【ios开发】导航栏添加左右按钮出现右移的解决方案

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解决导航栏，添加按钮，布局右移的问题

  let spaceButtonItem = UIBarButtonItem.init(barButtonSystemItem: .fixedSpace, target: self, action: nil);
        spaceButtonItem.width = -15;


        let leftBtn = UIButton.init(type: .custom);
        leftBtn.setTitle("返回", for: .normal);
        leftBtn.setImage(UIImage.init(named: "icon_back"), for: .normal);
        leftBtn.setTitleColor(UIColor.black, for: .normal);
        leftBtn.frame = CGRect(x: -20, y: 0, width: 60, height: 44)
        let leftItem = UIBarButtonItem.init(customView: leftBtn);
        leftItem.width = -15;
        leftItem.style = UIBarButtonItemStyle.plain;
        leftBtn.addTarget(self, action: #selector(gobackVC(sender:)), for: .touchUpInside);
//        self.navigationItem.leftBarButtonItem = leftItem
        self.navigationItem.leftBarButtonItems = [spaceButtonItem,leftItem];

        let spaceButtonItem1 = UIBarButtonItem.init(barButtonSystemItem: .fixedSpace, target: self, action: nil);
        spaceButtonItem1.width = -15;

        let rightBTN = UIButton.init(type: .custom);
        rightBTN.setTitle("关闭", for: .normal);
        rightBTN.setTitleColor(UIColor.black, for: .normal);
//        rightBTN.setImage(UIImage.init(named: "iconz-add_photo"), for: .normal);
        rightBTN.imageView?.contentMode = .center;
        rightBTN.frame = CGRect(x: 20, y: 0, width: 60, height: 40)
        rightBTN.addTarget(self, action: #selector(dismissVC(sender:)), for: .touchUpInside);
        let rightItem = UIBarButtonItem.init(customView: rightBTN);
        self.navigationItem.rightBarButtonItems = [spaceButtonItem1,rightItem];

注：leftItem.width = -15; 可以根据具体情况调整