Log in and log out capture based on location in ios - ios

Question

I have worked on one application name time tracker. User can manually swipe in and swipe out manually by clicking the button.
Now I would like to make it as automatic based on the location detection. For that I am using CLLocationManager class. It works fine sometimes and sometimes it gives wrong swipe details. I am using below code.
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.distanceFilter = kCLDistanceFilterNone;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)
[locationManager requestWhenInUseAuthorization];
[locationManager startUpdatingLocation];
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
_latitude.text = [NSString stringWithFormat:#"Latitude: %f", newLocation.coordinate.latitude];
_longitude.text = [NSString stringWithFormat:#"Longitude: %f", newLocation.coordinate.longitude];
if([_latitude.text doubleValue] > 17.76890) && [_longitude.text doubleValue] > 78.34567) {
if (isSwipeIn) {
isSwipeIn = false;
//necessary swipe out UI and logic
} else {
isSwipeIn = true;
//necessary swipe in UI and logic
}
}
}
Can anyone help me on this..

Answer 1

Instead of comparing lat-long, go for a range check like if your device is within few meter mark as swipe in otherwise swipe out.
You can check distance between two lat-long using following method in Objective-C
CLLocation *location; // Your Location to compare
CLLocation *currentLocation; // Your current location
double distance = [location distanceFromLocation:currentLocation]; // Returns distance in meters
// Now lets say you are within 5 meters mark Swipe In
if(distance <= 5)
// Mark swipe IN
else
// Mark swipe OUT
I hope this will help you. Happy coding :)

Answer 2

There is another way to do this, you can get distance from target location and check it with horizontalAccuracy of current location.
The delta gives you the distance between current location and targeted location. If delta is less than (<) horizontalAccuracy than current location is in a circle with a radius of horizontalAccuracy.
If delta is greater than (>) horizontalAccuracy than current location is far away than your targeted location.
So now CLLocationManager delegate method will be looks like below:
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
_latitude.text = [NSString stringWithFormat:#"Latitude: %f", newLocation.coordinate.latitude];
_longitude.text = [NSString stringWithFormat:#"Longitude: %f", newLocation.coordinate.longitude];
// Create Location object for your target location. e.g. (17.76890,78.34567)
CLLocation *targetLocation = [[CLLocation alloc] initWithLatitude:17.76890 longitude:78.34567];
CLLocationDistance delta = [newLocation distanceFromLocation:targetLocation];
if (delta > newLocation.horizontalAccuracy) {
if (isSwipeIn) {
isSwipeIn = false;
//necessary swipe out UI and logic
} else {
isSwipeIn = true;
//necessary swipe in UI and logic
}
}
}