UIWindow

UIWindow *window = [UIApplication sharedApplication].keyWindow;

    self.qrView.imageView_teamQR = [self.qrView.imageView_teamQR createQRImgView:nil InserString:[NSString stringWithFormat:@"T%@",self.team_id]];

    [self.bgView addSubview:self.qrView];

    [windowaddSubview:self.bgView];