Xcode iPhone Accelerometer Image

Question

I am French, so excuse me for my English. Therefore, I use the accelerometer, but in my code the accelerometer works for viewing, not for the image. I want to use this accelerometer for an image instead of a view. How can i do this? Here is the code:

#define CONST_fps 100.
#define CONST_map_shift 0.01
#define kFilteringFactor 0.1
UIAccelerationValue rollingX, rollingY, rollingZ;

@implementation MapViewRotationViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    // accelerometer settings
    [[UIAccelerometer sharedAccelerometer] setDelegate:self];
    [[UIAccelerometer sharedAccelerometer] setUpdateInterval:(1.0 / CONST_fps)];
}

- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration
{
    rollingX = (acceleration.x * kFilteringFactor) + (rollingX * (1.0 - kFilteringFactor));

    rollingY = (acceleration.y * kFilteringFactor) + (rollingY * (1.0 - kFilteringFactor));

    rollingZ = (acceleration.z * kFilteringFactor) + (rollingZ * (1.0 - kFilteringFactor));

    float accelX = acceleration.x - rollingX;
    float accelY = acceleration.y - rollingY;
    float accelZ = acceleration.z - rollingZ;

    static CGFloat ZZ = 0.;
    CGFloat z = (atan2(rollingX, rollingY) + M_PI);

    if (fabsf(ZZ - z) > CONST_map_shift)
    {
        viewToRotate.layer.transform = CATransform3DMakeRotation(ZZ=z, 0., 0., 1.);
    }
}

@end

Answer 1

You do not need to look like a callback; instead, you can choose any class that matches the UIAccelerometerDelegate protocol . Just declare your class in the header file as

@interface MyClass : NSObject <UIAccelerometerDelegate> {
  // my members
}

In MyClass.m you must implement a method

- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration {
  // do what you like
}

iOS 3.x, CoreMotion API. . iOS/ .