UIBarButtonItem以编程方式在导航栏中？

我一直在寻找这种解决方案已有一段时间，但没有任何解决方案。例如一个解决方案是

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

此代码将添加带有“停止”图像的按钮。就像这样，还有其他解决方案，例如“搜索，刷新”等。但是，如果我想以编程方式在想要的图像上添加按钮，该怎么办？

自定义按钮图片，未设置按钮框：

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

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

UIBarButtonItem具有使用按钮框架的自定义按钮图像

对于 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)

FOR Swift 2.0及以上

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

或者干脆使用的init（customView :)喜欢

 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

如果要设置多于1个项目，请使用rightBarButtonItems或用于左侧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> = 2.2的快速动作#selector(Class.MethodName)，例如btnName.addTarget(self, action: #selector(Class.MethodName), forControlEvents: .TouchUpInside)

使用它要容易得多 Swift 4或Swift 4.2

在您的ViewDidLoad方法内部，定义您的按钮并将其添加到导航栏中。

override func viewDidLoad() {
    super.viewDidLoad()

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

}

那么您需要定义在action参数内提到的函数，如下所示

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

您需要添加@objc前缀，因为它仍在使用旧版东西（目标C）。

只需UIBarButtonItem使用customView进行设置

例如：

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

或使用setFunction：

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

我偶然发现了这个问题，这是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

绝对比使用所有属性创建UIButton，然后将customView添加到UIBarButtonItem快得多。

并且，如果您要将图像的颜色从默认的蓝色更改为例如白色，则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：）

在Swift 3.0+中，以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")
     }

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

我遇到了同样的问题，并且在其他主题中读了答案，然后又解决了另一种相似的方式。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 );
}

这是苹果的疯子。当您说出self.navigationItem.rightBarButtonItem.title时，它会说nil，而在GUI上则显示Edit或Save。像我这样的新生会花很多时间来调试此行为。

有一项要求，该项目将在首次加载中显示“编辑”，然后用户点击它。它将变为“保存标题”。为了存档，我做了如下。

//加载后的视图会显示“编辑标题”

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

//点按“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)

}

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)

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)
}

}