本文摘自:YIFEIYANG
iPhone开发进阶(10)--- 在程序中使用GPS
这一回简单地介绍一下GPS的使用方法。使用GPS大致分下面两步。
- 添加 CoreLocation.framework。
- 生成 CLLocationManager 测量位置。
测试代码如下:
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66 | #import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>
@interface LocationViewCtrl : UIViewController <CLLocationManagerDelegate>{
CLLocationManager *man;
}
@property(nonatomic, retain) CLLocationManager *man;
@end
LocationViewCtrl.m
#import "LocationViewCtrl.h"
#import <CoreLocation/CoreLocation.h>
@implementation LocationViewCtrl
@synthesize man;
- (void)viewDidLoad {
[super viewDidLoad];
man = [[CLLocationManager alloc] init];
if([man locationServicesEnabled]){
man.delegate = self;
man.distanceFilter = kCLDistanceFilterNone;
man.desiredAccuracy = kCLLocationAccuracyBest;
[man startUpdatingLocation];
}
}
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation{
CLLocationCoordinate2D coordinate = newLocation.coordinate;
CLLocationDegrees latitude = coordinate.latitude;
CLLocationDegrees longitude = coordinate.longitude;
CLLocationAccuracy horizontal = newLocation.horizontalAccuracy;
CLLocationAccuracy vertical = newLocation.verticalAccuracy;
CLLocationDistance altitude = newLocation.altitude;
NSDate *timestamp = [newLocation timestamp];
NSLog([newLocation description]);
if(oldLocation != nil){
CLLocationDistance d = [newLocation getDistanceFrom:oldLocation];
NSLog([NSString stringWithFormat:@"%f", d]);
}
}
- (void)locationManager:(CLLocationManager *)manager
didFailWithError:(NSError *)error{
NSLog([error localizedDescription]);
}
... |
测量精度有以下几类,精度越高越消耗电力。
kCLLocationAccuracyNearestTenMeters | 10m |
kCLLocationAccuracyHundredMeters | 100m |
kCLLocationAccuracyKilometer | 1km |
kCLLocationAccuracyThreeKilometers | 3km |
因为在模拟器上不能设置经纬度,所以只能在实际设备中测试你的GPS程序。