arrays - 尝试根据在另一个下拉菜单中选择的值快速过滤一个下拉菜单中的值-6ren

arrays - 尝试根据在另一个下拉菜单中选择的值快速过滤一个下拉菜单中的值

转载作者：行者123 更新时间：2023-11-28 07:27:23

我有两个下拉菜单，一个包含汽车品牌，一个包含汽车型号。当我选择汽车品牌时，是否可以过滤模型下拉列表中的值以仅显示与该特定品牌对应的值？

目前，当我从菜单中选择汽车品牌时，标题值将更改为所选的任何内容。我曾尝试将此值用作过滤模型选项的参数，但没有成功。希望我已经说得够清楚了:)

import UIKit

class ViewController: UIViewController {

 ////Set up buttons

var makeButton = makeDropDownBtn()
var modelButton = modelDropDownBtn()


override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically 
   from a nib.


    makeButton = makeDropDownBtn.init(frame: CGRect(x: 0, y: 0,   
 width: 0, height: 0))
    makeButton.setTitle("Select Make", for: .normal)
    makeButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 
    17)
    makeButton.translatesAutoresizingMaskIntoConstraints = false

    self.view.addSubview(makeButton)


    makeButton.centerXAnchor.constraint(equalTo: 
 self.view.centerXAnchor).isActive = true
    makeButton.centerYAnchor.constraint(equalTo: 
self.view.centerYAnchor, constant: -300).isActive = true

    makeButton.widthAnchor.constraint(equalToConstant: 
450).isActive = true
    makeButton.heightAnchor.constraint(equalToConstant:
 50).isActive = true

 makeButton.makeDropView.dropDownOptions = carMake

    modelButton = modelDropDownBtn.init(frame: CGRect(x: 0, y: 0, 
width: 0, height: 0))
    modelButton.setTitle("Select Model", for: .normal)
    modelButton.titleLabel?.font = UIFont.boldSystemFont(ofSize:
 17)
    modelButton.translatesAutoresizingMaskIntoConstraints = false

    self.view.addSubview(modelButton)

    modelButton.centerXAnchor.constraint(equalTo: 
   self.view.centerXAnchor).isActive = true
    modelButton.centerYAnchor.constraint(equalTo: 
   self.view.centerYAnchor, constant: -240).isActive = true

    modelButton.widthAnchor.constraint(equalToConstant: 
    450).isActive = true
    modelButton.heightAnchor.constraint(equalToConstant:  
    50).isActive = true

    modelButton.modelDropView.modelDropDownOptions = carModel
    }

   }
  protocol makeDropDownProtocol {
    func makeDropDownPressed(string: String)

  }

  protocol modelDropDownProtocol {
  func modelDropDownPressed(string: String)
  }



  class modelDropDownBtn: UIButton, modelDropDownProtocol {
  func modelDropDownPressed(string: String) {
    self.setTitle(string, for: .normal)
    self.dismissModelDropDown()
  }


  var modelDropView = modelDropDownView()
  var modelheight = NSLayoutConstraint()

  override init(frame: CGRect) {
    super.init(frame:frame)

    self.backgroundColor = UIColor(red: 52/255, green: 49/255, 
   blue: 78/255, alpha: 1)

    modelDropView = modelDropDownView.init(frame: CGRect(x: 0, y: 
   0, width: 0, height: 0  ))
    modelDropView.modelDelegate = self
    modelDropView.translatesAutoresizingMaskIntoConstraints = 
  false


  }

override func didMoveToSuperview() {

    self.superview?.addSubview(modelDropView)
    self.superview?.bringSubviewToFront(modelDropView)

    modelDropView.topAnchor.constraint(equalTo:  
  self.bottomAnchor).isActive = true
    modelDropView.centerXAnchor.constraint(equalTo:
  self.centerXAnchor).isActive = true
    modelDropView.widthAnchor.constraint(equalTo: 
self.widthAnchor).isActive = true
    modelheight =  
 modelDropView.heightAnchor.constraint(equalToConstant: 0)

}

var isOpen = false

override func touchesBegan(_ touches: Set<UITouch>, with event: 
UIEvent?) {
    if isOpen == false {

        isOpen = true

        NSLayoutConstraint.deactivate([self.modelheight])

        if self.modelDropView.modelTableView.contentSize.height > 
150 {
        self.modelheight.constant = 150
        } else {
            self.modelheight.constant = 
self.modelDropView.modelTableView.contentSize.height
        }

        NSLayoutConstraint.activate([self.modelheight])

