iOS 地图截屏

- (nullable UIImage *)generateSnapshot:(CGSize)size
{
self.addressLabelBg.hidden = YES;
self.addressLabel.hidden = YES;
self.mapView.showsUserLocation = NO;

CGPoint mapCenter = self.mapView.center;
UIGraphicsBeginImageContextWithOptions(size, NO, 0.0f);
[self.mapView drawViewHierarchyInRect:CGRectMake(-(mapCenter.x - size.width / 2),
-(mapCenter.y - size.height / 2),
self.mapView.bounds.size.width,
self.mapView.bounds.size.height)
afterScreenUpdates:YES];
UIImage *snapshotImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

self.addressLabelBg.hidden = NO;
self.addressLabel.hidden = NO;
self.mapView.showsUserLocation = YES;

return snapshotImage;
}