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

如果是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)

<强>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！您可以在viewDidLoad中设置This Thing，如

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

每当您的设备的方向发生变化时 OrientationDidChange 会调用您可以按照每个方向执行任何操作的位置

-(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获取设备方向，请使用[[UIDevice currentDevice] orientation]。但是，如果您需要应用程序的当前方向（界面方向），请使用[[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，这应该有效。当你说它不起作用时，你的意思是什么？它会给你带来什么结果与你期望的结果？

Answer 6

在Swift 3.0中

以获取设备方向。

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

从您的应用中获取设备方向

UIApplication.shared.statusBarOrientation

Answer 7

“UIDeviceOrientation”不满意，因为当UIViewcontroller方向固定到特定方向时，您无法获得有关设备方向的相关信息，因此正确的做法是使用的 “UIInterfaceOrientation”即可。

您可以使用“self.interfaceOrientation”从UIViewController获取方向，但是当您分解我们的代码时，您可能需要在视图控制器外进行此类测试，（自定义）查看，类别...），因此您仍然可以使用 rootviewController 访问控制器外的任何位置信息：

if (UIInterfaceOrientationIsLandscape(view.window.rootViewController.interfaceOrientation)) {
}

Answer 8

通过使用CoreMotion中的数据，无论方向锁定是否启用，都可以实现此目的。这是代码：

#import <CoreMotion/CoreMotion.h> 

    CMMotionManager *cm=[[CMMotionManager alloc] init];
    cm.deviceMotionUpdateInterval=0.2f;
    [cm startDeviceMotionUpdatesToQueue:[NSOperationQueue mainQueue]
                            withHandler:^(CMDeviceMotion *data, NSError *error) {

                            if(fabs(data.gravity.x)>fabs(data.gravity.y)){
                                    NSLog(@"LANSCAPE");
                                if(data.gravity.x>=0){
                                    NSLog(@"LEFT");
                                }
                                else{
                                    NSLog(@"RIGHT");
                                }

                        }
                        else{
                                NSLog(@"PORTRAIT");
                                if(data.gravity.y>=0){
                                    NSLog(@"DOWN");
                                }
                                else{

                                    NSLog(@"UP");
                                }

                            }

}];

Answer 9

您是否解锁了硬件锁以获取设备方向？ iPad 1的边缘有一个。

Answer 10

以下是一些使检测更容易的Swift变量：

CHANGELOG.md

Answer 11

我目前的做法：

+ (BOOL)isPortrait {
    let window = UIApplication.sharedApplication.delegate.window;
    if(window.rootViewController) {
        let orientation =
        window.rootViewController.interfaceOrientation;
        return UIInterfaceOrientationIsPortrait(orientation);
    } else {
        let orientation =
        UIApplication.sharedApplication.statusBarOrientation;
        return UIInterfaceOrientationIsPortrait(orientation);
    }
}

如果由于某种原因，没有rootViewController仍然无法安全地进行statusBarOrientation ...

Answer 12

最快捷的最佳可靠方式：

public extension UIScreen {

    public class var isPortrait: Bool {
        UIApplication.shared.delegate?.window??.rootViewController?.interfaceOrientation.isPortrait ??
                UIApplication.shared.statusBarOrientation.isPortrait
    }

    public class var isLandscape: Bool { !isPortrait }
}

Answer 13

这是我使用 Combine 的解决方案，它非常容易与 SwiftUI 或常规 Swift 对象一起使用。对于这种真正的全局对象，单例对象（静态实例）比“环境”更好。

// Singleton object to keep the interface orientation (and any other global state)
class SceneContext: ObservableObject {
    @Published var interfaceOrientation = UIInterfaceOrientation.portrait
    static let shared = SceneContext()
}

class SceneDelegate: UIResponder, UIWindowSceneDelegate {
    ...
    func windowScene(_ windowScene: UIWindowScene, didUpdate previousCoordinateSpace: UICoordinateSpace, interfaceOrientation previousInterfaceOrientation: UIInterfaceOrientation, traitCollection previousTraitCollection: UITraitCollection) {
        SceneContext.shared.interfaceOrientation = windowScene.interfaceOrientation
    }
}

    // if you want to execute some code whenever the orientation changes in SwiftUI
    someView {
        ....
    }
    .onReceive(SceneContext.shared.$interfaceOrientation) { (orientation) in
        // do something with the new orientation
    }

    // if you want to execute some code whenever the orientation changes in a regular Swift object
    let pub = SceneContext.shared.$interfaceOrientation.sink(receiveValue: { (orientation) in
            // do something with the new orientation
            ...
        })

Answer 14

使用此功能。

    func deviceOrientation() -> String! {
    let device = UIDevice.current
    if device.isGeneratingDeviceOrientationNotifications {
            device.beginGeneratingDeviceOrientationNotifications()
            var deviceOrientation: String
            let deviceOrientationRaw = device.orientation.rawValue
            switch deviceOrientationRaw {
            case 1:
                deviceOrientation = "Portrait"
            case 2:
                deviceOrientation = "Upside Down"
            case 3:
                deviceOrientation = "Landscape Right"
            case 4:
                deviceOrientation = "Landscape Left"
            case 5:
                deviceOrientation = "Camera Facing Down"
            case 6:
                deviceOrientation = "Camera Facing Up"
            default:
                deviceOrientation = "Unknown"
            }
            return deviceOrientation
        } else {
            return nil
        }
    }

如何在iOS上检测设备的方向？

14 个答案: