以编程方式在导航栏中的 UIBarButtonItem？

Question

我一直在寻找这个解决方案一段时间，但没有任何解决方案。 例如一种解决方案是

 self.navigationItem.setRightBarButtonItem(UIBarButtonItem(barButtonSystemItem: .Stop, target: self, action: nil), animated: true)

此代码将添加一个带有“停止”图像的按钮。 就像这样，还有其他“搜索”、“刷新”等解决方案。但是如果我想以编程方式添加一个带有我想要的图像的按钮怎么办？

Answer 1

不设置按钮框架的自定义按钮图像：

您可以使用init(image: UIImage?, style: UIBarButtonItemStyle, target: Any?, action: Selector?)使用指定的图像和其他属性初始化新项目。

let button1 = UIBarButtonItem(image: UIImage(named: "imagename"), style: .plain, target: self, action: Selector("action")) // action:#selector(Class.MethodName) for swift 3
self.navigationItem.rightBarButtonItem  = button1

检查此Apple 文档。 参考

---

带有自定义按钮图像的 UIBarButtonItem 使用按钮框架

适用于Swift 3.0

    let btn1 = UIButton(type: .custom)
    btn1.setImage(UIImage(named: "imagename"), for: .normal)
    btn1.frame = CGRect(x: 0, y: 0, width: 30, height: 30)
    btn1.addTarget(self, action: #selector(Class.Methodname), for: .touchUpInside)
    let item1 = UIBarButtonItem(customView: btn1)

    let btn2 = UIButton(type: .custom)
    btn2.setImage(UIImage(named: "imagename"), for: .normal)
    btn2.frame = CGRect(x: 0, y: 0, width: 30, height: 30)
    btn2.addTarget(self, action: #selector(Class.MethodName), for: .touchUpInside)
    let item2 = UIBarButtonItem(customView: btn2)  

    self.navigationItem.setRightBarButtonItems([item1,item2], animated: true)

---

适用于Swift 2.0及更早版本

let btnName = UIButton()
btnName.setImage(UIImage(named: "imagename"), forState: .Normal)
btnName.frame = CGRectMake(0, 0, 30, 30)
btnName.addTarget(self, action: Selector("action"), forControlEvents: .TouchUpInside)

//.... Set Right/Left Bar Button item
let rightBarButton = UIBarButtonItem()
rightBarButton.customView = btnName
self.navigationItem.rightBarButtonItem = rightBarButton

或者简单地使用init(customView:) 之类的

 let rightBarButton = UIBarButtonItem(customView: btnName) self.navigationItem.rightBarButtonItem = rightBarButton

---

对于系统 UIBarButtonItem

let camera = UIBarButtonItem(barButtonSystemItem: .Camera, target: self, action: Selector("btnOpenCamera"))
self.navigationItem.rightBarButtonItem = camera

---

要设置超过 1 个项目，请使用rightBarButtonItems或左侧leftBarButtonItems

let btn1 = UIButton()
btn1.setImage(UIImage(named: "img1"), forState: .Normal)
btn1.frame = CGRectMake(0, 0, 30, 30)
btn1.addTarget(self, action: Selector("action1:"), forControlEvents: .TouchUpInside)
let item1 = UIBarButtonItem()
item1.customView = btn1

let btn2 = UIButton()
btn2.setImage(UIImage(named: "img2"), forState: .Normal)
btn2.frame = CGRectMake(0, 0, 30, 30)
btn2.addTarget(self, action: Selector("action2:"), forControlEvents: .TouchUpInside)
let item2 = UIBarButtonItem()
item2.customView = btn2

self.navigationItem.rightBarButtonItems = [item1,item2]

使用setLeftBarButtonItem或setRightBarButtonItem

let btn1 = UIButton()
btn1.setImage(UIImage(named: "img1"), forState: .Normal)
btn1.frame = CGRectMake(0, 0, 30, 30)
btn1.addTarget(self, action: Selector("action1:"), forControlEvents: .TouchUpInside)
self.navigationItem.setLeftBarButtonItem(UIBarButtonItem(customView: btn1), animated: true);

对于 swift >= 2.2 action 应该是#selector(Class.MethodName) ... 例如btnName.addTarget(self, action: #selector(Class.MethodName), forControlEvents: .TouchUpInside)

Answer 2

使用Swift 4或Swift 4.2更容易

在您的ViewDidLoad方法中，定义您的按钮并将其添加到导航栏。

override func viewDidLoad() {
    super.viewDidLoad()

    let logoutBarButtonItem = UIBarButtonItem(title: "Logout", style: .done, target: self, action: #selector(logoutUser))
    self.navigationItem.rightBarButtonItem  = logoutBarButtonItem

}

那么你需要定义你在 action 参数中提到的函数，如下所示

@objc func logoutUser(){
     print("clicked")
}

您需要添加@objc前缀，因为它仍在使用遗留的东西（目标 C）。

Answer 3

只需设置UIBarButtonItem与customView

例如：

  var leftNavBarButton = UIBarButtonItem(customView:yourButton)
  self.navigationItem.leftBarButtonItem = leftNavBarButton

或使用setFunction ：

  self.navigationItem.setLeftBarButtonItem(UIBarButtonItem(customView: yourButton), animated: true);

Answer 4

我偶然发现了这个问题，这里是 Swift 3 和 iOS 10 的更新：

let testUIBarButtonItem = UIBarButtonItem(image: UIImage(named: "test.png"), style: .plain, target: self, action: nil)
self.navigationItem.rightBarButtonItem  = testUIBarButtonItem

