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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。在将其发送到服务器时，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）。请帮助我....我在 ViewDidLoad 中尝试了以下代码----：

(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);}

我要检查一下，如果我从服务器得到的响应是登录成功，那么只将位置发送到服务器，这就是我使用 if-else 语句的原因。如下所示：

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{
}

请帮助我...如何检查位置是否改变？...如果条件我应该写什么并将其发送到服务器。

4

3 回答 3

1

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];

第2步

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");
 }
于 2016-05-19T07:52:50.777 回答
0

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];

您将收到的距离将以米为单位。您可以使用获得的距离在 If-Else 循环中执行您的条件。

于 2016-05-19T06:48:48.810 回答
0

请检查此答案以每 n 秒向服务器发送一次位置

当应用程序在后台时向服务器发送纬度和经度

于 2016-05-19T11:57:02.940 回答