ios - LeftBarButtonItem 位置不正确

Question

我正在尝试像这样添加一个 leftbarbuttonitem:

使用此代码:

let button = UIButton.init(type: .custom)
        button.setImage(UIImage.init(named: "WhiteBackButton.png"), for: UIControlState.normal)
        button.addTarget(self, action:#selector(self.backButtonSelected), for: UIControlEvents.touchUpInside)
        button.frame = CGRect.init(x: 0, y: 0, width: 30, height: 30)
        let barButton = UIBarButtonItem.init(customView: button)
        self.navigationItem.leftBarButtonItem = barButton

我正在使用这张图片:

它看起来像这样被推过去:

如何阻止它从左侧推得太远？

Answer 1

let negativeSpacer:UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.fixedSpace, target: nil, action: nil)
        negativeSpacer.width = -10
        self.navigationItem.leftBarButtonItems = [negativeSpacer, leftBarButton]