Switching views using the UIAccelerometer

Hey guys, Sorry if I'm a newbie on this, I've looked around but haven't quite found out how to do it. Basically I would like to switch views using the iphone's accelerometer. For example, say if the iphone drops, the motion would trigg开发者_Python百科er it to switch to another view telling the user the phone had dropped. Any help on how to do it would be appreciated, thanks.

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The accelerometer can be read using UIAccelerometer class, which calls accelerometer values to its UIAccelerometerDelegate protocol delegate. This means:

h file:

@interface TestView: UIViewController <UIAccelerometerDelegate> {
  UIAccelerometer *accelerometer;
}

@property (nonatomic, retain) UIAccelerometer *accelerometer;

@end

in your m file:

- (void)viewDidLoad {
  [super viewDidLoad];

  self.accelerometer = [UIAccelerometer sharedAccelerometer];
  self.accelerometer.updateInterval = .1;
  self.accelerometer.delegate = self;
}

- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {     
  float aX = ABS(acceleration.x);
  float aY = ABS(acceleration.y);
  float aZ = ABS(acceleration.z);
  if(sqrt(aX*aX+aY*aY+aZ*aZ)>THRESHOLD){
     //Load new view here      
  }
}

You can choose THRESHOLD to be anything you want it to be. It implies that the length of the acceleration vector exceeds a certain value. I think this value is usually around 1 if there is no movement, and higher if there is some movement. I would recommend setting this to something like 1.5 maybe? You can try out different values yourself.

Hope this helps!