I am trying to make a gps location app in which it gets the users latitude and longitude.I want to request the location when user starts the app .
if([self.locationManager
respondsToSelector:#selector(requestWhenInUseAuthorization)])
{
[self.locationManager requestWhenInUseAuthorization];
}
else
{
[self.locationManager startUpdatingLocation];
}
But its not helping i also try
if([CLLocationManager locationServicesEnabled]){
NSLog(#"Location Services Enabled");
if([CLLocationManager authorizationStatus]==kCLAuthorizationStatusDenied){
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"App Permission Denied"
message:#"To re-enable, please go to Settings and turn on Location Service for this app."
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[alert show];
}
}
Its not helping also.
You would need to add a key for location request
NSLocationWhenInUseUsageDescription in your plist file
and NSLocationAlwaysUsageDescription key if you want location in background also.
Related
For the first time I am playing with APNS, I tried to run a proof of concept, with an iOS 5.0.1 device, and the didFailToRegisterForRemoteNotificationsWithError is fired. I know it has been fired because I show an UIAlertView to notify the error:
- (void)application:(UIApplication*)application
didFailToRegisterForRemoteNotificationsWithError:(NSError*)error
{
// Inform the user that registration failed
NSString* failureMessage = #"There was an error while trying to \
register for push notifications.";
UIAlertView* failureAlert = [[UIAlertView alloc] initWithTitle:#"Error"
message:failureMessage
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[failureAlert show];
[failureAlert release];
}
How can I get more info about the error?
Try doing something like NSLog(#"%#", error.userInfo");, that should output some info into the terminal.
I ended up with this code, which works and lets me progress a bit:
NSString* failureMessage = error.localizedDescription;
UIAlertView* failureAlert = [[UIAlertView alloc] initWithTitle:#"Error"
message:failureMessage
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[failureAlert show];
Sorry, iObjectiveC noob here.
I am trying to make an app in which the view will check whether the location services are enabled or not . If it is not enabled then it will prompt one with a pop up but still it will keep on searching for location but not prompt. As soon as the location services are enabled it will continue its process.
How to do that???
You cannot continue getting the location if location service are disabled.
If you want to continue searching for location be sure that the service is enable by checking
[CLLocationManager locationServicesEnabled]
If enabled, start updating the location
[locationManager startUpdatingLocation];
Then in
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation {
[locationManager stopUpdatingLocation]; // This will stop to check the location
}
remove this code to still check the location [locationManager stopUpdatingLocation];, but this is not the best approach, be sure to read the apple documentation for the policy of getting the location
You can check location services availability through this code :
MKUserLocation *userLocation = map.userLocation;
BOOL locationAllowed = [CLLocationManager locationServicesEnabled];
BOOL locationAvailable = userLocation.location!=nil;
if (locationAllowed==NO) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Location Service Disabled"
message:#"To re-enable, please go to Settings and turn on Location Service for this app."
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[alert show];
[alert release];
} else {
if (locationAvailable==NO)
[self.map.userLocation addObserver:self forKeyPath:#"location" options:(NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld) context:nil];
}
Add in .h file int counter;
In your view's viewDidLoad method add this as it will check for every second u can increase counter:
[NSTimer scheduledTimerWithTimeInterval:1.0
target:self
selector:#selector(checkLocationMangerEnabled:)
userInfo:nil
repeats:YES];
counter = 0;
Now selector would be:
-(void)checkLocationMangerEnabled:(id)sender
{
if([CLLocationManager locationServicesEnabled])
{
//here location is enabled
}
else
{ //Not enabled
if(counter == 60) // alert will showed in every 1 min u can increase or decrese
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Location Service Disabled"
message:#"To re-enable, please go to Settings and turn on Location Service for this app."
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[alert show];
[alert release];
}
counter++;
}
}
I am showing alertViews when Location manager unable to find current location. I did it like this
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
[manager stopUpdatingLocation];
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;
}
}
My problem is locationManager didFailWithError method get called repeatedly. So my alertviews repeatedly display.
How can I solve this issue?
Apple documentation states:
If the location service is unable to retrieve a location right away,
it reports a kCLErrorLocationUnknown error and keeps trying. In such a
situation, you can simply ignore the error and wait for a new event.
If the user denies your application’s use of the location service,
this method reports a kCLErrorDenied error. Upon receiving such an
error, you should stop the location service.
So you might skip some cases where you stop updating and show the alert, especially the default case.
A good start for error messages that can be triggered by an ongoing background process - like the location manager - is to store the reference to the UIAlertView. When the delegate receives alertView:clickedButtonAtIndex:, reset this reference to nil. Before displaying new errors, check if one is already visible.
Even better, don't display modal error messages from background processes. Just walking around, you'll occasionally lose reception, and it's tedious to have to dismiss an error when that happens. If your app has a configuration or help screen, include a space there for the most recent error message from the Location Manager (or Game Center, or iCloud, or anything else that loses connectivity occasionally.)
I want to get the user's current location from my iPhone app. I want to show the user's current location like country name, latitude, longitude information in my app. And also i want to show the location in Google map also. I have tried Google search also, but can't get the exact answer. I have get the info that was to use CLLocationManager in my app to track the location. How do i use this? I have download one sample app from Apple Documents. Here is the link: https://developer.apple.com/library/ios/#samplecode/LocateMe/Introduction/Intro.html
Can you please help me on this? Thanks in advance.
