CODEWITHSUNDEEP
iphoneiosaccelerometer
Abhinav Singh
Abhinav Singh

Reputation: 8100

How to Detect Flip of iPhone?

is there a logic to detect if the user has flipped their phone like from battery side to screen side and vice versa in horizontal plane? I have tried getting raw values to determine if the device is in the horizontal position on both faces but how to detect the whole motion , could someone point me in right direction.

Upvotes: 0

Views: 1162

Answers (1)

Mick MacCallum
Mick MacCallum

Reputation: 130193

If you take a look at the UIDevice class reference, you'll see the orientation enum. Two of it's values are UIDeviceOrientationFaceDown and UIDeviceOrientationFaceUp. That being said, all you have to do is register an observer to the UIDeviceOrientationDidChangeNotification notification, and upon call you can check the devices current orientation and handle this accordingly.

[[NSNotificationCenter defaultCenter] addObserverForName:UIDeviceOrientationDidChangeNotification object:nil queue:[NSOperationQueue mainQueue] usingBlock:^(NSNotification *note) {
    UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];
    if (orientation == UIDeviceOrientationFaceDown) {
        // device facing down
    }else if (orientation == UIDeviceOrientationFaceUp) {
        // device facing up
    }else{
        // facing some other direction
    }
}];

Be sure to use the following to start generating the device notifications you'll need to observe.

[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];

If you want to get more specific information about the orientation of the device, you'll need to use the Core Motion framework to get gyro data directly. With this, you can track the exact current direction the device is facing in 3D space.

_motionManager = [CMMotionManager new];
NSOperationQueue *queue = [NSOperationQueue new];

[_motionManager setGyroUpdateInterval:1.0/20.0];
[_motionManager startGyroUpdatesToQueue:queue withHandler:^(CMGyroData *gyroData, NSError *error) {
    NSLog(@"%@",gyroData);
}];

Upvotes: 4

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