iOS 地图与定位开发系列教程(二)

下面我们来看一个位置类的基本步骤:

一、启动定位服务

CLLocationManager *locManager = [[CLLocationManager alloc] init];
locManager.delegate = self;
[locManager startUpdatingLocation];

二、获得位置信息

-(void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation fromLocation: (CLLocation *)oldLocation
{
NSTimeInterval howRecent = [newLocation.timestamp timeIntervalSinceNow];
if(howRecent < -10) return//离上次更新的时间少于10秒
if(newLocation.horizontalAccuracy > 100) return; //精度> 100米
//经度和纬度
double lat = newLocation.coordinate.latitude;
double lon = newLocation.coordinate.longitude;
}

三、获得方向信息(比如往南走)

-(void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading
{
//获得方向
CLLocationDirection heading = newHeading .trueHeading;
}

四、停止定位

[locManager stopUpdatingLocation];

你可以设置你想要的精度和距离过滤:

locManager.desiredAccuracy = kLLocationAccuracyBest;
locManager.distanceFilter = 1000;

 

posted on 2012-10-29 15:59  Solitary  阅读(191)  评论(0编辑  收藏  举报

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