1) I have get the info that was to use CLLocationManager in my app to track the location. How do i use this?
in .h file
#include <CoreLocation/CLLocationManagerDelegate.h>
#include <CoreLocation/CLError.h>
#include <CoreLocation/CLLocation.h>
#include <CoreLocation/CLLocationManager.h>
CLLocationManager * myLocationManager;
CLLocation * myLocation;
in .m file :-
-(void)findMyCurrentLocation
{
self.myLocationManager = [[[CLLocationManager alloc] init] autorelease];
[[self myLocationManager] setDelegate:self ];
[myLocationManager startUpdatingLocation];
double latitude=34.052234;
double longitude=-118.243685;
CLLocation *defaultLocation =[[CLLocation alloc] initWithLatitude:latitude longitude:longitude];
[self setMyLocation:defaultLocation];
[defaultLocation release];
if( [CLLocationManager locationServicesEnabled] )
{
NSLog(#"Location Services Enabled....");
locationServicesEnabled=TRUE;
UIAlertView *alert = [ [UIAlertView alloc] initWithTitle:#"Information"
message:#"Fetching your current location."
delegate:self
cancelButtonTitle:#"OK"
otherButtonTitles:nil ];
[alert release];
}
else
{
NSLog( #"Location Services Are Not Enabled...." );
locationServicesEnabled=FALSE;
UIAlertView *alert = [ [UIAlertView alloc] initWithTitle:#"Information"
message:#"Location service is not enable. Please enable it from settings."
delegate:self
cancelButtonTitle:#"OK"
otherButtonTitles:nil ];
[alert release];
}
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation: (CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
[self setMyLocation:newLocation];
NSString *tempLat = [ NSString stringWithFormat:#"%3.6f" , (newLocation.coordinate.latitude) ];
NSString *tempLong= [ NSString stringWithFormat:#"%3.6f" , (newLocation.coordinate.longitude)];
appDelegate.curlat = tempLat;
appDelegate.curlong = tempLong;
}
- (void)locationManager: (CLLocationManager *)manager didFailWithError: (NSError *)error
{
printf("\nerror");
UIAlertView *alert = [ [UIAlertView alloc] initWithTitle:#"Error"
message:#"Error while getting your current location."
delegate:self
cancelButtonTitle:#"OK"
otherButtonTitles:nil ];
[alert release];
}
2). I want to show the user's current location like country name information in my app.
For this you can to use Google's Reverse Geo coding OR MKReverseGeocoder
this should do most of it..
http://www.highoncoding.com/Articles/804_Introduction_to_MapKit_Framework_for_iPhone_Development.aspx
to get the information on the location you need to use MKReverseGeocoder
https://developer.apple.com/library/ios/#documentation/MapKit/Reference/MKReverseGeocoder_Class/Reference/Reference.html#//apple_ref/doc/uid/TP40008323
First create an instance of the MKMapView
To get user's latitude and longitude:
In your viewDidLoad
[yourMapView setShowsUserLocation:YES];
CLLocationCoordinate2D userCoord;
userCoord.latitude=map_view.userLocation.coordinate.latitude;
userCoord.longitude=map_view.userLocation.coordinate.longitude;
//NSLogging these on simulator will give you Cupertino or whatever location you set in location simulation.
And for country name you will need reversegeocoding you can look at the class reference here
https://developer.apple.com/library/ios/#documentation/MapKit/Reference/MKReverseGeocoder_Class/Reference/Reference.html#//apple_ref/doc/uid/TP40008323
OR
If MKReverseGeoCoding gets too complicated you can use Yahoo's reversegeocoder
http://where.yahooapis.com/geocode?q=%f,%f&gflags=R&appid=yourAppId, those 2 %f will be userCoord.longitude and userCoord.latitude.
Yes you can use CLGeoCoder. But CLGeaCoder will not provide accrurate location inforamtion outside of USA for other country like India etc. So better to use Google's Reverse Geo coding SVGeoCoder. SVGeoCoder have nice implementation to get location with goolePlaceAPI.
When you first try to access a user's ALAssetsLibrary, the OS will present them with a dialog asking for permission. If they do not allow this, a failureBlock will be called and will always be called in the future. Is there a way to force a prompt of this authorization request again?
I notice in the Maps app, that they inform the user to go to the Settings app to turn on location services with a button. However, there is no way that I know of to programmatically open the Settings app. Should I just display directions as to how to turn on the location services?
You can't open up the settings app in an Apple approved manner.
The best you can hope for is to trap the error and then display a UIAlertView or other view with instructions on how to do this. Take a look at the latest v. of the Dropbox app for an idea on how they instruct the user.
When you try to access the Library from your code, you can use the error handler to catch the error and display an alert specifying to the user what to do.
Example
failureBlock:^(NSError *error) {
// error handling
if (error.code == ALAssetsLibraryAccessGloballyDeniedError) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Error!"
message:#"Error loading image... \nEnable Location Services in 'Settings -> Location Services'."
delegate:self cancelButtonTitle:#"OK"
otherButtonTitles:nil, nil];
[alert show];
} else if (error.code == ALAssetsLibraryAccessUserDeniedError) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Error!"
message:[NSString stringWithFormat:#"Error loading image... \nEnable Location Services in 'Settings -> Location Services' for %#.", [[[NSBundle mainBundle] infoDictionary] objectForKey:#"CFBundleDisplayName"]]
delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil, nil];
[alert show];
} else {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Error!" message:#"Error loading image..." delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil, nil];
[alert show];
}
}