swift的app
默认好像是支持横屏的
但是当iPhone屏幕有旋转的话，就会变成对应的横屏，
此处不想要横屏，要去禁止横屏，只支持默认的竖屏。
可以看到，默认设置的支持的模式：
iPhone有三种
iPad有4种
swift 禁止竖屏
swift 禁止横屏
搜：
supportedInterfaceOrientations
UIViewController Class Reference
“Handling View Rotations
As of iOS 8, all rotation-related methods are deprecated. Instead, rotations are treated as a change in the size of the view controller’s view and are therefore reported using the viewWillTransitionToSize:withTransitionCoordinator: method. When the interface orientation changes, UIKit calls this method on the window’s root view controller. That view controller then notifies its child view controllers, propagating the message throughout the view controller hierarchy.
In iOS 6 and iOS 7, your app supports the interface orientations defined in your app’s Info.plist file. A view controller can override the supportedInterfaceOrientations method to limit the list of supported orientations. Typically, the system calls this method only on the root view controller of the window or a view controller presented to fill the entire screen; child view controllers use the portion of the window provided for them by their parent view controller and no longer participate directly in decisions about what rotations are supported. The intersection of the app’s orientation mask and the view controller’s orientation mask is used to determine which orientations a view controller can be rotated into.
You can override the preferredInterfaceOrientationForPresentation for a view controller that is intended to be presented full screen in a specific orientation.
When a rotation occurs for a visible view controller, the willRotateToInterfaceOrientation:duration:, willAnimateRotationToInterfaceOrientation:duration:, and didRotateFromInterfaceOrientation:methods are called during the rotation. The viewWillLayoutSubviews method is also called after the view is resized and positioned by its parent. If a view controller is not visible when an orientation change occurs, then the rotation methods are never called. However, the viewWillLayoutSubviews method is called when the view becomes visible. Your implementation of this method can call the statusBarOrientation method to determine the device orientation.
NOTE
At launch time, apps should always set up their interface in a portrait orientation. After the application:didFinishLaunchingWithOptions: method returns, the app uses the view controller rotation mechanism described above to rotate the views to the appropriate orientation prior to showing the window.”
ios8 screen rotate
ios8 screen orientation
objective c – iOS 9 supportedInterfaceOrientations not working – Stack Overflow
先去info.plist中改为：
再去项目设置中看看
果然也是只支持竖屏，其他的不支持了：
然后去试试效果，看看是否还会屏幕旋转时变横屏
再去iPhone真机试试旋转效果
就可以了：
旋转屏幕后，始终都保持（Home键在下面的）Portrait模式
另外，也看到，实际上Info.plist中是xml的key，去掉了其他几个模式：
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