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我试图在 iOS 中获取海拔值和磁场值。我一直在谷歌上搜索这些主题很长时间，但我找不到任何可以正常工作的东西。

a）当我谈论仰角值时，我想在我向上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，以使其更容易。我一直在尝试这样，但它不起作用：

。H

#import <CoreMotion/CoreMotion.h>

@property (nonatomic, retain) CMMotionManager *motionManager;

.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，我想了解影响我手机精度的设备、磁铁、铁等的影响。* 我得到的所有值都不正确（在一种 NSTimer 中）：

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

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1 回答 1

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最后，我得到了这两个问题的答案。这是我正在使用的代码。希望它可以帮助某人。

磁场：.h

@property (nonatomic, retain) CLLocationManager *locationManager;

.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;

.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。

于 2013-03-08T12:05:40.823 回答