erhu1993 / erhudemo Goto Github PK

博主，我按照你添加动画的方式给imageView添加了动画效果，但启动App后第一次点击之前没有选中过的item没有动画，再点击就有动画了，你有遇到吗？

`-(void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController{
DLog(@"选中 %ld",tabBarController.selectedIndex);
[self addTabBarButtonRotationAnimationWithCurrentViewController:viewController index:tabBarController.selectedIndex];
}

• (void)addTabBarButtonRotationAnimationWithCurrentViewController:(UIViewController *)currentViewController index:(NSInteger )index{

  UIImageView *tabBarSwappableImageView = [self getTabBarButtonImageViewWithCurrentVc:currentViewController];

  if (tabBarSwappableImageView) {

    CASpringAnimation *springAnimation = [CASpringAnimation animationWithKeyPath:@"bounds"];
    springAnimation.fromValue = [NSValue valueWithCGRect:CGRectMake(tabBarSwappableImageView.centerX, tabBarSwappableImageView.centerY, tabBarSwappableImageView.width*0.85, tabBarSwappableImageView.width*0.85)];
    springAnimation.toValue = [NSValue valueWithCGRect:tabBarSwappableImageView.frame];
    //质量，影响图层运动时的弹簧惯性，质量越大，弹簧拉伸和压缩的幅度越大 Defaults to one
    springAnimation.mass = 3;
    //刚度系数(劲度系数/弹性系数)，刚度系数越大，形变产生的力就越大，运动越快 Defaults to 100
    springAnimation.stiffness = 1300;
    //阻尼系数，阻止弹簧伸缩的系数，阻尼系数越大，停止越快 Defaults to 10
    springAnimation.damping = 20;
    //速率为正数时，速度方向与运动方向一致，速率为负数时，速度方向与运动方向相反
    springAnimation.initialVelocity = -10   ;
    //估算时间 返回弹簧动画到停止时的估算时间，根据当前的动画参数估算
    springAnimation.duration = springAnimation.settlingDuration;
    springAnimation.removedOnCompletion = YES;
    
    [[tabBarSwappableImageView layer] addAnimation:springAnimation forKey:nil];
    NSLog(@"添加");
  

  }
  }

• (UIImageView *)getTabBarButtonImageViewWithCurrentVc:(UIViewController *)currentViewController{

  UIControl *tabBarButton = [currentViewController.tabBarItem valueForKey:@"view"];
  if (tabBarButton) {
  UIImageView *tabBarSwappableImageView = [tabBarButton valueForKey:@"info"];
  if (tabBarSwappableImageView) {
  return tabBarSwappableImageView;
  }
  }
  return nil;
  }`

tabbaritem刷新动画的时候，想同时修改下文字，怎么修改？用的哪个kvo