @(1.02), @(1.0)]; UIView *imageview = [button.subviews firstObject]; //view.backgroundColor = [UIColor greenColor]; [imageview.layer addAnimation: animation forKey:nil]; UIView *labelview = [button.subviews lastObject]; [labelview.layer addAnimation:animation forKey:nil]; break; } } } }