小编Far*_*ohi的帖子

我想使用自定义视图 作为 UINavigationController 中留下的 UIBarButtonItem，是否可以删除此处的左侧填充？

我已经尝试过了：

let  btn = UIButton()
btn.frame = CGRect(x: -50, y: -50, width: 44, height: 50)
btn.setImage(UIImage(name:"img").withRenderingMode(.alwaysTemplate), for: .normal)
btn.addTarget(self, action: #selector(openSetting), for: .touchUpInside)

let leftButtonBar = UIBarButtonItem(customView: btn)

self.navigationItem.leftBarButtonItems = ( [leftButtonBar , otherBtn ])

如何删除剩余空间设置图标

更新。厌倦了这段代码：

let view = UIView(frame: CGRect(x: 0, y: 0, width: 50, height: 
view.backgroundColor = .gray
let  btn = UIButton()
btn.frame = CGRect(x: -15, y: 0, width: 44, height: 50)
btn.setImage(UIImage(name:"img").withRenderingMode(.alwaysTemplate), for: .normal)
btn.addTarget(self, action: #selector(DashboardTabBarController.openSetting), for: .touchUpInside) …

我想在可见性GONE和VISIBLE. 这在Android开发中确实很容易实现，但我不知道如何在Swift中使用相同的方法

我尝试使用此代码将标签设置为消失：

// set the width constraint to 0
let widthConstraint = NSLayoutConstraint(item:  self.labelShortDescription, attribute: NSLayoutAttribute.width, relatedBy: NSLayoutRelation.equal, toItem: nil, attribute: NSLayoutAttribute.notAnAttribute, multiplier: 1, constant: 0)
self.labelShortDescription.addConstraint(widthConstraint)

// set the height constraint to 0
let heightConstraint = NSLayoutConstraint(item:  self.labelShortDescription, attribute: NSLayoutAttribute.height, relatedBy: NSLayoutRelation.equal, toItem: nil, attribute: NSLayoutAttribute.notAnAttribute, multiplier: 1, constant: 0)
self.labelShortDescription.addConstraint(heightConstraint)