Swift DropDown 使用 Cocoapods 错误，不起作用答案

【问题标题】：Swift DropDown using Cocoapods error, won't workSwift DropDown 使用 Cocoapods 错误，不起作用
【发布时间】：2019-11-25 09:53:19
【问题描述】：

我是 swift 新手，现在我正在尝试使用 cocoapods 在情节提要上创建一个下拉表。我已经按照 cocoapods 的所有教程进行操作，我猜我的代码有问题。请在这里给我一个启发，为什么它在我声明下拉列表的地方不起作用。

谢谢你们的帮助，谢谢你们。

import iOSDropDown

class ViewController: UIViewController {

    @IBOutlet weak var DropDownMenu: DropDown!
    let dropDown = DropDown()
    let view = UIView()
    dropDown.anchorView = view
    dropDown.optionArray = ["option 1", "option 2", "option 3"]

【问题讨论】：

标签： ios swift storyboard cocoapods

【解决方案1】：

override func viewDidLoad() {

    super.viewDidLoad()

    let dropDown = DropDown()
    let view = UIView()
    dropDown.anchorView = view // UIView or UIButton

    // For set direction .top, .bottom or .any(for automatic)
    dropDown.direction = .any 
    dropDown.optionArray = ["data 1", "data 2", "data 3"]

    // for custom cell you can set xib
    dropDown.cellNib = UINib(nibName: "MyCell", bundle: nil)

    // select item from dropdown
    dropDown.selectionAction = { [unowned self] (index: Int, item: String) in
       print("Selected item: \(item) at index: \(index)")
   }
   // if you want to set custom width then you can set.
   dropDownLeft.width = 200

   dropDown.show() // For Display Dropdown
   dropDown.hide() // For hide Dropdown
}

更多细节和功能可以参考https://github.com/AssistoLab/DropDown

【讨论】：

【解决方案2】：

在viewDidLoad中写入初始化代码：

override func viewDidLoad() {
    super.viewDidLoad()

    let dropDown = DropDown()
    let view = UIView()
    dropDown.anchorView = view
    dropDown.optionArray = ["option 1", "option 2", "option 3"]
}

【讨论】：

【解决方案3】：

import iOSDropDown

class ViewController: UIViewController,UITextFieldDelegate {

@IBOutlet weak var dropDown: DropDown!

override func viewDidLoad() {
    super.viewDidLoad()

    // The list of array to display. Can be changed dynamically
    dropDown.optionArray = ["Option 1", "Option 2", "Option 3"]
    //Its Id Values and its optional
    dropDown.optionIds = [1,23,54,22]

    // The the Closure returns Selected Index and String
    dropDown.didSelect{(selectedText , index ,id) in
    print("Selected String: \(selectedText) \n index: \(index)")
        self.dropDown.hideList()
        self.dropDown.text = selectedText
    }
}

}

func textFieldDidBeginEditing(_ textField: UITextField) {
            dropDown.showList()
}

}

你可以参考这个链接https://cocoapods.org/pods/iOSDropDown

【讨论】：

【解决方案4】：

第 1 步：添加 Pod 并安装

pod 'DropDown'

第 2 步：在 UIButton Tap 中添加下拉菜单

import UIKit
import DropDown

class ViewController: UIViewController {

let dropDown = DropDown()

override func viewDidLoad() {
super.viewDidLoad()
}

@IBAction func tapChooseItems(_ sender: UIButton) {
dropDown.dataSource = ["option 1", "option 2", "option 3"]
dropDown.anchorView = sender
dropDown.bottomOffset = CGPoint(x: 0, y: sender.frame.size.height)
dropDown.show()
dropDown.selectionAction = { [weak self] (index: Int, item: String) in
  guard let _ = self else { return }
  sender.setTitle(item, for: .normal)
   }
 }
}

第 3 步：在 UITableView 中添加下拉菜单

import UIKit
import DropDown

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

@IBOutlet weak var tableView: UITableView!
let dropDown = DropDown()

override func viewDidLoad() {
 super.viewDidLoad()
 }

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 10
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
cell.textLabel?.text = "Result: \(indexPath.row+1): "
return cell
}

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
if let cell = tableView.cellForRow(at: indexPath) {
  dropDown.dataSource = ["option 1", "option 2", "option 3"]
  dropDown.anchorView = cell
  dropDown.bottomOffset = CGPoint(x: 0, y: cell.frame.size.height)
  dropDown.backgroundColor = .gray
  dropDown.show()
  dropDown.selectionAction = { [weak self] (index: Int, item: String) in
    guard let _ = self else { return }
    cell.textLabel?.text = "Result: \(indexPath.row+1): \(item)"
    }
   }
  }
 }

【讨论】：