How to detect orientation, if screen is locked in portrait mode?

Question

My application works in both orientation(portrait and landscape) but one of the screen is locked in portrait mode. But I have to set one value in Rotation variable for that particular screen. But I did not find orientation. So I want to find orientation. I'm using this below code for lock my screen in portrait mode and it will work.

- (UIInterfaceOrientationMask) supportedInterfaceOrientations {
    [super supportedInterfaceOrientations];
    return UIInterfaceOrientationMaskPortrait;
}

I'm using this below method to detect orientation but this will not called.

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
    UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
    if (orientation == UIInterfaceOrientationPortrait || orientation == UIInterfaceOrientationPortraitUpsideDown)
    {
        NSLog(@"UIInterfaceOrientationPortrait");
    }
    else
    {
        NSLog(@"UIInterfaceOrientationland");

    }
}

You can see reference. http://stackoverflow.com/questions/9122149/detecting-ios-uidevice-orientation — Keyur Hirani, Aug 20 '16 at 06:11

score 1 · Answer 1 · edited Aug 08 '23 at 07:35

You can detect orientation, if screen is locked in portrait mode. The easy way is "CoreMotion". The code snippet is below.

1-) Firstly, you should add CoreMotion freamework to Build Settings

2-) import CoreMotion freamework

#import <CoreMotion/CoreMotion.h>

3-) added property just like below.

    @interface BaseGeneralViewController (){
    UIInterfaceOrientation orientationLast, orientationAfterProcess;
    CMMotionManager *motionManager;
    UIInterfaceOrientation orientationNew;

}

4-) we are created method to initialize

 - (void)initializeMotionManager{
    motionManager = [[CMMotionManager alloc] init];
    motionManager.accelerometerUpdateInterval = .2;
    motionManager.gyroUpdateInterval = .2;
    
    [motionManager startAccelerometerUpdatesToQueue:[NSOperationQueue currentQueue]
                                        withHandler:^(CMAccelerometerData  *accelerometerData, NSError *error) {
                                            if (!error) {
                                                [self outputAccelerationData:accelerometerData.acceleration];
                                            }
                                            else{
                                                NSLog(@"%@", error);
                                            }
                                        }];
}

5-) declare outputAccelerationData method

    - (void)outputAccelerationData:(CMAcceleration)acceleration{
    
    if (acceleration.x >= 0.75 && orientationLast != UIInterfaceOrientationLandscapeLeft) {
        orientationNew = UIInterfaceOrientationLandscapeLeft;
        [self callQRCodePayment:UIDeviceOrientationLandscapeRight];
    }
    else if (acceleration.x <= -0.75  && orientationLast != UIInterfaceOrientationLandscapeRight) {
        orientationNew = UIInterfaceOrientationLandscapeRight;
        [self callQRCodePayment:UIDeviceOrientationLandscapeLeft];
    }
    else if (acceleration.y <= -0.75) {
        //orientationNew = UIInterfaceOrientationPortrait;
        //NSLog(@"Portrait");
    }
    else if (acceleration.y >= 0.75) {
        //orientationNew = UIInterfaceOrientationPortraitUpsideDown;
    }
    else {
        // Consider same as last time
        return;
    }
    
    if (orientationNew == orientationLast)
        return;
    
    orientationLast = orientationNew;
}

6-) call initialize method in viewDidload

    - (void)viewDidLoad
{
    [super viewDidLoad];
    [self initializeMotionManager];
}

you can see detail postchange Oriantation

score -1 · Answer 2 · answered Aug 20 '16 at 06:14

-1

here are methods to detect orientation UIDeviceOrientationIsLandscape and UIDeviceOrientationIsPortrait

if (UIDeviceOrientationIsLandscape([UIDevice currentDevice].orientation))
{
     // code here for landscape orientation      
}

// And

if (UIDeviceOrientationIsPortrait([UIDevice currentDevice].orientation))
 {
    // code here for Portrait orientation       
 }

answered Aug 20 '16 at 06:14

vaibhav

4,038
1
21
51

so what will you do after find the orientation after-all you locked the device orientation in portrait mode so you well knew about it now go ahead and set the variables value accordingly .. – vaibhav Aug 20 '16 at 10:44
Yeah I know that. But my `didRotateFromInterfaceOrientation` method not called because my screen is locked in Portrait mode. @vaibhav – Yogendra Patel Aug 22 '16 at 03:50
`didRotateFromInterfaceOrientation` method called when user rotate screen and you locked it earlier now you can set the value you want to set .. – vaibhav Aug 22 '16 at 06:36

How to detect orientation, if screen is locked in portrait mode?

2 Answers2