Creating an MKMapSnapshotter with an MKPolylineRenderer

Question

I thought iOS 7\'s MKMapSnapshotters would be a simple way to take a snapshot of an MKMapView, the benefit is that you can do it without loading th

Answer 1

Just had the same problem, this code seems to work:

UIImage * res = nil;
UIImage * image = snapshot.image;

UIGraphicsBeginImageContextWithOptions(image.size, YES, image.scale);
[image drawAtPoint:CGPointMake(0, 0)];

CGContextRef context = UIGraphicsGetCurrentContext();

CGContextSetStrokeColorWithColor(context,  [COLOR_FLASHBLUE CGColor]);
CGContextSetLineWidth(context,2.0f);
CGContextBeginPath(context);

CLLocationCoordinate2D coordinates[[polyline pointCount]];
[polyline getCoordinates:coordinates range:NSMakeRange(0, [polyline pointCount])];

for(int i=0;i<[polyline pointCount];i++)
{
    CGPoint point = [snapshot pointForCoordinate:coordinates[i]];

    if(i==0)
    {
        CGContextMoveToPoint(context,point.x, point.y);
    }
    else{
        CGContextAddLineToPoint(context,point.x, point.y);

    }
}

CGContextStrokePath(context);

res = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();