iphone中的UIDeviceOrientationFaceDown

Question

我想检测UIDeviceOrientationFaceDown.我怎样才能做到这一点？？？实际上我想在我的iphone面朝下平面时执行一些操作.这怎么可能？？？请帮助我这样做.

我有这个代码,但不知道在何处以及如何应用此代码

 [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];

 BOOL getOrientationUpdates = [[UIDevice currentDevice] isGeneratingDeviceOrientationNotifications];
   NSLog(@"will receive orientation notifications: %@", getOrientationUpdates?@"YES":@"NO");

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

如果有任何教程,请建议我

在此先感谢,非常欢迎您的宝贵帮助和建议.

Answer 1

您可以通过检测iPhone的ProximityState来实现此目的.使用[UIDevice currentDevice]单例,设置proximityMonitoringEnabled为YES.您可以通过proximityState属性访问邻近信息.

[[UIDevice currentDevice]proximityState];

iPhone有一个传感器在通话过程中关闭屏幕,AFAIK是一个红外传感器.你可以访问它.

编辑:您也可以使用以下代码完成它.UIDeviceOrientationFaceDown The device is held parallel to the ground with the screen facing downwards.(无论是否触摸任何物体)如果您想知道iPhone是否触摸了物体,请检测设备的接近状态.

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


    -(void)detectOrientation;{

            switch ([[UIDevice currentDevice] orientation]) {
                case UIDeviceOrientationPortrait:
                {
                    NSLog(@"portrait");
                }
                    break;
                case UIDeviceOrientationPortraitUpsideDown:
                {
                    NSLog(@"portraitUpSideDown");
                }
                    break;
                case UIDeviceOrientationLandscapeLeft:
                {
                    NSLog(@"landscapeLeft");
                }
                    break;
                case UIDeviceOrientationLandscapeRight:
                {
                    NSLog(@"landscapeRight");
                }
                break;
               case UIDeviceOrientationFaceDown:
               {
                    NSLog(@"facedown!!");
                }
                 break;

            default:
                break;
        }
    } 

}

编辑:回答评论中的问题.在viewDidLoad中添加此行

[UIDevice currentDevice].proximityMonitoringEnabled = YES;
[[NSNotificationCenter defaultCenter] removeObserver:self];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleProximityChangeNotification:) name:UIDeviceProximityStateDidChangeNotification object:nil];

然后写一个方法

-(void)handleProximityChangeNotification{
     if([[UIDevice currentDevice]proximityState]){
        NSLog(@"...");
    }
}