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    <p>If you take a look at the <a href="https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIDevice_Class/Reference/UIDevice.html#//apple_ref/doc/c_ref/UIDeviceOrientation" rel="nofollow">UIDevice class reference</a>, you'll see the orientation enum. Two of it's values are <code>UIDeviceOrientationFaceDown</code> and <code>UIDeviceOrientationFaceUp</code>. That being said, all you have to do is register an observer to the <code>UIDeviceOrientationDidChangeNotification</code> notification, and upon call you can check the devices current orientation and handle this accordingly.</p> <pre><code>[[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 } }]; </code></pre> <p>Be sure to use the following to start generating the device notifications you'll need to observe.</p> <pre><code>[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications]; </code></pre> <p>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.</p> <pre><code>_motionManager = [CMMotionManager new]; NSOperationQueue *queue = [NSOperationQueue new]; [_motionManager setGyroUpdateInterval:1.0/20.0]; [_motionManager startGyroUpdatesToQueue:queue withHandler:^(CMGyroData *gyroData, NSError *error) { NSLog(@"%@",gyroData); }]; </code></pre>
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    1. POHow to Detect Flip of iPhone?
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    1. USMick MacCallum
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    1. COthanks for the reply, i had achieved this detection though raw values previously and i have mentioned this in my question too the problem is to detect the whole motion of flipping from isFaceUp to isFaceDown
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    2. COokey that should be more accurate but i still don't see how it will detect the motion , it detects two end positions very accurately but i am not sure how will i know my user has flipped his device
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    3. COthe problem is not of accuracy to detect the end position but the logic to detect this whole motion
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