在Swift中，如何在启动后立即正确获取设备方向? [英] In Swift, how to get the device orientation correctly right after it's launched?

问题描述

我使用以下代码查看设备是否处于横向模式:

I use following code to see if the device is in landscape mode or not:

UIDevice.currentDevice().orientation.isLandscape.boolValue

如果我在启动应用程序之前将设备置于横向模式，那么它会起作用，而在viewDidLoad之后，我调用此代码行，它将始终返回false.

It works BUT if I put my device in landscape mode before the app is launched, and after viewDidLoad, I call this line of code, it always returns false.

如果我改用这个:

interfaceOrientation.isLandscape

它返回true，这是正确的，但是编译器显示的是interfaceOrientation was deprecated in iOS 8.0的警告.

it returns true, which is correct, but the compiler is showing a warning that interfaceOrientation was deprecated in iOS 8.0.

启动应用后立即获得设备方向的正确方法是什么?

What is the correct way to get the device orientation right after the app is launched?

推荐答案

我已经对定向进行了很多次测试，所以我总结了一些经验.

I have tested many times about orientation, so I have summed up some experience.

在所有iPhone设备中，除iPhone6s或更高版本外，唯一的接口方向是.portrait.如果以横向模式启动App，则必须更改方向.一个会收到UIDeviceOrientationDidChangeNotification.现在是获取方向的合适时间.

In all iPhone devices, except iPhone6(s) plus, the only interface orientation is .portrait. If App is launched in landscape mode, there must be a change of orientation. One will receive the UIDeviceOrientationDidChangeNotification. It's an appropriate time to get the orientation.

关于在iPhone6上横向启动时，启动后的方向将更改一次:

Regarding the launching when in landscape with iPhone6, the orientation after the launch will change once:

在使用iPhone6 plus的情况下启动时，启动后的方向从未改变:

The launching when in landscape with iPhone6 plus, after launch the orientation never changed:

使用同一应用，

因此，在应用程序更改方向之前，方向仍然像主页中一样.

So before the app does change orientation, the orientation is still like in the home page.

在viewDidLoad中，方向尚未更改，日志方向错误.

In viewDidLoad, the orientation has not changed yet, the log will be the wrong direction.

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