在Mapview Xcode中更新位置

Question

在我当前的项目中。

我需要用户的位置在每个50 meter用户移动。

所以基本上在打开应用程序后，每50 meter更改我需要在Objective c呼叫Web服务的用户位置。另外我希望当应用程序处于后台状态时运行相同的进程。

在此先感谢

Answer 1

您的位置设置轨道

//create location manager object 
locationManager = [[CLLocationManager alloc] init]; 

//there will be a warning from this line of code 
[locationManager setDelegate:self]; 

//and we want it to be as accurate as possible 
//regardless of how much time/power it takes 
[locationManager setDesiredAccuracy:kCLLocationAccuracyBest]; 

//set the amount of metres travelled before location update is made 
[locationManager setDistanceFilter:50]; 

，并添加

if ([CLLocationManager locationServicesEnabled]) { 
    [self.locationManager startUpdatingLocation]; 
} 

更新

-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations { 
CLLocation *location = locations.lastObject; 
NSLog(@"%@", location.description); 

//In here you get all details like 

    NSLog(@"latitude = %@",location.coordinate.latitude); 
    NSLog(@"longitude = %@",location.coordinate.longitude); 
    NSLog(@"altitude = %@",location.altitude); 
    NSLog(@"horizontalAccuracy = %@",location.horizontalAccuracy); 
    NSLog(@"verticalAccuracy = %@",location.verticalAccuracy); 
    NSLog(@"timestamp = %@",location.timestamp); 
    NSLog(@"speed = %@",location.speed); 
    NSLog(@"course = %@",location.course); 

} 

Answer 2

1. 你必须让应用程序启动时CLLocationManager的对象，并设置它的委托

添加下面的代码来获取用户当前位置

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

现在添加didUpdateToLocation的CLLocationManagaer的委托并在其中添加以下代码。

CLLocationDistance meters = [newLocation distanceFromLocation：oldLocation];

if(meters==50) 
{ 
    // CALL YOU WEBSERVICE 
}