iOS 8-UIWindow方向始终为纵向 [英] iOS 8 - UIWindow Orientation Is Always Portrait

问题描述

我正在将iOS 6应用程序更新为iOS 8(iPad)，并且我创建的所有新UIWindows始终以纵向模式显示.该应用程序最初既支持纵向也支持横向，但现在仅支持横向.

I am updating an iOS 6 app to iOS 8 (iPad), and any new UIWindows that I create are always showing up in Portrait mode. The app originally supported both the Portrait and Landscape orientations but now will only support Landscape.

我已将项目文件中支持的方向更改为横向左"和横向右".整个UI如预期那样以横向显示，但是当我创建一个新的UIWindow时，它以纵向显示.新的UIWindow框架与屏幕的框架完全匹配，因此我无法想象为什么/如何以纵向模式显示它.

I've changed the supported orientations in the project file to Landscape Left and Landscape Right. The entire UI shows up in landscape, as expected, but when I create a new UIWindow, it shows up in portrait. The new UIWindow's frame matches the screen's frame exactly, so I can't imagine why/how it is showing up in portrait mode.

以下代码是我用来创建和显示新的UIWindow(用作模式)的代码:

The following code is what I am using to create and show the new UIWindow, which acts as a modal:

var modalWindow:UIWindow = UIWindow(frame: self.view.window!.bounds)

modalWindow.backgroundColor = UIColor.blackColor().colorWithAlphaComponent(0.66)
modalWindow.hidden = false
modalWindow.windowLevel = (UIWindowLevelStatusBar + 1)

modalWindow.addSubview(customView)    

modalWindow.makeKeyAndVisible()

我已经为此苦苦挣扎了几个小时.默认情况下，UIWindow是否不应该处于横向模式，因为该应用程序仅支持横向方向?

I've been struggling with this for a few hours; shouldn't the UIWindow be in landscape mode by default since the app only supports the Landscape orientation?

对于如何解决此问题的任何建议，我将不胜感激.

I would greatly appreciate any advice on how to resolve this issue.

我刚刚创建了一个仅支持"Landscape Left"和"Landscape Right"的新测试应用程序，该问题也同样出现在这里.这是一个错误吗?我似乎无法理解为什么UIWindow在横向模式下会认为该应用程序处于纵向模式.

I just created a new test app that only supports Landscape Left and Landscape Right, and the issue occurs there as well. Is this a bug? I can't seem to understand why the UIWindow would think the app is in Portrait mode when it's in Landscape mode.

推荐答案

编辑(2015年7月2日)

此答案在iOS 8.3+和iOS 8的早期版本中均无效.我不建议任何人使用它，特别是因为不能保证它可以在将来的iOS版本中使用.

This answer breaks in iOS 8.3+ and possibly previous versions of iOS 8. I DO NOT recommend that anyone uses it, especially since it is not guaranteed to work in future iOS versions.

我的新解决方案使用UIViewController的标准presentViewController方法.我初始化UIViewController，将自定义模态View添加为UIViewController的子视图，然后使用约束定位模态View.就像魅力一样！

My new solution uses the standard presentViewController method of a UIViewController. I initialize a UIViewController, add my custom modal View as a subview of the UIViewController, and then position the modal View using constraints. Works like a charm!

原始答案

我离开了一段时间，但决定今天回到它.我最终将模式窗口旋转-90度，因为它会自动旋转90度以纵向显示.我还对模态窗口的宽度和高度进行了少量计算，以支持iOS 7和iOS8.这是我的新代码:

I left this for a while but decided to come back to it today. I ended up rotating the modal window -90 degrees since it is automatically rotated 90 degrees to be displayed in portrait. I also added a small calculation for the modal window's width and height to support both iOS 7 and iOS 8. Here is my new code:

// Get the screen size
var screenSize:CGSize = UIScreen.mainScreen().bounds.size

// Use the larger value of the width and the height since the width should be larger in Landscape
// This is needed to support iOS 7 since iOS 8 changed how the screen bounds are calculated
var widthToUse:CGFloat = (screenSize.width > screenSize.height) ? screenSize.width : screenSize.height

// Use the remaining value (width or height) as the height
var heightToUse:CGFloat = (widthToUse == screenSize.width ? screenSize.height : screenSize.width)

// Create a new modal window, which will take up the entire space of the screen
var modalWindow:UIWindow = UIWindow(frame: CGRect(x: 0, y: 0, width: widthToUse, height: heightToUse))

modalWindow.backgroundColor = UIColor.blackColor().colorWithAlphaComponent(0.66)
modalWindow.hidden = false
modalWindow.windowLevel = (UIWindowLevelStatusBar + 1)

modalWindow.addSubview(customView)    

// Create a -90 degree transform since the modal is always displayed in portrait for some reason
var newTransform:CGAffineTransform = CGAffineTransformMakeRotation(CGFloat(-M_PI / 2))

// Set the transform on the modal window
modalWindow.transform = newTransform

// Set the X and Y position of the modal window to 0
modalWindow.frame.origin.x = 0
modalWindow.frame.origin.y = 0

modalWindow.makeKeyAndVisible()

如上所述，这在iOS 7+和iOS 8+上都很好用！使用子视图时，请注意，模态的width和height值是切换的，因为它以纵向显示.因此，如果要水平居中放置子视图，请使用模式窗口的height和子视图的width而不是两个视图的width.

As stated, this works great on both iOS 7+ and iOS 8+! When working with subviews, note that the modal's width and height values are switched since it's displaying in portrait. So, if you want to center a subview horizontally, use the modal window's height and the subview's width instead of both views' width.

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