ios - 为什么不调用 UIViewControllerTransitioningDelegate 的 presentationControllerForPresentedViewController 方法？

Question

我想使用自定义 UIPresentationController。对于它，当我想显示新场景时，我调用此代码

UIViewController *cv = [[...]];

cv.transitionManager=[[MyTransition alloc] init];
cv.transitioningDelegate=actionSheet.transitionManager;
cv.modalTransitionStyle = UIModalPresentationCustom;

[self presentViewController:cv animated:YES completion:^{

}];

我的过渡经理有方法:

#pragma mark - UIViewControllerTransitioningDelegate

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

- (id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed{
    return self;
}

- (id <UIViewControllerInteractiveTransitioning>)interactionControllerForPresentation:(id <UIViewControllerAnimatedTransitioning>)animator{
    return  nil;
}

- (id <UIViewControllerInteractiveTransitioning>)interactionControllerForDismissal:(id <UIViewControllerAnimatedTransitioning>)animator{
    return self;
}


- (UIPresentationController *)presentationControllerForPresentedViewController:(UIViewController *)presented presentingViewController:(UIViewController *)presenting sourceViewController:(UIViewController *)source {
    MyPresentationController *presentationController = [[MyPresentationController alloc] initWithPresentedViewController:presented presentingViewController:presenting];
    return presentationController;
}

但是方法 presentationControllerForPresentedViewController 没有调用!

为什么？

Answer 1

仅当您使用 UIModalPresentationCustom 呈现样式呈现 View Controller 时才会调用它