#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 *)managerdidUpdateToLocation:(CLLocation *)newLocationfromLocation:(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 *)managerdidFailWithError:(NSError *)error
{NSLog(@"error.userInfo：%@\nerror.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);}];