swift - 我可以在 Swift 4 中将参数（不是发件人）附加到 uiButton.addTarget

Question

我是 iOS 开发的新手。请检查以下代码。

let dropDown = DropDown()

override func viewDidLoad() {
    super.viewDidLoad()

    dropDown.anchorView = dropDownTest // UIView or UIBarButtonItem
    dropDown.dataSource = ["Car", "Motorcycle", "Truck"]
    dropDown.bottomOffset = CGPoint(x: 0, y:(dropDown.anchorView?.plainView.bounds.height)!)
    dropDownTest.addTarget(self, action: #selector(self.buttonClicked(sender:)), for: .touchUpInside)
}

@objc private func buttonClicked(sender: UIButton) {
    dropDown.show()
}

这很容易，因为dropDown可以从buttonClicked方法调用变量。但是，就我而言，我必须在与表格单元相关的方法中执行此操作cellForRowAt。

        let cell = tableView.dequeueReusableCell(withIdentifier: "VarientCell", for: indexPath)

        let varientButtonTag = 1

        let varientButton = cell.viewWithTag(varientButtonTag) as! UIButton
        let varientDropDown = DropDown()
        varientDropDown.anchorView = varientButton
        varientDropDown.dataSource = datasource
        varientDropDown.bottomOffset = CGPoint(x: 0, y: varientButton.bounds.height)

        varientButton.addTarget(self, action: #selector(self.varientButtonClicked(sender:)), for: .touchUpInside)
        return cell

和按钮单击方法，

    @objc private func varientButtonClicked(sender: UIButton) {
       //dropDown.show() 
       // my problem is here.., i need to pass the dropDown somehow to show that. 
    }

标签： swiftuibutton

Answer 1

有很多方法可以做到这一点。我指的是两种可能的方法。1. 您可以继承 UIButton 并为其设置参数。

class MyButton: UIButton{

       var myParam1: String?
       var myParam2: String?

    }

2. 创建自定义表格视图单元格并处理里面的按钮调用

   导入 UIKit

   class MyCell: UITableViewCell{
       @IBOutlet weak var myButton: UIButton!
       @IBOutlet weak var anotherButton: UIButton!
       func setup(model: YourDataModel){
   
           myButton.addTarget(self, action:#selector(self.didSelect(_ :), for: .touchUpInside)
           anotherButton.addTarget(self, action: #selector(self.didSelect(_ :)), for: .touchUpInside)
       }
   
       @objc func didSelect(_ sender: UIButton){
           switch sender {
           case myButton:
               print("my button clicked")
           case anotherButton:
               print("anotherButton clicked")
           default:
               break
           }
       }
   }