如何在iOS上检测设备的方向？ [英] How Do I detect the orientation of the device on iOS?

问题描述

我有一个关于如何在iOS上检测设备方向的问题。我不需要接收更改通知，只需要接收当前方向。这似乎是一个相当简单的问题，但我无法绕过它。以下是我到目前为止所做的事情：

I have a question on how to detect the device orientation on iOS. I don't need to receive change notifications, just the current orientation itself. This seems to be a rather simple question, but I haven't been able to wrap my head around it. Below is what I have done so far:

UIDevice *myDevice = [UIDevice currentDevice] ;
[myDevice beginGeneratingDeviceOrientationNotifications];
UIDeviceOrientation deviceOrientation = myDevice.orientation;
BOOL isCurrentlyLandscapeView = UIDeviceOrientationIsLandscape(deviceOrientation);
[myDevice endGeneratingDeviceOrientationNotifications];

在我看来这应该有效。我启用设备接收设备方向通知，然后询问它的方向，但它不起作用，我不知道原因。

In my mind this should work. I enable the device to receive device orientation notices, then ask for what orientation it is in, but then it is not working and I don't know why.

推荐答案

真的是老线程，但没有真正的解决方案。

Really old thread, but no real solution.

我有同样的问题，但发现获得UIDeviceOrientation并不总是一致的，所以改为使用：

I Had the same problem, but found out that getting The UIDeviceOrientation isn't always consistent, so instead use this:

UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;

if(orientation == 0) //Default orientation 
    //UI is in Default (Portrait) -- this is really a just a failsafe. 
else if(orientation == UIInterfaceOrientationPortrait)
    //Do something if the orientation is in Portrait
else if(orientation == UIInterfaceOrientationLandscapeLeft)
    // Do something if Left
else if(orientation == UIInterfaceOrientationLandscapeRight)
    //Do something if right

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