        UIView.animate(withDuration: 0.5, delay: 0, 
usingSpringWithDamping: 0.5, initialSpringVelocity: 0.5, options: 
.curveEaseInOut, animations: {
            self.modelDropView.layoutIfNeeded()
            self.modelDropView.center.y += 
self.modelDropView.frame.height / 2
        }, completion: nil)
    } else {

isOpen = false

        NSLayoutConstraint.deactivate([self.modelheight])
        self.modelheight.constant = 0
        NSLayoutConstraint.activate([self.modelheight])

        UIView.animate(withDuration: 0.5, delay: 0, 
  usingSpringWithDamping: 0.5, initialSpringVelocity: 0.5, 
options: .curveEaseInOut, animations: {
            self.modelDropView.center.y -= 
self.modelDropView.frame.height / 2
            self.modelDropView.layoutIfNeeded()
        }, completion: nil)
    }
}

func dismissModelDropDown() {

    isOpen = false

    NSLayoutConstraint.deactivate([self.modelheight])
    self.modelheight.constant = 0
    NSLayoutConstraint.activate([self.modelheight])

    UIView.animate(withDuration: 0.5, delay: 0, 
usingSpringWithDamping: 0.5, initialSpringVelocity: 0.5, options:
.curveEaseInOut, animations: {
        self.modelDropView.center.y -= 
self.modelDropView.frame.height / 2
        self.modelDropView.layoutIfNeeded()
    }, completion: nil)
}

required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}
}

class makeDropDownBtn: UIButton, makeDropDownProtocol {

func makeDropDownPressed(string: String) {
    self.setTitle(string, for: .normal)
    self.dismissMakeDropDown()
}


var makeDropView = makeDropDownView()

var height = NSLayoutConstraint()

override init(frame: CGRect) {
    super.init(frame:frame)

    self.backgroundColor = UIColor(red: 52/255, green: 49/255,  
 blue: 78/255, alpha: 1)

    makeDropView = makeDropDownView.init(frame: CGRect.init(x: 0, 
y: 0, width: 0, height: 0))
    makeDropView.delegate = self
    makeDropView.translatesAutoresizingMaskIntoConstraints = false


}
override func didMoveToSuperview() {

    self.superview?.addSubview(makeDropView)
    self.superview?.bringSubviewToFront(makeDropView)

    makeDropView.topAnchor.constraint(equalTo: 
self.bottomAnchor).isActive = true
    makeDropView.centerXAnchor.constraint(equalTo: 
self.centerXAnchor).isActive = true
    makeDropView.widthAnchor.constraint(equalTo: 
self.widthAnchor).isActive = true
    height = makeDropView.heightAnchor.constraint(equalToConstant: 
0)
}

var makeisOpen = false
override func touchesBegan(_ touches: Set<UITouch>, with event: 
UIEvent?) {
    if makeisOpen == false {

        makeisOpen = true

        NSLayoutConstraint.deactivate([self.height])

        if self.makeDropView.tableView.contentSize.height > 150 {
        self.height.constant = 150
                self.superview?.bringSubviewToFront(makeDropView)

        } else {
            self.height.constant =
 self.makeDropView.tableView.contentSize.height
        }
        NSLayoutConstraint.activate([self.height])

        UIView.animate(withDuration: 0.5, delay: 0, 
usingSpringWithDamping: 0.5, initialSpringVelocity: 0.5, options: 
.curveEaseInOut, animations: {self.makeDropView.layoutIfNeeded()
              self.makeDropView.center.y += 
self.makeDropView.frame.height / 2
        }, completion: nil)

    } else {
        makeisOpen = false


        NSLayoutConstraint.deactivate([self.height])
        self.height.constant = 0
        NSLayoutConstraint.activate([self.height])

        UIView.animate(withDuration: 0.5, delay: 0, 
usingSpringWithDamping: 0.5,initialSpringVelocity: 0.5, options: 
.curveEaseInOut, animations: {
            self.makeDropView.center.y -= 
self.makeDropView.frame.height / 2
            self.makeDropView.layoutIfNeeded()

        }, completion: nil)
    }
}

func dismissMakeDropDown() {

    makeisOpen = false
    NSLayoutConstraint.deactivate([self.height])
    self.height.constant = 0
    NSLayoutConstraint.activate([self.height])

    UIView.animate(withDuration: 0.5, delay: 0, 
usingSpringWithDamping: 0.5,initialSpringVelocity: 0.5, options:
 .curveEaseInOut, animations: {
        self.makeDropView.center.y -= 
self.makeDropView.frame.height / 2
        self.makeDropView.layoutIfNeeded()

    }, completion: nil)
}

required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}
}





/////Drop Down View Setup
struct Section {
    var make: String
    var model: [String]
}

var Cars = [
    Section(make: "BMW", model: ["A","B","C"]),
    Section(make: "Ford", model: ["D","E","F"]),
    Section(make: "Audi", model: ["G","H","I"]),
    Section(make: "Bentley", model: ["J","K","L"])
]

var carMake = Cars.map({$0.make})

var carModel = Cars.flatMap({$0.model})


 class makeDropDownView: UIView,  
 UITableViewDelegate,UITableViewDataSource {

var dropDownOptions = [String]()

var tableView = UITableView()

var delegate : makeDropDownProtocol!

override init(frame: CGRect) {
    super.init(frame: frame)

    tableView.backgroundColor = UIColor.white
    self.backgroundColor = UIColor.white

    tableView.delegate = self
    tableView.dataSource = self
    tableView.translatesAutoresizingMaskIntoConstraints = false


    self.addSubview(tableView)

    tableView.leftAnchor.constraint(equalTo:   
self.leftAnchor).isActive = true
    tableView.rightAnchor.constraint(equalTo: 
self.rightAnchor).isActive = true
    tableView.topAnchor.constraint(equalTo: 
self.topAnchor).isActive = true
    tableView.bottomAnchor.constraint(equalTo:
 self.bottomAnchor).isActive = true

}

required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

func numberOfSections(in tableView: UITableView) -> Int {
    return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection 
section: Int) -> Int {
    return Cars.map({$0.make}).count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath:
 IndexPath) -> UITableViewCell {
    var cell = UITableViewCell()

    cell.textLabel!.text = dropDownOptions[indexPath.row]
    cell.backgroundColor = UIColor.init(red: 255/255, green: 
160/255, blue: 122/255, alpha: 0.8)
    return cell
}

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: 
IndexPath) {

    self.delegate.makeDropDownPressed(string: 
dropDownOptions[indexPath.row])

}
}

 ///model drop down view setup

class modelDropDownView: UIView, UITableViewDelegate, 
    UITableViewDataSource {

var modelDropDownOptions = [String] ()

var modelTableView = UITableView()

var modelDelegate : modelDropDownProtocol!

override init(frame: CGRect) {
    super.init(frame: frame)

    modelTableView.backgroundColor = UIColor.green
    self.backgroundColor = UIColor.green

    modelTableView.delegate = self
    modelTableView.dataSource = self

    modelTableView.translatesAutoresizingMaskIntoConstraints =   
 false

    self.addSubview(modelTableView)

    modelTableView.leftAnchor.constraint(equalTo: 
self.leftAnchor).isActive = true
    modelTableView.rightAnchor.constraint(equalTo: 
self.rightAnchor).isActive = true
    modelTableView.topAnchor.constraint(equalTo: 
self.topAnchor).isActive = true
    modelTableView.bottomAnchor.constraint(equalTo: 
self.bottomAnchor).isActive = true
}

required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

func numberOfSections(in tableView: UITableView) -> Int {
    return 1
}

func tableView(_ tableView: UITableView, numberOfRowsInSection  
section: Int) -> Int {
    return Cars.flatMap({$0.model}).count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath:
IndexPath) -> UITableViewCell {
    var modelCell = UITableViewCell()

    modelCell.textLabel!.text =
 modelDropDownOptions[indexPath.row]
    modelCell.backgroundColor = UIColor.green

    return modelCell

}

func makeselection(_ tableView: UITableView, didSelectRowAt 
indexPath: IndexPath) {

    self.modelDelegate.modelDropDownPressed(string: 
modelDropDownOptions[indexPath.row])

}
}

希望可以根据我在制造商下拉列表中选择的制造商来过滤模型结果。提前致谢。

最佳答案

您不需要创建两个 UIButton 子类和两个 UIView 子类。您可以创建一个类并创建多个实例。
在选择品牌之前，不要为模型按钮设置 dropDownOptions。
选择品牌后，从所选品牌获取模型并在模型 dropDownOptions 中设置。

