在app中仅更改一个UIViewController的UIInterfaceOrientation [英] Change UIInterfaceOrientation for only one UIViewController in app

问题描述

我有一个iPhone应用程序，其结构类似于导航控制器带表 - >下一个视图控制器带表 - > QLPreviewController。通过在第一个视图控制器（带导航控制器）中的表格单元格中出现新视图控制器与另一个表格，通过点击它的单元格显示QLPreviewController。

I have an iPhone app with structure like "Navigation controller with table -> next view controller with table -> QLPreviewController". By tap in cell of table in first view controller(with navigation controller) appears new view controller with another table, by tap in cell of it shows QLPreviewController.

例如：在第一个表中有组，在第二个表中 - 所选组的文档和用于预览所选文档的QLPreviewController。

For example: In first table there are Groups, in second table - Documents of selected Group, and QLPreviewController for previewing selected Document.

我的应用程序中的每个ViewController必须仅以纵向（非上部）方向显示，但QLViewController也必须支持横向（左右）。

Every ViewController in my app must to appear only in Portrait(not upside) orientation, but QLViewController must also support Landscape(left and right).

我在QLPreviewController出现之前将标志canRotate设置为YES。在AppDelegate中如果 canRotate == YES 我为任何Orientation返回YES，以旋转QLPreviewController。方法previewControllerWillDismiss中的QLPreviewControllerDelegate：（QLPreviewController *）控制器设置标志canRotate返回NO。但是如果在QLPreviewController解除之前方向是Landscape，那么我的所有ViewController都会保持横向方向...

I'm setting flag canRotate to YES before QLPreviewController appear. In AppDelegate if canRotate == YES I'm return YES for any Orientation, to rotate QLPreviewController. QLPreviewControllerDelegate in method previewControllerWillDismiss:(QLPreviewController *)controller sets flag canRotate back to NO. But if orientation was Landscape before QLPreviewController dismiss, all of my ViewControllers stay in Landscape orientation...

如何在WillDismiss方法中将ViewController旋转回Portrait方向？

How can I rotate ViewController back to Portrait orientation in WillDismiss method?

推荐答案

我在申请表上做的事情（或多或少与你的一样）是：

What I did on my application (its more or less like yours) was:

1）为两个屏幕设置shouldRotate 是。

1) Set shouldRotate Yes for both screens.

2）对于第一个视图，设置以下掩码：

2) For the first view set the following mask:

return UIInterfaceOrientationMaskPortrait

对于第二个View put：

For the second View put:

return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscape;

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