它绝对比创建具有所有属性的 UIButton 然后将 customView 添加到 UIBarButtonItem 快得多。

如果您想将图像的颜色从默认的蓝色更改为例如白色，您可以随时更改色调颜色：

test.tintColor = UIColor.white()

PS您显然应该为您的应用更改选择器等:)

Answer 5

在 Swift 3.0+ 中， UIBarButtonItem编程方式设置如下：

   override func viewDidLoad() {
        super.viewDidLoad()
        let testUIBarButtonItem = UIBarButtonItem(image: UIImage(named: "test.png"), style: .plain, target: self, action: #selector(self.clickButton))
        self.navigationItem.rightBarButtonItem  = testUIBarButtonItem
    }

   @objc func clickButton(){
            print("button click")
     }

Answer 6

使用原始图像设置 LeftBarButton。

let menuButton = UIBarButtonItem(image: UIImage(named: "imagename").withRenderingMode(.alwaysOriginal), style: .plain, target: self, action: #selector(classname.functionname))
self.navigationItem.leftBarButtonItem  = menuButton

Answer 7

我有同样的问题，我已经阅读了另一个主题的答案，然后我解决了另一种类似的方法。 我不知道哪个更有效。 类似的问题

//play button

@IBAction func startIt(sender: AnyObject) {
    startThrough();
};

//play button

func startThrough() {
    timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("updateTime"), userInfo: nil, repeats: true);

    let pauseButton = UIBarButtonItem(barButtonSystemItem: .Pause, target: self, action: "pauseIt");
    self.toolBarIt.items?.removeLast();
    self.toolBarIt.items?.append( pauseButton );
}

func pauseIt() {
    timer.invalidate();

    let play = UIBarButtonItem(barButtonSystemItem: .Play, target: self, action: "startThrough");
    self.toolBarIt.items?.removeLast();
    self.toolBarIt.items?.append( play );
}

Answer 8

iOS 11

使用约束设置自定义按钮：

let buttonWidth = CGFloat(30)
let buttonHeight = CGFloat(30)

let button = UIButton(type: .custom)
button.setImage(UIImage(named: "img name"), for: .normal)
button.addTarget(self, action: #selector(buttonTapped(sender:)), for: .touchUpInside)
button.widthAnchor.constraint(equalToConstant: buttonWidth).isActive = true
button.heightAnchor.constraint(equalToConstant: buttonHeight).isActive = true

self.navigationItem.rightBarButtonItem = UIBarButtonItem.init(customView: button)

Answer 9

这是苹果的疯狂之举。 当你说 self.navigationItem.rightBarButtonItem.title 然后它会说 nil 而在 GUI 上它显示编辑或保存。 Fresher like me 会花很多时间来调试这种行为。

有一个要求，项目将在第一次加载中显示编辑，然后用户点击它会更改为保存标题。 为了归档这个，我做了如下。

//view did load 会说编辑标题

private func loadRightBarItem() {
    let logoutBarButtonItem = UIBarButtonItem(title: "Edit", style: .done, target: self, action: #selector(handleEditBtn))
    self.navigationItem.rightBarButtonItem  = logoutBarButtonItem
}

// 点击编辑项目将更改为保存标题

@objc private func handleEditBtn() {
    print("clicked on Edit btn")
    let logoutBarButtonItem = UIBarButtonItem(title: "Save", style: .done, target: self, action: #selector(handleSaveBtn))
    self.navigationItem.rightBarButtonItem  = logoutBarButtonItem
    blockEditTable(isBlock: false)
}

//点击保存项目将显示编辑标题

@objc private func handleSaveBtn(){
    print("clicked on Save btn")
    let logoutBarButtonItem = UIBarButtonItem(title: "Edit", style: .done, target: self, action: #selector(handleEditBtn))
    self.navigationItem.rightBarButtonItem  = logoutBarButtonItem

    saveInvitation()
    blockEditTable(isBlock: true)

}

Answer 10

适用于 Swift 5+

let searchBarButtonItem = UIBarButtonItem(image: UIImage(named: "searchIcon"), style: .plain, target: self, action: #selector(onSearchButtonClicked))
        self.navigationItem.rightBarButtonItem  = searchBarButtonItem

@objc func onSearchButtonClicked(_ sender: Any){
    print("SearchButtonClicked")
}

Answer 11

func viewDidLoad(){
let homeBtn: UIButton = UIButton(type: UIButtonType.custom)

        homeBtn.setImage(UIImage(named: "Home.png"), for: [])

        homeBtn.addTarget(self, action: #selector(homeAction), for: UIControlEvents.touchUpInside)

        homeBtn.frame = CGRect(x: 0, y: 0, width: 30, height: 30)

        let homeButton = UIBarButtonItem(customView: homeBtn)


        let backBtn: UIButton = UIButton(type: UIButtonType.custom)

        backBtn.setImage(UIImage(named: "back.png"), for: [])

        backBtn.addTarget(self, action: #selector(backAction), for: UIControlEvents.touchUpInside)

        backBtn.frame = CGRect(x: -10, y: 0, width: 30, height: 30)

        let backButton = UIBarButtonItem(customView: backBtn)
        self.navigationItem.setLeftBarButtonItems([backButton,homeButton], animated: true)
}

}

Answer 12

除了以上内容，您还可以在 ios14 及以上版本中使用以下内容

   if #available(iOS 14.0, *) {
        let closeAction = UIAction(handler: { [weak self] _ in
           //perform action here
        })
        let closeBarButtonItem = UIBarButtonItem(systemItem: .close, primaryAction: closeAction, menu: nil)
        navigationItem.rightBarButtonItem  = closeBarButtonItem
    }