iOS 6:旋转后忽略父模态的modalPresentationStyle

Question

使用iOS6的iPad,我们有这个错误,即模态视图控制器将扩展到全屏,即使它被告知使用"表单"演示样式.但是,只有当有两个模态,一个父模型及其子模式时,才会发生这种情况.

这就是第一个模态的创建和呈现方式:

UINavigationController *navigationController = [[[UINavigationController alloc] initWithRootViewController:controller] autorelease];
navigationController.modalPresentationStyle = UIModalPresentationFormSheet;
[parentController presentModalViewController:navigationController animated:YES];
// parentController is my application's root controller

这是创建和呈现子模态的方式:

UINavigationController *navigationController = [[[UINavigationController alloc] initWithRootViewController:controller] autorelease];
navigationController.modalPresentationStyle = UIModalPresentationFormSheet;
[parentController presentModalViewController:navigationController animated:YES];
// parentController is the navigationController from above

因此,当从横向旋转到纵向时,即使我们旋转回横向,父模式也会扩展到全屏并保持这种状态.

当我们拥有父模态本身(没有子模态)时,它按预期工作,即它保持在表单样式中.

请注意,这只发生在iOS6(设备和模拟器)上,并且不会发生在iOS 5(模拟器上,并报告由测试人员工作).

到目前为止,我已经尝试了以下但没有成功:

• 设置wantsFullScreenLayout为NO
• 强迫wantsFullScreenLayout总是NO通过覆盖它来返回
• 在导航控制器中确定我的控制器也指定 UIModalPresentationFormSheet
• 实施 preferredInterfaceOrientationForPresentation
• 升级到iOS 6.0.1

谢谢!

---

更新:所以,我调整了Apple开发者论坛(https://devforums.apple.com/message/748486#748486)的响应,以便它可以与多个嵌套模式一起使用.

- (BOOL) needNestedModalHack {
    return [UIDevice currentDevice].systemVersion.floatValue >= 6;
}

- (void) willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
                                          duration:(NSTimeInterval)duration {

    // We are the top modal, make to sure that parent modals use our size
    if (self.needNestedModalHack && self.presentedViewController == nil && self.presentingViewController) {
        for (UIViewController* parent = self.presentingViewController;
             parent.presentingViewController;
             parent = parent.presentingViewController) {
            parent.view.superview.frame = parent.presentedViewController.view.superview.frame;
        }
    }

    [super willAnimateRotationToInterfaceOrientation:toInterfaceOrientation duration:duration];
}

- (void) willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
                                 duration:(NSTimeInterval)duration {
    // We are the top modal, make to sure that parent modals are hidden during transition
    if (self.needNestedModalHack && self.presentedViewController == nil && self.presentingViewController) {
        for (UIViewController* parent = self.presentingViewController;
             parent.presentingViewController;
             parent = parent.presentingViewController) {
            parent.view.superview.hidden = YES;
        }
    }

    [super willRotateToInterfaceOrientation:toInterfaceOrientation duration:duration];
}

- (void) didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation {
    // We are the top modal, make to sure that parent modals are shown after animation
    if (self.needNestedModalHack && self.presentedViewController == nil && self.presentingViewController) {
        for (UIViewController* parent = self.presentingViewController;
             parent.presentingViewController;
             parent = parent.presentingViewController) {
            parent.view.superview.hidden = NO;
        }
    }

    [super didRotateFromInterfaceOrientation:fromInterfaceOrientation];
}

Answer 1

不确定这是否应该被视为一个错误,我很好奇iOS 7将带来什​​么,但目前这个问题的解决方法是将modalPresentationStyle设置为子视图控制器的UIModalPresentationCurrentContext.

Set modalPresentationStyle = UIModalPresentationCurrentContext

这使得孩子仍然可以作为FormSheet呈现,但是防止父母在轮换时调整大小到全屏.

短剑

Answer 2

我在这里看到两个问题。

1）在iOS 6中，该方法presentModalViewController:animated:已被弃用，请尝试使用presentViewController:animated:completion: （尽管这可能没有帮助，但您仍然可能想要这样做）

2) 在 iOS 6 中，容器控制器（例如UINavigationController）以某种方式出现，不会向其子级重新发送自动旋转消息。尝试子类化UINavigationController并重新定义相应的自动旋转方法以发送给所有子级。这可能会有所帮助。