如何在iOS中获取高程和磁场
如何在iOS中获取高程和磁场
提问于 2013-03-07 22:26:21
我正在尝试获取iOS中的高程值和磁场值。我已经用谷歌搜索了很长一段时间，但我找不到任何可以正常工作的东西。
a)当我谈到仰角值时，我想要在我将手机顶部向上移动时获得角度。我附上了一张图片，让它更容易。我已经试过了，但是不起作用：
.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，我想得到影响我的手机准确性的设备、磁铁、铁等的影响。*通过此解决方案(在一种NSTimer中)，im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);有没有关于如何计算out....Thanks的想法？
回答 1
Stack Overflow用户
回答已采纳
发布于 2013-03-08 20:05:41
最后，我得到了这两个问题的答案。这是我正在使用的代码。希望能对某些人有所帮助。
MagneticField：.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"]);
}标高：.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。
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原文链接：
https://stackoverflow.com/questions/15273708
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