我想在UINavigationController中使用Logo作为LeftbarButtonItem,是否可以在此处删除左侧填充?我已经试过了:letlogoView=UIView(frame:CGRectMake(-15,0,44,44))logoView.backgroundColor=UIColor.darkGrayColor()varleftBarButtonItem:UIBarButtonItem=UIBarButtonItem(customView:logoView)self.navigationItem.setLeftBarButtonItem(leftBarButto