How Do I detect the orientation of the device on i

Question

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];

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.

Answer 1

UIViewController has an interfaceOrientation property that you can access to find out the current orientation of a view controller.

As for your example, that should work. When you say it isn't working, what do you mean? What results does it give you versus what you expected?

Answer 2

Here is some Swift variables to make detection easier:

let LANDSCAPE_RIGHT: Bool = UIDevice.currentDevice().orientation == UIDeviceOrientation.LandscapeRight
let LANDSCAPE_LEFT: Bool = UIDevice.currentDevice().orientation == UIDeviceOrientation.LandscapeLeft
let LANDSCAPE: Bool = LANDSCAPE_LEFT || LANDSCAPE_RIGHT
let PORTRAIT_NORMAL: Bool = UIDevice.currentDevice().orientation == UIDeviceOrientation.Portrait
let PORTRAIT_REVERSE: Bool = UIDevice.currentDevice().orientation == UIDeviceOrientation.PortraitUpsideDown
let PORTRAIT: Bool = PORTRAIT_REVERSE || PORTRAIT_NORMAL

Answer 3

If you want to get device orientation directly from accelerometer use [[UIDevice currentDevice] orientation]. But if you need current orientation of your application(interface orientation) use [[UIApplication sharedApplication] statusBarOrientation].

Answer 4

Wasn't satisfied by "UIDeviceOrientation" because when a UIViewcontroller orientation is fixed to a specific orientation you don't get a pertinent information with the device orientation, so the right thing to do is using "UIInterfaceOrientation".

You can get the orientation from the UIViewController with a "self.interfaceOrientation", but when you are factorizing our code, you might need to do this kind of test outside a view controller, (custom view, a category…), so you still can access the information anywhere outside the controller by using the rootviewController:

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

Answer 5

There's a way to achieve this whether the orientation lock is enabled or not by using data from CoreMotion. This is the code:

#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 6

In Swift 3.0

to get device orientation.

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

to get device orientation from your app

UIApplication.shared.statusBarOrientation