获取海拔高度. 实时气压

#import <CoreLocation/CoreLocation.h>
#import <MapKit/MapKit.h>


@property (nonatomic , strong) CLLocationManager * locationManager;
@property (nonatomic , strong) UILabel * altitude;//海拔
@property (nonatomic , strong) UILabel * verticalAccuracy;//垂直精度

    self.locationManager = [[CLLocationManager alloc] init];
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    self.locationManager.delegate = self;
    [self.locationManager requestAlwaysAuthorization];
    [self.locationManager startUpdatingLocation];


//实现回调
-(void)locationManager:(CLLocationManager *)manager
   didUpdateToLocation:(CLLocation *)newLocation
          fromLocation:(CLLocation *)oldLocation
{
    float altitude = newLocation.altitude;
    float verticalAccuracy = newLocation.verticalAccuracy;
    NSLog(@"%.2fm == %.2fm",altitude ,verticalAccuracy);
    self.altitude.text = [NSString stringWithFormat:@"海拔高度:%.2fm",altitude];
    self.verticalAccuracy.text = [NSString stringWithFormat:@"垂直精度 :%.2fm",verticalAccuracy];
}

//error回调
-(void)locationManager:(CLLocationManager *)manager
      didFailWithError:(NSError *)error
{
    NSLog(@"error.userInfo：%@
error.domain：%@",error.userInfo,error.domain);
}

#import <CoreMotion/CMAltimeter.h>


@property (nonatomic , strong) CMAltimeter *altimeter;



//检测设备是否支持气压计
    if (![CMAltimeter isRelativeAltitudeAvailable]) {
        NSLog(@"Barometer is not available on this device. Sorry!");
        return;
    }
    
    
    //启用气压计
    
    self.altimeter = [[CMAltimeter alloc]init];
    
    [self.altimeter startRelativeAltitudeUpdatesToQueue:NSOperationQueue.mainQueue withHandler:^(CMAltitudeData * _Nullable altitudeData, NSError * _Nullable error) {
        
        NSLog(@"%lf",[altitudeData.relativeAltitude floatValue]);
        
        NSLog(@"%@",error);
        
    }];