旋转UIImageView里面的指南针像iOS罗盘

Question

我想在我的应用程序中包括一个指南针和标签主要引力旋转并保持其作为iOS应用程序指南针的位置。

我已经做了一些代码，并单独运行，但是当他们一起工作去疯狂。

这是我使用的代码的一部分：

的UIImageView * imgCompass; UIImageView * north;

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

locationManager = [[CLLocationManager alloc] init]; 
locationManager.delegate = self; 
locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation; 
locationManager.distanceFilter = kCLDistanceFilterNone; 
locationManager.headingFilter = 1; 
[locationManager requestWhenInUseAuthorization]; 
[locationManager startUpdatingLocation]; 
[locationManager startUpdatingHeading]; 

motionManager = [[CMMotionManager alloc] init]; 
motionManager.accelerometerUpdateInterval = 0.01; 
motionManager.gyroUpdateInterval = 0.01; 

[motionManager startAccelerometerUpdatesToQueue:[NSOperationQueue currentQueue] 
            withHandler:^(CMAccelerometerData *accelerometerData, NSError *error) { 
             if (!error) { 
              [self outputAccelertionData:accelerometerData.acceleration]; 
             } 
             else{ 
              NSLog(@"%@", error); 
             } 
            }]; 
} 

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

    // Convert Degree to Radian and move the needle 
    newRad = -newHeading.trueHeading * M_PI/180.0f; 

    [UIView animateWithDuration:0.2 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{ 
     self.viewCompass.transform = CGAffineTransformMakeRotation(newRad); 

    } completion:nil]; 
} 


- (void)outputAccelertionData:(CMAcceleration)acceleration{ 
    //UIInterfaceOrientation orientationNew; 

    // Get the current device angle 
    float xx = -acceleration.x; 
    float yy = acceleration.y; 
    float angle = atan2(yy, xx); 


    [UIView animateWithDuration:0.2 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{ 
     // Add 1.5 to the angle to keep the image constantly horizontal to the viewer. 
     [self.north setTransform:CGAffineTransformMakeRotation(angle - 1.5)]; 
    } completion:nil]; 


} 

任何想法？谢谢。我绝望......

Answer 1

我解决了。只需减去指南针的半径并将结果添加到所需的对象。在我的情况下，北，东，西，南都是UIImageView。

- (void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading { 
    self.lblGrados.text = [NSString stringWithFormat:@"%.0f°", newHeading.magneticHeading]; 

    // Convert Degree to Radian and move the needle 
    newRad = -newHeading.trueHeading * M_PI/180.0f; 

    [UIView animateWithDuration:0.6 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{ 
     compassView.transform = CGAffineTransformMakeRotation(newRad); 
    } completion:nil]; 

    [UIView animateWithDuration:0.6 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{ 
     [self.north setTransform:CGAffineTransformMakeRotation(-newRad)]; 
     [self.south setTransform:CGAffineTransformMakeRotation(-newRad)]; 
     [self.east setTransform:CGAffineTransformMakeRotation(-newRad)]; 
     [self.west setTransform:CGAffineTransformMakeRotation(-newRad)]; 
    } completion:nil]; 
}