IOS : 내 응용 프로그램에서 나침반

Question

내가 내 응용 프로그램에서 나침반을 삽입하는 코드가 있습니다 수정

- (void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading{ 

    // Convert Degree to Radian and move the needle 
    float oldRad = -manager.heading.trueHeading * M_PI/180.0f; 
    float newRad = -newHeading.trueHeading * M_PI/180.0f; 
    CABasicAnimation *theAnimation; 
    theAnimation=[CABasicAnimation animationWithKeyPath:@"transform.rotation"]; 
    theAnimation.fromValue = [NSNumber numberWithFloat:oldRad]; 
    theAnimation.toValue=[NSNumber numberWithFloat:newRad]; 
    theAnimation.duration = 0.5f; 
    [compassImage.layer addAnimation:theAnimation forKey:@"animateMyRotation"]; 
    compassImage.transform = CGAffineTransformMakeRotation(newRad); 

} 

가 잘 작동하지만, 때로는 그 나침반 이미지를 일을하고 뻗어 보인다 ... 내가 돈 ' 문제가 뭔지 알아. 도와 주시겠습니까?

Answer 1

//Try this 

- (void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading 
{ 
    //[manager stopUpdatingHeading]; 

    double rotation = newHeading.magneticHeading * 3.14159/180; 

    [_compass_image setTransform:CGAffineTransformMakeRotation(-rotation)]; 
}