SVProgressHUD 到指定位置

UIOffset offset;    CGFloat hx = currentIV.center.y - [UIScreen mainScreen].bounds.size.height / 2 + self.navigationController.navigationBar.h + 44 ;    CGFloat vx = currentIV.center.x - [UIScreen mainScreen].bounds.size.width / 2;    offset = UIOffsetMake(vx, hx);