在Google地圖上創建長途路徑時，應用程序崩潰

Question

我正在處理兩個位置之間的路徑的應用程序。 我實現了一些代碼。對於短距離路徑來說這很好，但是當我創建像從齋浦爾，拉賈斯坦邦，印度到印度阿薩姆Jorhat的長距離路徑時，我的應用程序崩潰。

這是我的代碼

-(void)findPath{ 
[rectangle setMap:nil]; 


NSString* str = [NSMutableString stringWithFormat:@"http://maps.googleapis.com/maps/api/directions/json?origin=%@&destination=%@&sensor=true", self.FromSearch, self.toSearch]; 

if (_travelMode==UICGTravelModeWalking) { 
    str=[str stringByAppendingFormat:@"&mode=walking"]; 
} 

NSURL *url=[[NSURL alloc]initWithString:[str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]; 

NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; 

NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; 

NSError* error; 
NSDictionary* json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error]; 

NSArray* latestRoutes = [json objectForKey:@"routes"]; 

NSString *points=[[[latestRoutes objectAtIndex:0] objectForKey:@"overview_polyline"] objectForKey:@"points"]; 
if ([latestRoutes isKindOfClass:[NSArray class]]&&latestRoutes.count==0) { 
    UIAlertView *alrt=[[UIAlertView alloc]initWithTitle:@"Alert" message:@"didn't find direction" delegate:nil cancelButtonTitle:@"ok" otherButtonTitles:nil, nil]; 
    [alrt show]; 
    return; 
} 
arrDistance =[[[json valueForKeyPath:@"routes.legs.steps.distance.text"] objectAtIndex:0]objectAtIndex:0]; 
totalDuration = [[[json valueForKeyPath:@"routes.legs.duration.text"] objectAtIndex:0]objectAtIndex:0]; 
totalDistance = [[[json valueForKeyPath:@"routes.legs.distance.text"] objectAtIndex:0]objectAtIndex:0]; 
arrDescription =[[[json valueForKeyPath:@"routes.legs.steps.html_instructions"] objectAtIndex:0] objectAtIndex:0]; 
dictRouteInfo=[NSDictionary dictionaryWithObjectsAndKeys:totalDistance,@"totalDistance",totalDuration,@"totalDuration",arrDistance ,@"distance",arrDescription,@"description", nil]; 
double srcLat=[[[[json valueForKeyPath:@"routes.legs.start_location.lat"] objectAtIndex:0] objectAtIndex:0] doubleValue]; 
double srcLong=[[[[json valueForKeyPath:@"routes.legs.start_location.lng"] objectAtIndex:0] objectAtIndex:0] doubleValue]; 
totalLat = [[NSMutableArray alloc]init]; 
totalLong = [[NSMutableArray alloc]init]; 
    //for (int i = 0; i<arrDistance.count; i++) { 
    totalLat = [[[json valueForKeyPath:@"routes.legs.steps.start_location.lat"] objectAtIndex:0] objectAtIndex:0]; 
totalLong = [[[json valueForKeyPath:@"routes.legs.steps.start_location.lng"] objectAtIndex:0] objectAtIndex:0]; 

[self saveInfoForPath]; 

// } 


CLLocationCoordinate2D location; 
location.latitude = srcLat; 
location.longitude = srcLong; 
// mapView.camera = [GMSCameraPosition cameraWithTarget:location 

              //  zoom:10]; 
    //GMSCoordinateBounds *bounds = [[GMSCoordinateBounds alloc]initWithPath:<#(GMSPath *)#>] 
// [[GMSCoordinateBounds alloc] initWithCoordinate:vancouver coordinate:calgary]; 







@try { 
    // TODO: better parsing. Regular expression? 

    NSArray *temp= [self decodePolyLine:[points mutableCopy]]; 

    GMSMutablePath *path = [GMSMutablePath path]; 


    for(int idx = 0; idx < [temp count]; idx++) 
    { 
     CLLocation *location=[temp objectAtIndex:idx]; 

     [path addCoordinate:location.coordinate]; 

    } 
    // create the polyline based on the array of points. 

    rectangle = [GMSPolyline polylineWithPath:path]; 

    rectangle.strokeWidth=5.0; 

    rectangle.map = mapView; 
    GMSCoordinateBounds *bounds = [[GMSCoordinateBounds alloc]initWithPath:path]; 
    [mapView moveCamera:[GMSCameraUpdate fitBounds:bounds]]; 


} 
@catch (NSException * e) { 
    // TODO: show error 
} 



} 

decodePolyline（）方法編碼

-(NSMutableArray *)decodePolyLine: (NSMutableString *)encoded { 
[encoded replaceOccurrencesOfString:@"\\\\" withString:@"\\" 
          options:NSLiteralSearch 
           range:NSMakeRange(0, [encoded length])]; 
NSInteger len = [encoded length]; 
NSInteger index = 0; 
NSMutableArray *array = [[NSMutableArray alloc] init] ; 
NSInteger lat=0; 
NSInteger lng=0; 
while (index < len) { 
    NSInteger b; 
    NSInteger shift = 0; 
    NSInteger result = 0; 
    do { 
     b = [encoded characterAtIndex:index++] - 63; 
     result |= (b & 0x1f) << shift; 
     shift += 5; 
    } while (b >= 0x20); 
    NSInteger dlat = ((result & 1) ? ~(result >> 1) : (result >> 1)); 
    lat += dlat; 
    shift = 0; 
    result = 0; 
    do { 
     b = [encoded characterAtIndex:index++] - 63; 
     result |= (b & 0x1f) << shift; 
     shift += 5; 
    } while (b >= 0x20); 
    NSInteger dlng = ((result & 1) ? ~(result >> 1) : (result >> 1)); 
    lng += dlng; 
    NSNumber *latitude = [[NSNumber alloc] initWithFloat:lat * 1e-5] ; 
    NSNumber *longitude = [[NSNumber alloc] initWithFloat:lng * 1e-5] ; 
    printf("[%f,", [latitude doubleValue]); 
    printf("%f]", [longitude doubleValue]); 
    CLLocation *loc = [[CLLocation alloc] initWithLatitude:[latitude floatValue] longitude:[longitude floatValue]] ; 
    [array addObject:loc]; 
} 

return array; 
    } 

我應該做的。請建議。

Answer 1

您可以嘗試使用pathFromEncodedPath方法代替decodePolyLine從encodeString獲取路徑。

NSString *points=[[[latestRoutes objectAtIndex:0] objectForKey:@"overview_polyline"] objectForKey:@"points"]; 
polyline = [GMSPolyline polylineWithPath: [GMSPath pathFromEncodedPath: points]]; 
polyline.map = mapView; 
polyline.strokeColor = [UIColor colorWithRed:0/255.0 green:4/255.0 blue:255/255.0 alpha:1.0]; 
polyline.strokeWidth = 4.0f;