我们正在开发iPhone应用程序，需要知道用户的大致位置。我们正在使用CoreLocation。我们可以在郊区环境中做到这一点，但在纽约市 - 我们无法获得任何经度/纬度信息。
我们怀疑在高层建筑中GPS信号很弱......但我们是否仍然无法获得一些大概的位置信息呢？
关于可能导致/解决此问题的任何想法？感谢。
#import "RootViewController.h"
#import "SlickEatsAppDelegate.h"
#import "SlickEatsWelcomePage.h"
#import "XMLParserShowTodaysOffer.h"
#import "SlickEatsSplashScreen.h"
@implementation RootViewController
@synthesize locationManager,currentLocation,appDelegate;
@synthesize getStartedButton,splashLogoImageView,howItWorkImageView,workButton,infoView;
@synthesize xmlParserShowTodaysOffer;//activityIndicator
#pragma mark -
#pragma mark View lifecycle
- (void)viewDidLoad {
[super viewDidLoad];
[self connectedToNetwork];
self.navigationController.navigationBar.hidden = TRUE;
if(locationManager == nil)
{
[[self locationManager] startUpdatingLocation];
}
//[self.view addSubview:SlickEatsView];
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
}
/*-(IBAction)getStartedButton_Clicked:(id)sender
{
activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
self.activityIndicator.frame = CGRectMake(135, 150, 40, 40);
[self.view addSubview:activityIndicator];
if (self.activityIndicator.isAnimating == NO)
{
[self.activityIndicator startAnimating];
}
/*if(locationManager == nil)
{
[[self locationManager] startUpdatingLocation];
}*/
/*SlickEatsWelcomePage *welcomePage = [[SlickEatsWelcomePage alloc]initWithNibName:@"SlickEatsWelcomePage" bundle:nil];
appDelegate = (SlickEatsAppDelegate *)[[UIApplication sharedApplication]delegate];
xmlParserShowTodaysOffer = [XMLParserShowTodaysOffer alloc];
xmlParserShowTodaysOffer.currentCity = appDelegate.myCurrentCity;
xmlParserShowTodaysOffer.currentLatitude = appDelegate.myCurrentLatitude;
xmlParserShowTodaysOffer.currentLongitude = appDelegate.myCurrentLongitude;
[xmlParserShowTodaysOffer initXMLParser];
[xmlParserShowTodaysOffer release];
[self.navigationController pushViewController:welcomePage animated:YES];
[welcomePage release];
[activityIndicator removeFromSuperview];
//[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"9763912503"]];
}*/
- (CLLocationManager *)locationManager {
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.distanceFilter = kCLDistanceFilterNone; // whenever we move
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters; // 100 m
[locationManager startUpdatingLocation];
return locationManager;
}
#pragma mark -
#pragma mark CLLocationManagerDelegate Methods
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation {
appDelegate = (SlickEatsAppDelegate *)[[UIApplication sharedApplication]delegate];
int degrees = newLocation.coordinate.latitude;
double decimal = fabs(newLocation.coordinate.latitude - degrees);
int minutes = decimal * 60;
double seconds = decimal * 3600 - minutes * 60;
NSString *lat = [NSString stringWithFormat:@"%d° %d' %1.4f\"",
degrees, minutes, seconds];
//latLabel.text = lat;
NSLog(@"Current..Latitude::%@",lat);
NSString *CurrentLatitude = [NSString stringWithFormat:@"%lf",newLocation.coordinate.latitude];
NSLog(@"Current..Latitude::%@",CurrentLatitude);
//self.myCurrentLatitude=lat;
degrees = newLocation.coordinate.longitude;
decimal = fabs(newLocation.coordinate.longitude - degrees);
minutes = decimal * 60;
seconds = decimal * 3600 - minutes * 60;
NSString *longt = [NSString stringWithFormat:@"%d° %d' %1.4f\"", degrees, minutes, seconds];
//longLabel.text = longt;
NSLog(@"Current..Longitude::%@",longt);
NSString *CurrentLongitude = [NSString stringWithFormat:@"%lf",newLocation.coordinate.longitude];
NSLog(@"Current..Longitude::%@",CurrentLongitude);
appDelegate.myCurrentLatitude = CurrentLatitude;
appDelegate.myCurrentLongitude = CurrentLongitude;
MKReverseGeocoder *geoCoder = [[MKReverseGeocoder alloc] initWithCoordinate:newLocation.coordinate];
geoCoder.delegate = self;
[geoCoder start];
}
// this delegate is called when the reverseGeocoder finds a placemark
- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark *)placemark
{
MKPlacemark * myPlacemark = placemark;
// with the placemark you can now retrieve the city name
NSString *city =[ myPlacemark.addressDictionary objectForKey:(NSString*) kABPersonAddressCityKey];
// NSString *city = (NSString *)[myPlacemark.locality length];
NSLog(@"Current Add::%@",city);
