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，因为可以从dropDown方法中调用变量buttonClicked。但是，就我而言，我必须在与表格单元相关的方法cellForRowAt中进行此操作。

        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

和单击按钮的方法

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

Answer 1

有很多方法可以做到这一点。我指出了两种可能的方式。 1.您可以继承UIButton并为其添加参数。

class MyButton: UIButton{

       var myParam1: String?
       var myParam2: String?

    }

创建自定义表格视图单元并处理内部的按钮调用

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
        }
    }
}

我可以在Swift 4中将参数（不是发送方）附加到uiButton.addTarget上吗

1 个答案: