![](https://raw.githubusercontent.com/Paulpang/XYTabBarAnimation/master/tabbaranimation.gif)
利用UITabBarController
的UITabBarControllerDelegate
,实现代理方法
- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController
- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController
{
NSInteger index = [tabBarController.childViewControllers indexOfObject:viewController];
UIButton *tabBarBtn = tabBarController.tabBar.subviews[index+1];
UIImageView *imageView = tabBarBtn.subviews.firstObject;
// 切换过了,就停止上一个动画
if (self.currentIndex != index) {
// 把上一个图片的动画停止
[self.currentImageView stopAnimating];
// 把上一个图片的动画图片数组置为空
self.currentImageView.animationImages = nil;
} else {
return NO;
}
imageView.animationImages = self.allImages[index];
imageView.animationRepeatCount = 1;
imageView.animationDuration = ImageCount * 0.025;
// 开始动画
[imageView startAnimating];
// 记录当前选中的按钮的图片视图
self.currentImageView = imageView;
// 记录当前选中的下标
self.currentIndex = index;
return YES;
}
PS
动画的实现,是利用的帧动画,设计对选中的图片做好帧动画图片给到我们