appDelegate.myCurrentCity = city;
//[self sendLocation];
}
// this delegate is called when the reversegeocoder fails to find a placemark
- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFailWithError:(NSError *)error
{
NSLog(@"reverseGeocoder:%@ didFailWithError:%@", geocoder, error);
}
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
NSLog(@"error%@",error);
switch([error code])
{
case kCLErrorNetwork: // general, network-related error
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"please check your network connection or that you are not in airplane mode" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
[alert show];
[alert release];
}
break;
case kCLErrorDenied:{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"user has denied to use current Location " delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
[alert show];
[alert release];
}
break;
default:
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"unknown network error" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
[alert show];
[alert release];
}
break;
}
}
-(void)sendLocation
{
NSLog(@"in Send Location..");
SlickEatsWelcomePage *welcomePage = [[SlickEatsWelcomePage alloc]initWithNibName:@"SlickEatsWelcomePage" bundle:nil];
appDelegate = (SlickEatsAppDelegate *)[[UIApplication sharedApplication]delegate];
xmlParserShowTodaysOffer = [XMLParserShowTodaysOffer alloc];
xmlParserShowTodaysOffer.currentCity = appDelegate.myCurrentCity;
xmlParserShowTodaysOffer.currentLatitude = appDelegate.myCurrentLatitude;
xmlParserShowTodaysOffer.currentLongitude = appDelegate.myCurrentLongitude;
[xmlParserShowTodaysOffer initXMLParser];
[xmlParserShowTodaysOffer release];
[self.navigationController pushViewController:welcomePage animated:YES];
[welcomePage release];
//[locationManager release];
}
-(IBAction)workButton_clicked:(id)sender
{
/*activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
self.activityIndicator.frame = CGRectMake(135, 150, 40, 40);
[self.splashLogoImageView addSubview:activityIndicator];
if (self.activityIndicator.isAnimating == NO)
{
[self.activityIndicator startAnimating];
}*/
SlickEatsSplashScreen *intro = [[SlickEatsSplashScreen alloc]initWithNibName:@"SlickEatsSplashScreen" bundle:nil];
[self.navigationController pushViewController:intro animated:YES];
[intro release];
//[activityIndicator removeFromSuperview];
}
- (void)connectedToNetwork {
BOOL aflag= ([NSString stringWithContentsOfURL:[NSURL URLWithString:@"http://www.google.co.in/"]]!=NULL)?YES:NO;
if (!aflag) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"Sorry!....You are not connected to network "
delegate:self cancelButtonTitle:@"Exit" otherButtonTitles:nil];
[alert show];
[alert release];
}
}
/*
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
}
*/
/*
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
}
*/
/*
- (void)viewDidDisappear:(BOOL)animated {
[super viewDidDisappear:animated];
}
*/
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations.
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
/*
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
// Return NO if you do not want the specified item to be editable.
return YES;
}
*/
/*
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the row from the data source.
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view.
}
}
*/
/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath {
}
*/
/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath {
// Return NO if you do not want the item to be re-orderable.
return YES;
}
*/
#pragma mark -
#pragma mark Memory management
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Relinquish ownership any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Relinquish ownership of anything that can be recreated in viewDidLoad or on demand.
// For example: self.myOutlet = nil;
}
- (void)dealloc {
[super dealloc];
[workButton release];
[howItWorkImageView release];
[splashLogoImageView release];
[getStartedButton release];
[locationManager release];
}
@end
答案 0 :(得分：0)
你有数据连接吗？我听说由于建筑物和网络过载，在曼哈顿的某些网络上建立连接有时很难。如果您没有获得数据，那么很难获得修复。
答案 1 :(得分：0)
我怀疑当GPS芯片由于高层建筑没有得到任何信号时，你要求类似GPS的准确度：
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters; // 100 m
尝试评论上述声明并在现场测试 - 看看你得到的坐标有多精确。