以编程方式在导航栏中的UIBarButtonItem？

问题描述 投票：106回答：9

我一直在寻找这个解决方案一段时间但没有得到任何解决方案。例如，一种解决方案

 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，还有其他解决方案，“搜索”，刷新“等等。但是，如果我想以编程方式添加按钮，我想要的图像怎么办？

ios swift uibarbuttonitem navigationbar
9个回答
309
投票

不设置按钮框的自定义按钮图像：

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

检查这个Apple Doc. reference

UIBarButtonItem使用按钮框架自定义按钮图像

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)

对于Swift 2.0和更老

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

或者只是使用init(customView:)之类的

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

对于System UIBarButtonItem

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

设置超过1个项目使用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，动作应该是#selector(Class.MethodName) ...例如btnName.addTarget(self, action: #selector(Class.MethodName), forControlEvents: .TouchUpInside)

23
投票

使用Swift 4或Swift 4.2会更容易

在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，因为它仍然使用遗留的东西（目标C）。

17
投票

只需使用customView设置UIBarButtonItem即可

例如：

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

或使用setFunction：

  self.navigationItem.setLeftBarButtonItem(UIBarButtonItem(customView: yourButton), animated: true);
11
投票

我只是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

它肯定比使用所有属性创建UIButton然后随后将customView添加到UIBarButtonItem快得多。

如果你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你应该明显改变你的应用程序的选择器等:)

5
投票

在快捷方式3中，在按钮栏中执行操作：

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

func clickButton(){
        print("button click")
    }
2
投票

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

//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 );
}
2
投票

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
0
投票
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)
}

}
0
投票

这是一个疯狂的苹果。当你说self.navigationItem.rightBarButtonItem.title然后它会在GUI上显示nil时显示编辑或保存。 Fresher喜欢我将花费大量时间来调试这种行为。

要求项目在第一次加载时显示编辑，然后用户点击它将更改为保存标题。为了存档，我做了如下。

//查看加载会说编辑标题

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)

}
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