Question

我是iOS应用程序开发的新手。我将使用AFNetworking 3.0。我想在后台更新位置并将其发送到服务器。发送到服务器，我想条件： 1）如果位置没有改变我想调用服务sendlocation1 2）如果位置改变我想调用服务sendlocation2。位置变化（近约50米）。请帮我.... 我试过以下代码---- 在ViewDidLoad中：

(void)viewDidLoad {
[super viewDidLoad];

locationManager = [[CLLocationManager alloc] init];
locationManager.distanceFilter = kCLDistanceFilterNone;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];

[locationManager requestAlwaysAuthorization]; 



float Lat = locationManager.location.coordinate.latitude;
float Long = locationManager.location.coordinate.longitude;
NSLog(@"Lat : %f  Long : %f",Lat,Long);}

我要检查，如果我从服务器获得响应是登录成功然后只发送位置到服务器，这就是为什么我使用if-else statement.like跟随：

if ([_str isEqualToString:@"Login Success"]) {

        UIAlertController *Loginalert=   [UIAlertController

                                          alertControllerWithTitle:@"Login Success"

                                          message:@"This app is going to close now"

                                          preferredStyle:UIAlertControllerStyleAlert];


        UIAlertAction* yesButton = [UIAlertAction

                                    actionWithTitle:@"Ok"

                                    style:UIAlertActionStyleDefault

                                    handler:^(UIAlertAction * action)

                                    {
                                        if () {
                                            [self sendlocation1];
                                        } else {
                                            [self sendlocation2];
                                        }

                                        [Loginalert dismissViewControllerAnimated:YES completion:nil];



                                    }];

        [Loginalert addAction: yesButton];




    } else {

        NSLog(@"Something Wrong");

最后

(void)sendlocation1{
}

(void)sendlocation2{
}

请帮帮我...如何查看位置是否有变化？ ...如果有条件我应该写什么并将其发送到服务器。

Answer 1

<强>步骤1

 (void)viewDidLoad {
[super viewDidLoad];

locationManager = [[CLLocationManager alloc] init];
//set the amount of metres travelled before location update is made
[locationManager setDistanceFilter:50];
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];

[locationManager requestAlwaysAuthorization]; 

// call the timer with 5 minutes cap using 5 * 60 = 300
[NSTimer scheduledTimerWithTimeInterval:300.0f target:self selector:@selector(sendlocation1) userInfo:nil repeats:YES];

<强>步骤-2

每50米更换设备此方法称为：

 -(void)locationManager:(CLLocationManager *)manager
   didUpdateToLocation:(CLLocation *)newLocation
          fromLocation:(CLLocation *)oldLocation
{
    NSLog(@"%f",newLocation.coordinate.latitude);

    NSLog(@"%f",newLocation.coordinate.longitude);
    CLLocationDistance meters = [newLocation distanceFromLocation:oldLocation];
         if(meters >=50)
      {
         // call webservice for location is updated 
         [self sendlocation1];
      }else
      {
       // call normal method
       [self webservice_UpdateLocation];
       }
    }
}

-(void)webservice_UpdateLocation
{
    if ([_str isEqualToString:@"Login Success"]) {

        UIAlertController *Loginalert=   [UIAlertController

                                          alertControllerWithTitle:@"Login Success"

                                          message:@"This app is going to close now"

                                          preferredStyle:UIAlertControllerStyleAlert];


        UIAlertAction* yesButton = [UIAlertAction

                                    actionWithTitle:@"Ok"

                                    style:UIAlertActionStyleDefault

                                    handler:^(UIAlertAction * action)

                                    {



                                            [self sendlocation2];


                                        [Loginalert dismissViewControllerAnimated:YES completion:nil];



                                    }];

        [Loginalert addAction: yesButton];




    } else {

        NSLog(@"Something Wrong");
 }

Answer 2

您可以使用CLLocation检查2（coord_A，coord_B）坐标的位移。

 CLLocationDistance distance = [coord_A distanceFromLocation:coord_B];

您将收到的距离以米为单位。您可以使用获得的距离在If-Else循环中执行条件。

Answer 3

请检查此答案，以便每n秒向服务器发送一次

Sending Latitude and Longitude to Server when app is in background

如果使用AFN 3进行位置更改，如何定期向服务器发送背景位置？

3 个答案: