Question

我试图获取iOS中的高程值和磁场值。我一直在谷歌搜索这些主题很长时间，但我找不到任何正常工作的东西。

a）当我在谈论高程值时，我希望在移动我的手机顶部时获得以度为单位的角度。我附上了一张图片，以便更轻松。我一直在尝试，但它不起作用：

·H

#import <CoreMotion/CoreMotion.h>

@property (nonatomic, retain) CMMotionManager *motionManager;

的.m

self.motionManager = [[CMMotionManager alloc] init];
[self.motionManager startMagnetometerUpdates];
NSOperationQueue *myQueue = [[NSOperationQueue alloc] init];
[self.motionManager startDeviceMotionUpdatesToQueue:myQueue withHandler:^(CMDeviceMotion *motion, NSError *error){
    float degrees = (motion.attitude.roll*180) / M_PI;
    NSLog(@"Value of elevation is: %f", degrees);
}];

b）关于磁场，我希望受到影响我的手机精度的设备，磁铁，铁等的影响。 *通过此解决方案（在一种NSTimer中），我获得的所有值都不正确：

NSLog(@"magnetometer data -> x: %f", self.motionManager.magnetometerData.magneticField.x);
NSLog(@"magnetometer data -> y: %f", self.motionManager.magnetometerData.magneticField.y);
NSLog(@"magnetometer data -> z: %f", self.motionManager.magnetometerData.magneticField.z);

float magneticField = sqrtf( powf(self.motionManager.magnetometerData.magneticField.x, 2) 
+ powf(self.motionManager.magnetometerData.magneticField.y, 2) + 
powf(self.motionManager.magnetometerData.magneticField.z, 2) );

NSLog(@"magneticField value: %@", magneticField.text);

任何想法如何弄清楚....谢谢

Answer 1

最后，我得到了这两个问题的答案。这是我正在使用它的代码。希望它可以帮助某人。

磁感应强度： .H

@property (nonatomic, retain) CLLocationManager *locationManager;

的.m

@synthesize locationManager;

- (void)viewDidLoad
{
[super viewDidLoad];

// Starting compass setup
if(locationManager == nil)
    locationManager = [[CLLocationManager alloc] init];
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
locationManager.delegate = self;

//Start the compass updates.
if (CLLocationManager.headingAvailable) {
    [locationManager startUpdatingHeading];
    [locationManager startUpdatingLocation];
}
else {
    NSLog(@"No Heading Available: ");
    UIAlertView *noCompassAlert = [[UIAlertView alloc] initWithTitle:@"No Compass!" message:@"This device does not have the ability to measure magnetic fields." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [noCompassAlert show];
}
}

-(void)locationManager:(CLLocationManager *) manager didUpdateHeading:(CLHeading *)newHeading
{
NSLog(@"Magnetic value: %@", [[NSString stringWithFormat:@"%.1f", sqrt(newHeading.x*newHeading.x + newHeading.y*newHeading.y + newHeading.z*newHeading.z)] stringByAppendingFormat:@" µT"]);
}

海拔： .H

@property (nonatomic, retain) CMMotionManager *motionManager;

的.m

@synthesize motionManager;

- (void)viewDidLoad
{
[super viewDidLoad];
// Initializating MotionManager Object    
motionManager = [[CMMotionManager alloc] init];
motionManager.showsDeviceMovementDisplay = YES;
motionManager.deviceMotionUpdateInterval = 20.0/60.0;

// Getting Elevation Value
CMDeviceMotionHandler  motionHandler = ^ (CMDeviceMotion *motion, NSError *error) {
    CMAttitude *a = motionManager.deviceMotion.attitude;
    NSLog(@"Elevation value, %@:", [[NSString stringWithFormat:@"%.0f", a.pitch*180/M_PI] stringByAppendingFormat:@"˚"]);
};
[motionManager startDeviceMotionUpdatesUsingReferenceFrame:CMAttitudeReferenceFrameXTrueNorthZVertical toQueue:[NSOperationQueue currentQueue] withHandler:motionHandler];
}

干杯。

如何在iOS中获得高程和磁场

1 个答案: