Ios 如何使选项卡栏自定义动画仅针对某个视图控制器出现？

我有一个选择选项卡时的自定义动画，但我希望该动画仅在单击某个选项卡时出现。我猜这与

toView

的实例化有关。错误

这是视图控制器代码

override func viewDidLoad() {
    super.viewDidLoad()

    let animatedTransitioningObject = TransitioningObject()
    animatedTransitioningObject.animateTransition(UIViewControllerContextTransitionin) //I get an error here
    // Do any additional setup after loading the view.
}

-（void）animateTransfion:（id）transitionContext
{
UIViewController*toViewController=[transitionContext ViewControllerWorky:UITransitionContextToViewControllerKey]；
UIViewController*fromViewController=[transitionContext ViewControllerWorky:UITransitionContextFromViewControllerKey]；
[[transitionContext containerView]添加子视图：toViewController.view]；
toViewController.view.alpha=0；
[UIView animateWithDuration:[self-transitionDuration:transitionContext]动画：^{
fromViewController.view.transform=CGAffineTransformMakeScale（0.1,0.1）；
toViewController.view.alpha=1；
}完成：^（布尔完成）{
fromViewController.view.transform=CGAffineTransformity；
[transitionContext completeTransition:！[transitionContext transitionWasCancelled]；
}];

}

是动画函数的外观

另外，如果你想要一个为你做这件事的豆荚，我建议你看看这个豆荚

override func viewDidLoad() {
    super.viewDidLoad()

    let animatedTransitioningObject = TransitioningObject()
    animatedTransitioningObject.animateTransition(UIViewControllerContextTransitionin) //I get an error here
    // Do any additional setup after loading the view.
}

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{
  UIViewController* toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
  UIViewController* fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
  [[transitionContext containerView] addSubview:toViewController.view];
  toViewController.view.alpha = 0;

  [UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{
    fromViewController.view.transform = CGAffineTransformMakeScale(0.1, 0.1);
    toViewController.view.alpha = 1;
  } completion:^(BOOL finished) {
      fromViewController.view.transform = CGAffineTransformIdentity;
      [transitionContext completeTransition:![transitionContext transitionWasCancelled]];

}];