Holen Benutzer Benutzer auf Cocoa-Touch

Question

Ich versuche, die Benutzer Lat und Long von GPS-Daten auf dem iPhone zu bekommen.

hier ist mein Code:

// 
// SendLocView.m 
// AMR App 
// 
// Created by Fletcher on 07/04/2016. 
// Copyright © 2016 LaserCamel Programing. All rights reserved. 
// 

#import "SendLocView.h" 
@import CoreLocation; 

@interface SendLocView() 

@end 

@implementation SendLocView 



- (void)viewDidLoad { 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view. 
    self.locationManager = [[CLLocationManager alloc] init]; 
    self.locationManager.delegate = self; 
    // Check for iOS 8. Without this guard the code will crash with "unknown selector" on iOS 7. 
    if ([self.locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) { 
     [self.locationManager requestWhenInUseAuthorization]; 
    } 
    [self.locationManager startUpdatingLocation]; 
} 

- (void)didReceiveMemoryWarning { 
    [super didReceiveMemoryWarning]; 
    // Dispose of any resources that can be recreated. 
} 

/* 
#pragma mark - Navigation 

// In a storyboard-based application, you will often want to do a little preparation before navigation 
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { 
    // Get the new view controller using [segue destinationViewController]. 
    // Pass the selected object to the new view controller. 
} 
*/ 
- (IBAction)location_send:(id)sender { 
    [self.locationManager requestAlwaysAuthorization]; 
    NSString *Globalusername = @"1111"; 
    float latitude = locationManager.location.coordinate.latitude; 
    float longitude = locationManager.location.coordinate.longitude; 

    NSLog(@"Value of username is %@", Globalusername); 
    NSLog(@"Value of latitude is %f", latitude); 
    NSLog(@"Value of longitude is %f", longitude); 


    NSString *post =[[NSString alloc] initWithFormat:@"lat=%f&long=%f&username=%@",latitude,longitude,Globalusername]; 
    NSLog(@"PostData: %@",post); 

    NSURL *url=[NSURL URLWithString:@"https://www.webaddress.org.uk/mobile/jsontracking.php"]; 

    NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES]; 

    NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)[postData length]]; 

    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init]; 
    [request setURL:url]; 
    [request setHTTPMethod:@"POST"]; 
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"]; 
    [request setValue:@"application/json" forHTTPHeaderField:@"Accept"]; 
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"]; 
    [request setHTTPBody:postData]; 




} 


- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations 
{ 
    NSLog(@"%@", [locations lastObject]); 
} 

- (void)requestAlwaysAuthorization 
{ 
    CLAuthorizationStatus status = [CLLocationManager authorizationStatus]; 

    // If the status is denied or only granted for when in use, display an alert 
    if (status == kCLAuthorizationStatusAuthorizedWhenInUse || status == kCLAuthorizationStatusDenied) { 
     NSString *title; 
     title = (status == kCLAuthorizationStatusDenied) ? @"Location services are off" : @"Background location is not enabled"; 
     NSString *message = @"To use background location you must turn on 'Always' in the Location Services Settings"; 

     UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:title 
                  message:message 
                  delegate:self 
                cancelButtonTitle:@"Cancel" 
                otherButtonTitles:@"Settings", nil]; 
     [alertView show]; 
    } 
    // The user has not enabled any location services. Request background authorization. 
    else if (status == kCLAuthorizationStatusNotDetermined) { 
     [self.locationManager requestAlwaysAuthorization]; 
    } 
} 

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex 
{ 
    if (buttonIndex == 1) { 
     // Send the user to the Settings for this app 
     NSURL *settingsURL = [NSURL URLWithString:UIApplicationOpenSettingsURLString]; 
     [[UIApplication sharedApplication] openURL:settingsURL]; 
    } 
} 

@end 

Mein Stromausgang von NSLog (@ "Wert der Breite ist% f", Breitengrad); ist

2016-04-08 21:54:29.170 AMR App[1394:467604] Value of latitude is 0.000000 

Aber die NSLog (@ "% @", [Standorte LastObject]); Ausgang ist

2016-04-08 21:55:38.186 AMR App[1394:467604] <+51.50483880,-3.16954134> +/- 65.00m (speed -1.00 mps/course -1.00) @ 08/04/2016, 21:55:38 British Summer Time 

jede Hilfe, warum dies wäre toll geschieht

Answer 1

Die Dokumentation für CLLocationManager besagt, dass es Standortinformationen asynchron aufgelöst wird, was bedeutet, dass Sie keine Annahmen darüber treffen können, was Ihnen zur Verfügung sein könnte jederzeit.

Die AppleDoc Diskussion für -startUpdatingLocation erklärt, warum die Werte Null in der ersten Protokollmeldung sind:

This method returns immediately. Calling this method causes the location manager to obtain an initial location fix (which may take several seconds) and notify your delegate by calling its locationManager:didUpdateLocations: method.

Also, Sie sollten keine gültigen Standortinformationen zu haben, erwarten, bis die -locationManager:didUpdateLocations: Delegat-Methode aufgerufen wird. Anhand der Zeitstempel in Ihrer Protokollnachricht wird deutlich, dass die Auflösung des Standorts ungefähr 1 Sekunde länger dauerte. Dies entspricht dem dokumentierten Zeitrahmen von Apple Engineering.

Hinweis: Die Dokumente legen nahe, auch das Scheitern Verfahren implementiert ...

In addition to your delegate object implementing the locationManager:didUpdateLocations: method, it should also implement the locationManager:didFailWithError: method to respond to potential errors.