Question

我想从View Controller＆＃34; A＆＃34;，第二个ViewController＆＃34; B＆＃34; （带导航栏）应显示第三个模态ViewController＆＃34; C＆＃34;，显示倒计时并自行解散，最终显示＆＃34; B＆＃34;。

我想＆＃34; C＆＃34;以模态呈现，没有＆＃34; B＆＃34;被人看到，当它被解雇时，＆＃34; B＆＃34;应该已经在那里了。

我一直在看这篇文章：

但是因为我需要＆＃34; B＆＃34;被推（不是模态）我不能使用UIModalPresentationCurrentContext

我也试过这样做：How to push two view controllers but animate transition only for the second one?

这几乎是我想要的，但我喜欢＆＃34; C＆＃34;以模态样式呈现，例如封面垂直。

Answer 1

我最终最终与这两个人混在一起：

How to push two view controllers but animate transition only for the second one?

NSMutableArray *controllers = [self.navigationController.viewControllers mutableCopy];
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];

MyCViewController *vcC = [storyboard instantiateViewControllerWithIdentifier:IDENTIFIER_VC];
MyBViewController *vcB = [storyboard instantiateViewControllerWithIdentifier:IDENTIFIER_VC];

[controllers addObject:vcC];
[controllers addObject:vcB];

self.navigationController.delegate = vcB;
[self.navigationController setViewControllers:controllers animated:YES];

https://www.objc.io/issues/5-ios7/view-controller-transitions/

在vcB中：

    -(id<UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController animationControllerForOperation:(UINavigationControllerOperation)operation fromViewController:(UIViewController *)fromVC toViewController:(UIViewController *)toVC
    {
        if (operation == UINavigationControllerOperationPush || operation == UINavigationControllerOperationPop) {
            MyAnimator *animator = [[MyAnimator alloc] init];
            animator.presenting = (operation == UINavigationControllerOperationPush);
            return animator;
        }
        return nil;
    }

在MyAnimator.m中：

-(NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext
{
    return 0.4;
}

-(void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{
    UIViewController *fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];

    [[transitionContext containerView] addSubview:toViewController.view];

    CGRect currentFrame = toViewController.view.frame;
    CGRect toFrameInitial = self.presenting ? CGRectOffset(currentFrame, 0, CGRectGetHeight(currentFrame)) : CGRectOffset(currentFrame, 0, -CGRectGetHeight(currentFrame));
    CGRect fromFrameFinal = self.presenting ? CGRectOffset(currentFrame, 0, -CGRectGetHeight(currentFrame)) : CGRectOffset(currentFrame, 0,   CGRectGetHeight(currentFrame));

    toViewController.view.frame = toFrameInitial;
    [UIView animateWithDuration:[self    transitionDuration:transitionContext] animations:^{
        toViewController.view.frame = currentFrame;
        fromViewController.view.frame = fromFrameFinal;
    } completion:^(BOOL finished) {
        [transitionContext completeTransition:![transitionContext transitionWasCancelled]];
    }];
}

提供2个viewcontrollers，但只有一个转换

1 个答案: