如何删除 UIBarButtonItem 左侧的填充？

Question

I would like to use a custom View as UIBarButtonItem left in an UINavigationController, is it possible to remove the left padding here?

Ill alrady tried:

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 ])

how to remove space left setting icon

update . tired this code:

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)
view.addSubview(btn)
let leftButtonBar = UIBarButtonItem(customView: view)

problem this user when clicked btn setting user and other problem title navigation not center align

Answer 1

You should have noticed that whatever x value you provide to your custom view ie, btn , it will always start from the same position because internally navigation bar doesn't count for position provided for that item and it always set the internally defined position as in below image, I set the background color to the custom button for better visuals.

So, the trick here is to put your custom button into another container view as below,

let view = UIView(frame: CGRect(origin: .zero, size: CGSize(width: 200, height: 50)))
view.backgroundColor = .green
let  btn = UIButton(frame: CGRect(x: -10, y: 10 , width: 30, height: 30))
btn.setImage(UIImage(named: "cancelled")?.withRenderingMode(.alwaysTemplate), for: .normal)
btn.addTarget(self, action: #selector(openSetting), for: .touchUpInside)
btn.backgroundColor = .yellow
btn.tintColor = .red
view.addSubview(btn)

let  btn2 = UIButton(frame: CGRect(x: 20, y: 10, width: 30, height: 30))
btn2.setImage(UIImage(named: "cancelled")?.withRenderingMode(.alwaysTemplate), for: .normal)
btn2.contentMode = .scaleAspectFit
btn2.tintColor = .yellow
btn2.addTarget(self, action: #selector(openSetting), for: .touchUpInside)
view.addSubview(btn2)

let itemsContainer = UIBarButtonItem(customView: view)
self.navigationItem.leftBarButtonItems = [itemsContainer]

This will result into this,

Now, if you change the x , y , width , height of btn , it will adjust accordingly.

Answer 2

Please try this. It works fine for me. If this code not working properly then I will give you another solution.

   let view = UIView(frame: CGRect(x: 0, y: 0, width: 50, height: 50))
    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(openSetting), for: .touchUpInside)
    view.addSubview(btn)
    let leftButtonBar = UIBarButtonItem(customView: view)
    self.navigationItem.leftBarButtonItems = ( [leftButtonBar])

Please add other button in View and set the width of view accordingy.It may hepls to you.Thank you

Answer 3

将 cRect 的 x 值设置为零：

btn.frame = CGRect(x: 0, y: -50, width: 44, height: 50)

Answer 4

You can set imageInsets and set image this is example of left margin to set back image on position of default back button

 let rightBtn = UIBarButtonItem(image: UIImage(named: "BackArrow"), style: .done, target: self, action: #selector(actnClose))
 rightBtn.imageInsets = UIEdgeInsets(top: 0, left: -12, bottom: 0, right: 0)
    
 self.navigationItem.setLeftBarButton(rightBtn, animated: true)

Answer 5

The less painful and actually cleanest solution was to hide the left button and just add a subview directly to the navigationBar and customise it's position and size with the good old constraints. Worked like a charm. Haven't tested it in every situation but seems to work fine.