// While drawing polyline on GMSMapView
GMSPath *path = [GMSPath pathFromEncodedPath:strEncodedPolyline]; // Decoding encoded polyline string for converting to locations.
// Capture all path points in to a global array,So that we can track how user is travelling later.
arrLocationsOnPolyline = [NSMutableArray new]; // Make it fresh before filling
for (int counter = 0; counter < path.count; ++counter)
{
CLLocationCoordinate2D coordinate = [path coordinateAtIndex:counter];
CLLocation *locTemp = [[CLLocation alloc] initWithLatitude:coordinate.latitude longitude:coordinate.longitude];
[arrLocationsOnPolyline addObject:locTemp];
}
// Here,After loop ending, we'll get all path points as locations in to arrLocationsOnPolyline
// Now in -locationManager:didUpdateLocations: delegate method,
// 1. Find the index of nearest path point to user's current location in arrLocationsOnPolyline,Lets call it as nFoundAtIndexTemp.
// FMI : loop through the arrLocationsOnPolyline and find the nearest point's index to user's current location,
// Hold a global nLastFoundAtIndex variable and make it's default value as -1(in -viewDidLoad or somewhere),
// 2. Check
if (nLastFoundAtIndex >= 0 && nFoundAtIndexTemp > (nLastFoundAtIndex + 10)) // (Means app didn't received location updates but user actually traveled through more than 10 points on poyline drawn)
{
// 3. Hurray,You got him,Now animate your blue current location marker from the location at last stored nearest path point index and current nearest path point index of arrLocationsOnPolyline
}
// 4. Update nLastFoundAtIndex with current state
nLastFoundAtIndex = nFoundAtIndexTemp;
// Code To Animate user location marker through the missed points
// Call this function with array of user missed points(Probably from -locationManager:didUpdateLocations:),Marker will be animated through the points.
#pragma mark - Animating through the missed coordinates
-(void)animateMarker:(GMSMarker *)markerUserLocation throughTheMissedLocations:(NSMutableArray <CLLocation *> *)arrMissedLocations
{
@try
{
CLLocation *locTemp = arrMissedLocations.firstObject;
if(locTemp)
{
[CATransaction begin];
NSTimeInterval nAnimationDuration = 0.1; // Update this value as per your needs.
[CATransaction setAnimationDuration:nAnimationDuration];
markerUserLocation.position = locTemp.coordinate;
if(arrMissedLocations.count >= 1)
{
@try
{
[CATransaction setCompletionBlock:^
{
@try
{
[arrMissedLocations removeObject:locTemp];
[self animateMarker:markerUserLocation throughTheMissedLocations:arrMissedLocations];
}
@catch (NSException *exception)
{
NSLog(@"exception at %s function %@",__PRETTY_FUNCTION__,exception.debugDescription);
}
}];
}
@catch (NSException *exception)
{
NSLog(@"exception at %s function %@",__PRETTY_FUNCTION__,exception.debugDescription);
}
}
[CATransaction commit];
}
}
@catch (NSException *exception)
{
NSLog(@"exception at %s function %@",__PRETTY_FUNCTION__,exception.debugDescription);
}
}
私たちは、この以前をした、しかし、コードを投稿することはできません、しかし、うまくいけば、あなたは設計レベルのアイデアを得るでしょう。
希望に役立ちます。
回答がうまくいく場合は、回答としてマークしてください。 – Efren