ios - 如何将 StatusBar 样式更新为自定义转换的一部分

Question

我正在使用 iOS 7 UIviewControllerAnimatedTransitioning 协议(protocol)来呈现带有自定义动画的模态 ViewController。动画工作正常，但是，我希望新呈现的 ViewController 具有与呈现的 VC 不同的状态栏样式。

我看到的是 -(UIStatusBarStyle)preferredStatusBarStyle 在 PRESENTING ViewController 上被调用(实际上是几次)，而从未在新呈现的 上被调用 View Controller 。如果我删除自定义动画，状态栏的所有内容都会按我预期的方式工作。

我需要在我的 animateTransition 函数中做一些特别的事情来更新 Root View Controller 或其他什么吗？我尝试使用 [UIApplication sharedApplication] setStatusBarStyle 手动设置 statusBar，但它不起作用(我想是因为我使用的是基于 ios 7 View Controller 的状态栏样式)。

这是我的 animateTransition 代码:

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{
    UICollectionViewCell *activeCell;
    if ([self.collectionView.visibleCells containsObject:self.cellForActiveIdeaVC]) {
        activeCell = self.cellForActiveIdeaVC;
    }

    UIView *container = transitionContext.containerView;
    UIViewController *fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    UIViewController *toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    UIView *fromView = fromVC.view;
    UIView *toView = toVC.view;

    CGRect beginFrame;
    if (activeCell) {
        beginFrame = [container convertRect:activeCell.bounds fromView:activeCell];
    } else {
        beginFrame = CGRectMake(container.width / 2, container.height / 2, 0, 0);
    }

    CGRect endFrame = [transitionContext initialFrameForViewController:fromVC];

    UIView *move = nil;
    if (toVC.isBeingPresented) {
        toView.frame = endFrame;
        move = [toView snapshotViewAfterScreenUpdates:YES];
        move.frame = beginFrame;
    } else {
        if (activeCell) {
            move = [activeCell snapshotViewAfterScreenUpdates:YES];
        } else {
            move = [fromView snapshotViewAfterScreenUpdates:YES];
        }
        move.frame = fromView.frame;
        [fromView removeFromSuperview];
    }
    [container addSubview:move];

    [UIView animateWithDuration:.5
                          delay:0
         usingSpringWithDamping:700
          initialSpringVelocity:15
                        options:0
                     animations:^{
                         move.frame = toVC.isBeingPresented ?  endFrame : beginFrame;
                     }
                     completion:^(BOOL finished) {
                         [move removeFromSuperview];

                         if (toVC.isBeingPresented) {
                             toView.frame = endFrame;
                             [container addSubview:toView];
                         } else {
                             if (self.cellForActiveIdeaVC) {
                                 self.cellForActiveIdeaVC = nil;
                             }
                         }

                         [transitionContext completeTransition:YES];
                     }];
}

非常感谢任何指点!

Answer 1

使用 iOS 7 自定义过渡，可以呈现非全屏的 View Controller ，因此不会影响状态栏的外观。您必须明确告诉 iOS 您的自定义呈现 View Controller 实际上将控制状态栏的外观。

UIViewController *controllerToPresent = [...]
controllerToPresent.modalPresentationStyle = UIModalPresentationStyleCustom;
controllerToPresent.modalPresentationCapturesStatusBarAppearance = YES;

[self presentViewController:controllerToPresent animated:YES completion:nil];

有一些 more information here .希望对您有所帮助!