上拉、下拉UITableView，交互式 模态弹出（自定义弹出动画）

- (instancetype)initWithPresentingController:(UITableViewController *)presentingVc presentedController:(UIViewController *)presentedVc {
    self = [super init];
    if (self) {
        self.vc = presentedVc;
        self.vc.transitioningDelegate =self;
        self.presentingVc = presentingVc;
    }
    return self;
}

- (void)new_scrollViewWillBeginDragging:(UIScrollView *)scrollView {
    self.interactiveTransition = [[UIPercentDrivenInteractiveTransition alloc]init];
    [self.presentingVc presentViewController:self.vc animated:YES completion:nil];
}

- (void)new_scrollViewDidScroll:(UIScrollView *)scrollView {
    
    CGFloat offsetY = fabs(scrollView.contentOffset.y);
    
    CGFloat screenH = [UIScreen mainScreen].bounds.size.height / 3.0;
    progress = offsetY / screenH;
    progress = progress-0.3;
    if (progress > 0) {
        [self.interactiveTransition updateInteractiveTransition:progress];
    }
    
}
- (void)new_scrollViewWillEndDragging {
    if (progress < 0.4) {
        [self.interactiveTransition cancelInteractiveTransition];
    }else {
        [self.interactiveTransition finishInteractiveTransition];
    }
    self.interactiveTransition = nil;
}

- (nullable id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source {
    
    return self.animation;
}

- (id<UIViewControllerInteractiveTransitioning>)interactionControllerForPresentation:(id<UIViewControllerAnimatedTransitioning>)animator {
    
    return self.interactiveTransition;
}

- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext {
    return 1.0;
}

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {
    
    UIView *toView = [transitionContext viewForKey:UITransitionContextToViewKey];
    UIView *containerView = [transitionContext containerView];
    [containerView addSubview:toView];
    
    toView.frame = CGRectMake(50, containerView.bounds.size.height, containerView.bounds.size.width - 100, containerView.bounds.size.height - 300);
    
    [UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{
        toView.frame = containerView.bounds;
    }completion:^(BOOL finished) {
        [transitionContext completeTransition:![transitionContext transitionWasCancelled]];
    }];
    
}

- (InteractiveTransition *)interactive {
    if (!_interactive) {
        _interactive = [[InteractiveTransition alloc]initWithPresentingController:self presentedController:[[TwoViewController alloc]init]];
    }
    return _interactive;
}
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
    
    [self.interactive new_scrollViewWillBeginDragging:scrollView];
}


- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset {
    
    [self.interactive new_scrollViewWillEndDragging];
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    
    [self.interactive new_scrollViewDidScroll:scrollView];
}