如何在iOS上检测设备的方向？

Question

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:

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

在我看来这应该工作.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,我不知道为什么.

Answer 1

真的老线程,但没有真正的解决方案.

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

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

Answer 2

如果UIViewController:

if (UIDeviceOrientationIsLandscape(self.interfaceOrientation))
{
    // 
}

如果UIView:

if (UIDeviceOrientationIsLandscape([UIApplication sharedApplication].statusBarOrientation))
{
    //
}

UIDevice.h:

#define UIDeviceOrientationIsPortrait(orientation)  ((orientation) == UIDeviceOrientationPortrait || (orientation) == UIDeviceOrientationPortraitUpsideDown)
#define UIDeviceOrientationIsLandscape(orientation) ((orientation) == UIDeviceOrientationLandscapeLeft || (orientation) == UIDeviceOrientationLandscapeRight)

更新:

将此代码添加到xxx-Prefix.pch,然后您可以在任何地方使用它:

// check device orientation
#define dDeviceOrientation [[UIDevice currentDevice] orientation]
#define isPortrait  UIDeviceOrientationIsPortrait(dDeviceOrientation)
#define isLandscape UIDeviceOrientationIsLandscape(dDeviceOrientation)
#define isFaceUp    dDeviceOrientation == UIDeviceOrientationFaceUp   ? YES : NO
#define isFaceDown  dDeviceOrientation == UIDeviceOrientationFaceDown ? YES : NO

用法:

if (isLandscape) { NSLog(@"Landscape"); }

Answer 3

对于您首先要寻找的内容,如果方向发生变化,您必须获得通知!你可以在viewDidLoad中设置This Thing

[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(OrientationDidChange:) name:UIDeviceOrientationDidChangeNotification object:nil];

每当您的设备的方向改变时,OrientationDidChange被调用,您可以按照每个方向执行任何操作

-(void)OrientationDidChange:(NSNotification*)notification
{
    UIDeviceOrientation Orientation=[[UIDevice currentDevice]orientation];

    if(Orientation==UIDeviceOrientationLandscapeLeft || Orientation==UIDeviceOrientationLandscapeRight)
    {
    }
    else if(Orientation==UIDeviceOrientationPortrait)
    {
    }
}

Answer 4

如果您想直接从加速度计使用获取设备方向[[UIDevice currentDevice] orientation].但是,如果您需要当前的应用程序方向(界面方向)使用[[UIApplication sharedApplication] statusBarOrientation].

Answer 5

UIViewController有一个interfaceOrientation属性,您可以访问该属性以查找视图控制器的当前方向.

至于你的例子,这应该工作.当你说它不起作用时,你的意思是什么？它给你的结果与你的预期结果有什么关系？

Answer 6

在Swift 3.0中

获取设备方向.

/* return current device orientation.
   This will return UIDeviceOrientationUnknown unless device orientation notifications are being generated. 
*/
UIDevice.current.orientation

从您的应用程序获取设备方向

UIApplication.shared.statusBarOrientation