ios Swift 3.0 向导航栏添加右键

Swift 3.0 Adding a Right Button to Navigation Bar

提问by Kevin

I have added a navigation bar to the top of a view controller. I am trying to control whether a button is visible based a condition, but I am having trouble adding the button. So far I have,

我在视图控制器的顶部添加了一个导航栏。我试图根据条件控制按钮是否可见，但我在添加按钮时遇到了问题。到目前为止，我有，

var addButton: UIBarButtonItem = UIBarButtonItem(title: "test", style: .done, target: self, action: #selector(addTapped))

override func viewDidLoad() {
    super.viewDidLoad()

    let boool = true
    if boool {
        self.navigationItem.rightBarButtonItem = self.addButton
    }
    else {
        self.navigationItem.rightBarButtonItem = nil
    }
}

func addTapped(sender: AnyObject) {
    print("hjxdbsdhjbv")
}

I believe it is not working properly because I have added a navigation bar into the VC, instead of using a navigation controller and working with the bar there. I was wondering if there was a way to work with this navigation bar.

我相信它不能正常工作，因为我在 VC 中添加了一个导航栏，而不是使用导航控制器并在那里使用导航栏。我想知道是否有办法使用此导航栏。

采纳答案by Kyle H

You say you added a UINavigationBarto your view controller via storyboard, but looking at the code you provided there is no outlet connection to your navigation bar in IB.

您说您UINavigationBar通过情节提要向视图控制器添加了 a ，但是查看您提供的代码，IB 中的导航栏没有出口连接。

In order to access self.navigationItemyour view controller must be embedded in a UINavigationControlleror be part of a hierarchy which is. Unless you have a need for a custom navigation bar on an individual view controller, I suggest removing that from Interface Builder, then making sure either the view controller in question is embedded in a UINavigationControlleror it is being pushed onto the navigation stack from another controller which is embedded in a navigation controller and then you should see your UIBarButtonItem.

为了访问self.navigationItem您的视图控制器必须嵌入到UINavigationController层次结构中或成为层次结构的一部分。除非您需要在单个视图控制器上自定义导航栏，否则我建议将其从 Interface Builder 中删除，然后确保有问题的视图控制器嵌入在 a 中，UINavigationController或者从另一个控制器推送到导航堆栈上嵌入在导航控制器中，然后您应该会看到您的UIBarButtonItem.

回答by Mannopson

It's simple. Put this line of code to the viewDidLoad:

这很简单。把这行代码放到viewDidLoad：

self.navigationItem.rightBarButtonItem = UIBarButtonItem(title: "test", style: .done, target: self, action: #selector(addTapped))

Updated for Swift 4or later:

为 Swift 4或更高版本更新：

A custom function:

自定义函数：

@objc func action(sender: UIBarButtonItem) {
    // Function body goes here
}

(Custom) Right bar button item:

（自定义）右侧栏按钮项：

self.navigationItem.rightBarButtonItem = UIBarButtonItem.init(title: "some_text", style: .done, target: self, action: #selector(self.action(sender:)))

(Custom) Left bar button item:

（自定义）左栏按钮项：

self.navigationItem.leftBarButtonItem = UIBarButtonItem.init(title: "some_text", style: .done, target: self, action: #selector(self.action(sender:)))

Also you can add a system bar button items something like this: UIBarButtonItem.SystemItemDefines system-supplied images for bar button items: .add, .done, .cancel, .edit, .save, .compose, .reply, .organizeand more.

您还可以添加系统栏按钮项目，如下所示：UIBarButtonItem.SystemItem为栏按钮项目定义系统提供的图像：.add、.done、.cancel、.edit、.save、.compose、.reply、.organize等。

(System) Right bar button item:

（系统）右侧栏按钮项：

self.navigationItem.rightBarButtonItem = UIBarButtonItem.init(barButtonSystemItem: UIBarButtonItem.SystemItem.add, target: self, action: #selector(self.action(sender:)))

(System) Left bar button item:

（系统）左栏按钮项：

self.navigationItem.leftBarButtonItem = UIBarButtonItem.init(barButtonSystemItem: UIBarButtonItem.SystemItem.add, target: self, action: #selector(self.action(sender:)))

回答by Urvish Modi

let rightBarButtonItem = UIBarButtonItem.init(image: UIImage(named: "EditImage"), style: .done, target: self, action: #selector(ViewController.call_Method))

self.navigationItem.rightBarButtonItem = rightBarButtonItem

回答by ikbal

Swift 4.2;

斯威夫特 4.2；

Add viewController

添加 viewController

override func viewDidLoad() {
        super.viewDidLoad()
        self.addNavigationBarButton(imageName: "ic_back", direction:.left)
 }

Add Classyour API or Utility Class

添加Class您的 API 或实用程序类

public func addNavigationBarButton(imageName:String,direction:direction){
    var image = UIImage(named: imageName)
    image = image?.withRenderingMode(.alwaysOriginal)
    switch direction {
    case .left:
        self.navigationItem.leftBarButtonItem = UIBarButtonItem(image: image, style:.plain, target: nil, action: #selector(goBack))
    case .right:
        self.navigationItem.rightBarButtonItem = UIBarButtonItem(image: image, style:.plain, target: nil, action: #selector(goBack))
    }
}

@objc public func goBack() {
    self.navigationController?.popViewController(animated: true)
}

public enum direction {
    case right
    case left
}

回答by Stefan S

Firstly, you need to connect you navigation bar to an IBOutlet so that you can refer to it in your code. After that, this code should work:

首先，您需要将导航栏连接到 IBOutlet，以便您可以在代码中引用它。之后，此代码应该可以工作：

    let navigationItem = UINavigationItem(title: "Title")
    navigationItem.rightBarButtonItem = self.addButton
    navigationItem.hidesBackButton = true
    self.navigationBar.pushItem(navigationItem, animated: false)

回答by akr ios

tested in Xcode 10.2, swift 5.0; First, I have have embedded my ViewController in UINavigationController in IB. Then in ViewDidLoad include these lines

在 Xcode 10.2、swift 5.0 中测试；首先，我已经在 IB 的 UINavigationController 中嵌入了我的 ViewController。然后在 ViewDidLoad 中包含这些行

self.title = "orange"
 self.navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(changeLayout)).

Note - accessing title, or adding button through navigation controller did not work. For example : setting title - Self.navigationcontroller.navigationItem.title did not work ,

注意 - 通过导航控制器访问标题或添加按钮不起作用。例如：设置标题-Self.navigationcontroller.navigationItem.title 不起作用，