如何以编程方式为 swift 3 中的 barButtonItem 设置操作？

Question

这是我之前用的，

var barButtonItem = UIBarButtonItem(image: backImgs, style: UIBarButtonItemStyle.plain, target: self, action: Selector("menuButtonTapped:"))

但是 Swift 3.

有一些语法变化

Answer 1

例如：-

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

Answer 2

从 Swift 开始，您只需更改 selector 语法 3 您需要在函数调用中指定方法的第一个参数名称，因此请像这样更改您的选择器。

#selector(menuButtonTapped(sender:))

而你的方法应该是这样的。

func menuButtonTapped(sender: UIBarButtonItem) {

}

Answer 3

let barButtonItem = UIBarButtonItem(image: UIImage(named: "backImgs"),
                                            style: .plain,
                                            target: self,
                                            action: #selector(menuButtonTapped))

// Adding button to navigation bar (rightBarButtonItem or leftBarButtonItem)
self.navigationItem.rightBarButtonItem = barButtonItem

 // Private action
@objc fileprivate func menuButtonTapped() { // body method here }

Answer 4

Swift 3 for iOS 10.1 的一行代码：

navigationController?.navigationBar.topItem?.rightBarButtonItem = UIBarButtonItem(title: "Add", style: .plain, target: self, action: nil)

Answer 5

总结 Swift 3 中最常用的向 barButton 添加操作的方法。

带文本的条形按钮

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

带有您自己的图片的条形按钮

navigationItem.rightBarButtonItem = UIBarButtonItem(image: UIImage(named:"add"), style: .plain, target: self, action: #selector(addTapped))

带有系统图像的条形按钮

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

Answer 6

制作一个 UIBarButtonItem：

let rightButton: UIBarButtonItem = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.done, target: self, action: #selector(LocationViewController.doneButtonClicked(_:)))

添加到 NavigationItem：

self.navigationItem.rightBarButtonItem = rightButton

关联函数：

func doneButtonClicked(_ button:UIBarButtonItem!){    
    print("Done clicked")    
}

Answer 7

如果有人在使用 customView:

barButtonItem.customView?.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(onBarButtonItemClicked)))

Answer 8

为条形按钮项目创建一个扩展。

 extension UINavigationItem {
    func addSettingButtonOnRight(){
       let button = UIButton(type: .Custom)
       button.setTitle("setting", forState: .Normal)
       button.titleLabel?.font = UIFont.systemFontOfSize(15.0)
       button.layer.cornerRadius = 5
       button.backgroundColor = UIColor.grayColor()
       button.frame = CGRect(x: 0, y: 0, width: 100, height: 25)
       button.addTarget(self, action: #selector(gotSettingPage), forControlEvents: UIControlEvents.TouchUpInside)
       let barButton = UIBarButtonItem(customView: button)

       self.rightBarButtonItem = barButton
   }

   func gotSettingPage(){

   }
 }

并从 viewDidLoad() 调用它

 self.navigationItem.addSettingButtonOnRight()

Answer 9

在Swift3中，你可以这样添加UIBarButtonItem，

let addButton = UIBarButtonItem(image:UIImage(named:"your_icon_name"), style:.plain, target:self, action:#selector(YourControllerName.buttonAction(_:)))
addButton.tintColor = UIColor.white
self.navigationItem.rightBarButtonItem = addButton

然后像那样处理按钮操作，

func buttonAction(_ sender: UIBarButtonItem) {

}

希望对您有所帮助。

Answer 10

for Swift 4 添加 viewDidLoad:

navigationItem.rightBarButtonItem = UIBarButtonItem(
    barButtonSystemItem: UIBarButtonSystemItem.add, 
    target: self, 
    action: #selector(addTransaction)
)

Answer 11

如果有人正在寻找在现有按钮上设置操作的方法 (Swift 5)：

if let leftBarButtonItem = navigationItem.leftBarButtonItem {
    leftBarButtonItem.target = self
    leftBarButtonItem.action = #selector(onBack(_:))
}


@IBAction func onBack(_ sender: AnyObject) {
    _ = navigationController?.popViewController(animated: true)
}

Answer 12

在Swift5

//For righter button item
let rightBtn = UIBarButtonItem(image: UIImage(named: "rightmenu"), style: .plain, target: self, action: #selector(onClickMethod))//Change your function name and image name here
self.navigationItem.rightBarButtonItem = rightBtn
//self.navigationItem.rightBarButtonItem = [rightBtn, anotherBtn] //If you want to add more buttons add like this

//For left bar button item
let leftBtn = UIBarButtonItem(image: UIImage(named: "rightmenu"), style: .plain, target: self, action: #selector(onClickMethod)) //Change your function name and image name here
self.navigationItem.leftItemsSupplementBackButton = true
self.navigationItem.leftBarButtonItem = leftBtn
//self.navigationItem.leftBarButtonItems = [leftBtn, anotherBtn] //If you want to add more buttons add like this

//This is your function name
@objc func onClickMethod() {
    print("Left bar button item")
}

如何以编程方式为 swift 3 中的 barButtonItem 设置操作？

How to programmatically set action for barButtonItem in swift 3?

selector

uibarbuttonitem

ios

swift

swift3