2018-12-26 自定义TabBar点击动画

效果如下：

fdabcf8d6aaf94559c701393b7c7d1aa.GIF

首页点击2次执行刷新，其他点1次有个缩放动画

主要代码：

- (void)tabBar:(UITabBar*)tabBar didSelectItem:(UITabBarItem*)item{

     //消除上次首页点击刷新动画

     [self.animationImageV.layer removeAllAnimations];

     [self.animationImageV removeFromSuperview];

     // 判断本次点击的UITabBarItem是否和上次的一样

     if (item == self.lastItem && [CommParms shareInstance].user) { // 一样就发出通知

          [[NSNotificationCenter defaultCenter] postNotificationName:TabbarDidClickedNotification object:nil userInfo:nil];

     }

     NSInteger index = [self.tabBar.items indexOfObject:item];

     if(item ==self.lastItem&& index ==0) {//连续点击首页2次，

          //执行首页刷新动画

          [self homeRefreshAnimation];

     }else{//其他情况

          //简单的缩放动画

          [selfanimationWithIndex:index];

     }

     // 将这次点击的UITabBarItem赋值给属性

     self.lastItem= item;

}

// 首页刷新动画

- (void)homeRefreshAnimation{

     NSMutableArray * tabbarbuttonArray = [NSMutableArray array];//创建btn数组

     NSMutableArray* tabbarbuttonImgArray = [NSMutableArrayarray];//创建img数组

     for(UIView*tabBarButtoninself.tabBar.subviews) {

          if([tabBarButtonisKindOfClass:NSClassFromString(@"UITabBarButton")]) {

               [tabbarbuttonArrayaddObject:tabBarButton];//添加到btn数组

               for(UIView*imageViewintabBarButton.subviews) {

                    if([imageViewisKindOfClass:NSClassFromString(@"UITabBarSwappableImageView")]) {

                         [tabbarbuttonImgArrayaddObject:imageView];//添加到img数组

                    }

               }

          }

     }

     UIView*firstTabBarBtn = tabbarbuttonArray[0];//第一个tabBarBtn

     UIView*firstTabBarImgV = tabbarbuttonImgArray[0];//第一个图片

     UIImageView*animationImageV = [[UIImageViewalloc]initWithFrame:firstTabBarImgV.frame];

     self.animationImageV= animationImageV;

     self.firstTabBarImgV= firstTabBarImgV;

     animationImageV.image= [UIImageimageNamed:@"icon_TaBarRefresh"];

     [firstTabBarBtnaddSubview:animationImageV];

     firstTabBarImgV.hidden=YES;

     CABasicAnimation *rotation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];

     rotation.timingFunction= [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];

     rotation.duration=0.88;

     rotation.repeatCount=1;

     rotation.autoreverses=NO;

     rotation.fromValue= [NSNumber numberWithFloat:0];

     rotation.toValue= [NSNumber numberWithFloat:M_PI * 2];

     rotation.delegate=self;

     [animationImageV.layeraddAnimation:rotationforKey:nil];

}

// 简单的缩放动画

- (void)animationWithIndex:(NSInteger) index {

     NSMutableArray * tabbarbuttonArray = [NSMutableArray array];//创建btn数组

     for(UIView*tabBarButtoninself.tabBar.subviews) {

          if([tabBarButtonisKindOfClass:NSClassFromString(@"UITabBarButton")]) {

               [tabbarbuttonArrayaddObject:tabBarButton];//添加到btn数组

          }

     }

     CABasicAnimation*pulse = [CABasicAnimation animationWithKeyPath:@"transform.scale"];

     pulse.timingFunction= [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];

     pulse.duration=0.12;

     pulse.repeatCount=1;

     pulse.autoreverses=YES;

     pulse.fromValue= [NSNumber numberWithFloat:0.7];

     pulse.toValue= [NSNumber numberWithFloat:1.3];

     [[tabbarbuttonArray[index]layer]addAnimation:pulseforKey:nil];

}

#pragma mark -----CAAnimationDelegate

- (void)animationDidStop:(CAAnimation*)anim finished:(BOOL)flag{

     [_animationImageV removeFromSuperview];

     _firstTabBarImgV.hidden = NO;

}