Question

我有一个使用UIPercentDrivenInteractiveTransition和UIViewControllerAnimatedTransitioning的自定义解雇动画。它由展开segue启动，转换委托在prepareForSegue:中设置。

在我的呈现视图控制器中，展开IBAction会在我开始segue时立即调用，而不是在segue完成时调用。这是有问题的，因为我的解雇动画是手势驱动的，所以我们不知道需要多长时间才能完成。

有没有办法知道segue何时完成动画？

viewWillAppear:和viewDidAppear:似乎都没有在完成时被调用，我认为这是因为segue是一个展开的segue。

Answer 1

完成后捕捉动画，你可以使用它。

- (void)perform {
      [CATransaction begin];
        [[self sourceViewController] presentViewController:[self destinationViewController] animated:YES completion:nil];
      [CATransaction setCompletionBlock:^{
            //whatever you want to do after the animation
      }];
      [CATransaction commit];
    }

Answer 2

这在UIStoryboardSegue.h中进行了解释：

                if (request()->has('image')) {
                    $postall = $user->posts()->with('comments', 'tags')->whereIn('privacy', [1, 2])->where('type', '=', 4)->where('status', 1)->where('archived', 0)->latest()
                        ->paginate(15)->appends('image', request('image'));
                } elseif (request()->has('video')) {
                    $postall = $user->posts()->with('comments', 'tags')->whereIn('privacy', [1, 2])->where('type', '=', 5)->where('status', 1)->where('archived', 0)->latest()
                        ->paginate(15)->appends('video', request('video'));
                } elseif (request()->has('audio')) {
                    $postall = $user->posts()->with('comments', 'tags')->whereIn('privacy', [1, 2])->where('type', '=', 6)->where('status', 1)->where('archived', 0)->latest()
                        ->paginate(15)->appends('audio', request('audio'));
                } elseif (request()->has('text')) {
                    $postall = $user->posts()->with('comments', 'tags')->whereIn('privacy', [1, 2])->whereIn('type', [1, 2, 3, 8])->where('status', 1)->where('archived', 0)->latest()
                        ->paginate(15)->appends('text', request('text'));
                } else {
                    $postall = $user->posts()->with('comments', 'tags')->whereIn('posts.privacy', [1, 2])->where('posts.type', '!=', 7)->where('posts.status', 1)->where('posts.archived', 0)->latest()->paginate(15);
                }

例如

/// Subclasses can override this method to augment or replace the effect of this segue. For example, to animate alongside the effect of a Modal Presentation segue, an override of this method can call super, then send -animateAlongsideTransition:completion: to the transitionCoordinator of the destinationViewController.
/// The segue runtime will call +[UIView setAnimationsAreEnabled:] prior to invoking this method, based on the value of the Animates checkbox in the Properties Inspector for the segue.
- (void)perform;

确定何时完成展开segue动画

2 个答案: