I have three views that are subviews of the ViewController's view. Three labels toggling their respective visibility. In the "near me" feature I would like to display only items that are within 10-mile span user's current location.
In ViewController.h
#property (weak, nonatomic) IBOutlet MKMapView *nearMeMapView;
#property (strong, nonatomic) CLLocationManager *locationManager;
In ViewController.m
- (void)viewDidLoad
{
[super viewDidLoad];
self.locationManager.delegate = self;
self.nearMeMapView.delegate = self;
}
- (IBAction)nearMeTap:(id)sender
{
self.nearMeMapView.hidden = NO;
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
self.locationManager.distanceFilter = kCLDistanceFilterNone;
[self.locationManager startUpdatingLocation];
NSLog(#"near me tapped")
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
NSLog(#"didUpdateToLocation: %#", newLocation);
CLLocationCoordinate2D zoomLocation;
zoomLocation.latitude = newLocation.coordinate.latitude;
zoomLocation.longitude= newLocation.coordinate.latitude;
MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(zoomLocation, 10*METERS_PER_MILE, 10*METERS_PER_MILE);
[self.nearMeMapView setRegion:viewRegion animated:YES];
}
Anyway, the problem is that location of the device is detected correctly but MapView zooms and animates to entirely wrong location.
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
NSLog(#"didUpdateToLocation: %#", newLocation);
CLLocationCoordinate2D zoomLocation;
zoomLocation.latitude = newLocation.coordinate.latitude;
//This was set wrong in your function
zoomLocation.longitude= newLocation.coordinate.longitude;
MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(zoomLocation, 10*METERS_PER_MILE, 10*METERS_PER_MILE);
[self.nearMeMapView setRegion:viewRegion animated:YES];
}
The commented line was your problem
you were setting your zoom.longitude to a latitude position!
Related
For some reason when I launch my app it does everything correctly except show the user as blue dot on the map. It zooms in to the users current location, just no dot. Any help would be greatly appreciated.
I've added code and screenshots below for resources.
FrontViewController.h
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>
#interface FrontViewController : UIViewController <CLLocationManagerDelegate>
{
CLLocationManager *objLocationManager;
double latitude_UserLocation, longitude_UserLocation;
}
#property (weak, nonatomic) IBOutlet MKMapView *objMapView;
#end
FrontViewController.m
#import "FrontViewController.h"
#import "SWRevealViewController.h"
#interface FrontViewController()
// Private Methods:
- (IBAction)pushExample:(id)sender;
#end
#implementation FrontViewController
#synthesize objMapView;
- (void)viewDidLoad
{
[super viewDidLoad];
[self loadUserLocation];
//self.title = NSLocalizedString(#"Front View", nil);
SWRevealViewController *revealController = [self revealViewController];
[revealController panGestureRecognizer];
[revealController tapGestureRecognizer];
[self.navigationController.navigationBar addGestureRecognizer:revealController.panGestureRecognizer];
UIBarButtonItem *revealButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:#"reveal-icon.png"]
style:UIBarButtonItemStyleBordered target:revealController action:#selector(revealToggle:)];
self.navigationItem.leftBarButtonItem = revealButtonItem;
UIImageView* imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"BSEEK-Logo.png"]];
imageView.contentMode = UIViewContentModeScaleAspectFit;
UIView* titleView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 84, 84)];
imageView.frame = titleView.bounds;
[titleView addSubview:imageView];
self.navigationItem.titleView = titleView;
}
- (IBAction)pushExample:(id)sender
{
UIViewController *stubController = [[UIViewController alloc] init];
stubController.view.backgroundColor = [UIColor whiteColor];
[self.navigationController pushViewController:stubController animated:YES];
}
- (void) loadUserLocation
{
objLocationManager = [[CLLocationManager alloc] init];
objLocationManager.delegate = self;
objLocationManager.distanceFilter = kCLDistanceFilterNone;
objLocationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters;
if ([objLocationManager respondsToSelector:#selector(requestWhenInUseAuthorization)]) {
[objLocationManager requestWhenInUseAuthorization];
}
[objLocationManager startUpdatingLocation];
}
- (void)locationManager:(CLLocationManager *)manager
didUpdateLocations:(NSArray *)locations __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_6_0)
{
CLLocation *newLocation = [locations objectAtIndex:0];
latitude_UserLocation = newLocation.coordinate.latitude;
longitude_UserLocation = newLocation.coordinate.longitude;
[objLocationManager stopUpdatingLocation];
[self loadMapView];
}
- (void)locationManager:(CLLocationManager *)manager
didFailWithError:(NSError *)error
{
[objLocationManager stopUpdatingLocation];
}
- (void) loadMapView
{
CLLocationCoordinate2D objCoor2D = {.latitude = latitude_UserLocation, .longitude = longitude_UserLocation};
MKCoordinateSpan objCoorSpan = {.latitudeDelta = 0.2, .longitudeDelta = 0.2};
MKCoordinateRegion objMapRegion = {objCoor2D, objCoorSpan};
[objMapView setRegion:objMapRegion];
}
#end
Project Files
MKMapView has a showsUserLocation property. It looks like you need to turn that on.
You can set that property in code, but if your map view is created in a storyboard scene you can just check the User Location box in the storyboard editor:
Also: Make sure you have the appropriate key in your Info.plist to allow the app to access the user's location, and that you've granted the app appropriate permission on the device. (You can check in Settings->Privacy->Location Services.) If the app doesn't have permission to get the location, the map won't show it even if showsUserLocation is enabled.
//ViewController.h
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>
#interface ViewController : UIViewController<CLLocationManagerDelegate,MKMapViewDelegate>
#property (weak, nonatomic) IBOutlet UILabel *addresslbl;
#property (weak, nonatomic) IBOutlet MKMapView *mapView;
#end
//Viewcontroller.m
#import "ViewController.h"
#interface ViewController ()
{
CLLocationManager *locationManager;
CLLocationCoordinate2D updateLocation;
NSString *strAddress;
CLGeocoder *geocoder;
}
#end
#implementation ViewController
#define AzaveaCoordinate CLLocationCoordinate2DMake(19.167391, 73.247686)
- (void)viewDidLoad {
[super viewDidLoad];
[_mapView setRegion:MKCoordinateRegionMake(AzaveaCoordinate, MKCoordinateSpanMake(0.010, 0.010)) animated:YES];
geocoder = [[CLGeocoder alloc]init];
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager requestWhenInUseAuthorization];
self.mapView.delegate = self;
}
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
NSLog(#"didFailWithError: %#", error);
}
-(void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated
{
CLLocation *location = [[CLLocation alloc]initWithLatitude:mapView.centerCoordinate.latitude longitude:mapView.centerCoordinate.longitude];
[self geocode:location];
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation
{
CLLocation *currentLocation = newLocation;
self.mapView.centerCoordinate = currentLocation.coordinate;
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(currentLocation.coordinate,1500,1500);
[self.mapView setRegion: region animated:true];
[self geocode:currentLocation];
}
-(void)geocode:(CLLocation *)location
{
// geocoder = [[CLGeocoder alloc]init];
[geocoder cancelGeocode];
[geocoder reverseGeocodeLocation:location completionHandler:^(NSArray *data, NSError *error)
{
CLPlacemark *placemark = [data lastObject];
NSDictionary * addressDict = placemark.addressDictionary;
NSArray * addressList = addressDict[#"FormattedAddressLines"];
NSString * address = [NSString stringWithFormat:#"%#,%#,%#",addressList[0],addressList[1],addressList[2]];
NSLog(#" Address is :%#",address);
self.addresslbl.text = address;
}];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
This is the moveable map code like ola and uber. Means when i move the map, at that time the map pin is noted, the noted pin is given me address of the that particular area like city, state, pincode etc in label, but i want only the longitude, latitude value of this address in label.
so please help me about this code. How can i get the longitude latitude value in ?
Assuming that the label that you want to is self.addresslbl, change this method:
-(void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated
{
CLLocation *location = [[CLLocation alloc]initWithLatitude:mapView.centerCoordinate.latitude longitude:mapView.centerCoordinate.longitude];
[self geocode:location];
}
To:
-(void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated
{
self.addresslbl.text = [NSString stringWithFormat:#"%f, %f", mapView.centerCoordinate.longitude, mapView.centerCoordinate.latitude];
}
I'm trying to write a program that displays count, latitude and longitude in a UITextView that is a subview of the UIWindow. I couldn't make it to display the information properly on the simulator screen. Any help is appreciated!
#import "ViewController.h"
#import <CoreLocation/CoreLocation.h>
#interface ViewController () <CLLocationManagerDelegate>
#end
#implementation ViewController
{
CLLocationManager *locationManager;
int count;
}
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
count++;
CLLocation *location=locations[0];
UITextView *textview = [[UITextView alloc] initWithFrame:CGRectMake(20, 10, 280, 30)];
textview.backgroundColor=[UIColor whiteColor];
NSString *coun=[NSString stringWithFormat:#"%i",count];
NSString *lat=[NSString stringWithFormat:#"%f",location.coordinate.latitude];
NSString *lon=[NSString stringWithFormat:#"%f",location.coordinate.longitude];
textview.text =(#"%# %#-%#", coun, lat, lon);
[self.view addSubview:textview];
}
- (void)viewDidLoad {
[super viewDidLoad];
locationManager=[[CLLocationManager alloc] init];
locationManager.desiredAccuracy=kCLLocationAccuracyBest;
locationManager.distanceFilter=kCLDistanceFilterNone;
locationManager.delegate=self;
[locationManager startUpdatingLocation];
[locationManager requestWhenInUseAuthorization];
}
I hope , Following info can help you:
#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>
#interface yourController : UIViewController <CLLocationManagerDelegate> {
CLLocationManager *locationManager;
int count;
}
#end
and add this:
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.distanceFilter = kCLDistanceFilterNone;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)
[self.locationManager requestWhenInUseAuthorization];
[locationManager startUpdatingLocation];
callback function:
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
NSLog(#"OldLocation %f %f", oldLocation.coordinate.latitude, oldLocation.coordinate.longitude);
NSLog(#"NewLocation %f %f", newLocation.coordinate.latitude, newLocation.coordinate.longitude);
}
store the above values of latitude and longitude in string
NSString *coun=[NSString stringWithFormat:#"%i",count];
NSString *lat=[NSString stringWithFormat:#"%f",newlocation.coordinate.latitude];
NSString *lon=[NSString stringWithFormat:#"%f",newlocation.coordinate.longitude];
and then set it to textfield:
textview.text =(#"%# %#-%#", coun, lat, lon);
You also have to add a string for the (in info.plist)
[`NSLocationAlwaysUsageDescription`]
I'm trying to follow this tutorial:
http://www.appcoda.com/how-to-get-current-location-iphone-user/
Everything is fine till I add this line:
locationManager = [[CLLocationManager alloc] init];
Then I get the error.
I also get errors for these lines: (Xcode suggests I use "_LongitudeLabel"?
if (currentLocation != nil) {
longitudeLabel.text = [NSString stringWithFormat:#"%.8f", currentLocation.coordinate.longitude];
latitudeLabel.text = [NSString stringWithFormat:#"%.8f", currentLocation.coordinate.latitude];
}
Any idea what's wrong? Does the tutorial have errors or have I done something wrong?
Thanks!
This is ViewController.m file:
#import "ViewController.h"
#implementation MyLocationViewController {
CLLocationManager *locationManager;
}
#end
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
locationManager = [[CLLocationManager alloc] init];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)getCurrentLocation:(id)sender {
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];
}
#pragma mark - CLLocationManagerDelegate
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
NSLog(#"didFailWithError: %#", error);
UIAlertView *errorAlert = [[UIAlertView alloc]
initWithTitle:#"Error" message:#"Failed to Get Your Location" delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil];
[errorAlert show];
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
NSLog(#"didUpdateToLocation: %#", newLocation);
CLLocation *currentLocation = newLocation;
if (currentLocation != nil) {
longitudeLabel.text = [NSString stringWithFormat:#"%.8f", currentLocation.coordinate.longitude];
latitudeLabel.text = [NSString stringWithFormat:#"%.8f", currentLocation.coordinate.latitude];
}
}
#end
This is ViewController.h file:
// ViewController.h
// MyLocationDemo
//
// Created by Ian Nicoll on 12/11/14.
// Copyright (c) 2014 Ian Nicoll. All rights reserved.
//
#import <CoreLocation/CoreLocation.h>
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController
#property (weak, nonatomic) IBOutlet UILabel *LatitudeLabel;
#property (weak, nonatomic) IBOutlet UILabel *LongitudeLabel;
#property (weak, nonatomic) IBOutlet UILabel *addressLabel;
- (IBAction)getCurrentLocation:(id)sender;
#end
#interface MyLocationViewController : UIViewController <CLLocationManagerDelegate>
#end
The first issue is an error on your part. You declared locationManager in MyLocationViewController but try to initialize it in the viewDidLoad of ViewController, where it of course does not exist.
The second issue is an issue with the instructions. When you declare an #property, the default behavior is to create an instance variable with an underscore in front of it.
So #property (weak, nonatomic) IBOutlet UILabel *LatitudeLabel; can be accessed as self.latitudeLabel (which goes through the setter/getter) or just _latitudeLabel which accesses the ivar directly. The latter is probably what you want.
Ok so the build now is Succeeded (though I'm not 100& sure I got things right) but now I get a warning for this line: locationManager.delegate = self; - Assigning to 'id'from incompatible type 'ViewControler *const_strong'
Would you know how to fix this warning?
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController {
CLLocationManager *locationManager;
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
locationManager = [[CLLocationManager alloc] init];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)getCurrentLocation:(id)sender {
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];
}
#pragma mark - CLLocationManagerDelegate
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
NSLog(#"didFailWithError: %#", error);
UIAlertView *errorAlert = [[UIAlertView alloc]
initWithTitle:#"Error" message:#"Failed to Get Your Location" delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil];
[errorAlert show];
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
NSLog(#"didUpdateToLocation: %#", newLocation);
CLLocation *currentLocation = newLocation;
if (currentLocation != nil) {
_LongitudeLabel.text = [NSString stringWithFormat:#"%.8f", currentLocation.coordinate.longitude];
_LatitudeLabel.text = [NSString stringWithFormat:#"%.8f", currentLocation.coordinate.latitude];
}
}
#end
I've simple class with GPS.
also i've serched and i have found no solutions for me.
This example doesn't work for me
So my here it is my code:
#interface MFPointViewController () <CLLocationManagerDelegate>
#property (weak, nonatomic) IBOutlet UIWebView *webView;
#end
#implementation MFPointViewController{
CLLocationManager *manager;
CLGeocoder *geocoder;
CLPlacemark *placemark;
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
self.helper = [[AppHelper alloc]init];
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
manager = [[CLLocationManager alloc ]init];
geocoder = [[CLGeocoder alloc]init];
manager.delegate = self;
manager.desiredAccuracy = kCLLocationAccuracyBest;
[manager startUpdatingLocation];
[self.helper setBackgroundToVIew:self.view];
}
#pragma mark CLLocationManagerDelegate Methods
-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error{
[self.helper alert:#"Attenzione" message:#"Turn on geolocation" delegate:self];
}
-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{
CLLocation *currentLocation = newLocation;
if(currentLocation != nil){
NSString *Glat;
NSString *Glong;
Glat = [NSString stringWithFormat:#"%.8f",currentLocation.coordinate.latitude];
Glong = [NSString stringWithFormat:#"%.8f",currentLocation.coordinate.longitude];
// Here goes my logics
}
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
If i use one device with iOS 7 - this code work's fine.
On iOS 8 no.
What can it be?
Thanks to all!
In addition to nerowolfe's code you also need to add at least one of these to your Info.plist
NSLocationWhenInUseUsageDescription
NSLocationAlwaysUsageDescription
Put a descriptive string in them telling the user why you want to access their GPS.
Add this before startUpdateLocation
if([self.locationManager respondsToSelector:#selector(requestAlwaysAuthorization)]) {
[self.locationManager requestAlwaysAuthorization];
}