只需复制这段代码并运行。有效

/////Drop Down View Setup
struct Section {
    var make: String
    var model: [String]
}

var Cars = [
    Section(make: "BMW", model: ["A","B","C"]),
    Section(make: "Ford", model: ["D","E","F"]),
    Section(make: "Audi", model: ["G","H","I"]),
    Section(make: "Bentley", model: ["J","K","L"])
]

var carMake = Cars.map({$0.make})

class ViewController: UIViewController, DropDownBtnProtocol {
    func optionChanged(_ button: DropDownBtn, string: String) {
        if button == makeButton {
            if let selectedMake = Cars.first(where: { $0.make == string }) {
                modelButton.dropView.dropDownOptions = selectedMake.model
            }
        } else if button == modelButton {

        }
    }

    ////Set up buttons
    var makeButton = DropDownBtn()
    var modelButton = DropDownBtn()


    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .white
        makeButton = DropDownBtn.init(frame: CGRect(x: 0, y: 0, width: 0, height: 0))
        makeButton.delegate = self
        makeButton.setTitle("Select Make", for: .normal)
        makeButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 17)
        makeButton.translatesAutoresizingMaskIntoConstraints = false

        self.view.addSubview(makeButton)


        makeButton.centerXAnchor.constraint(equalTo: self.view.centerXAnchor).isActive = true
        makeButton.centerYAnchor.constraint(equalTo: self.view.centerYAnchor, constant: -300).isActive = true

        makeButton.widthAnchor.constraint(equalToConstant: 450).isActive = true
        makeButton.heightAnchor.constraint(equalToConstant: 50).isActive = true

        makeButton.dropView.dropDownOptions = carMake

        modelButton = DropDownBtn.init(frame: CGRect(x: 0, y: 0, width: 0, height: 0))
        modelButton.delegate = self
        modelButton.setTitle("Select Model", for: .normal)
        modelButton.titleLabel?.font = UIFont.boldSystemFont(ofSize: 17)
        modelButton.translatesAutoresizingMaskIntoConstraints = false

        self.view.addSubview(modelButton)

        modelButton.centerXAnchor.constraint(equalTo: self.view.centerXAnchor).isActive = true
        modelButton.centerYAnchor.constraint(equalTo: self.view.centerYAnchor, constant: -240).isActive = true

        modelButton.widthAnchor.constraint(equalToConstant: 450).isActive = true
        modelButton.heightAnchor.constraint(equalToConstant: 50).isActive = true

    }
}
protocol DropDownBtnProtocol {
    func optionChanged(_ button: DropDownBtn, string: String)
}
class DropDownBtn: UIButton, DropDownViewProtocol {
    func dropDownPressed(string: String) {
        self.setTitle(string, for: .normal)
        self.dismissMakeDropDown()
        delegate.optionChanged(self, string: string)
    }
    var delegate: DropDownBtnProtocol!
    var dropView = DropDownView()
    var height = NSLayoutConstraint()
    override init(frame: CGRect) {
        super.init(frame:frame)
        self.backgroundColor = UIColor(red: 52/255, green: 49/255, blue: 78/255, alpha: 1)
        dropView = DropDownView.init(frame: CGRect.init(x: 0, y: 0, width: 0, height: 0))
        dropView.delegate = self
        dropView.translatesAutoresizingMaskIntoConstraints = false
    }
    override func didMoveToSuperview() {
        self.superview?.addSubview(dropView)
        self.superview?.bringSubviewToFront(dropView)
        dropView.topAnchor.constraint(equalTo: self.bottomAnchor).isActive = true
        dropView.centerXAnchor.constraint(equalTo: self.centerXAnchor).isActive = true
        dropView.widthAnchor.constraint(equalTo: self.widthAnchor).isActive = true
        height = dropView.heightAnchor.constraint(equalToConstant: 0)
    }
    var makeisOpen = false
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        if makeisOpen == false {
            makeisOpen = true
            NSLayoutConstraint.deactivate([self.height])
            if self.dropView.tableView.contentSize.height > 150 {
                self.height.constant = 150
                self.superview?.bringSubviewToFront(dropView)
            } else {
                self.height.constant = self.dropView.tableView.contentSize.height
            }
            NSLayoutConstraint.activate([self.height])
            UIView.animate(withDuration: 0.5, delay: 0,
                           usingSpringWithDamping: 0.5, initialSpringVelocity: 0.5, options:
                           .curveEaseInOut, animations: {self.dropView.layoutIfNeeded()
                    self.dropView.center.y += self.dropView.frame.height / 2
            }, completion: nil)
        } else {
            makeisOpen = false
            NSLayoutConstraint.deactivate([self.height])
            self.height.constant = 0
            NSLayoutConstraint.activate([self.height])
            UIView.animate(withDuration: 0.5, delay: 0,
                           usingSpringWithDamping: 0.5,initialSpringVelocity: 0.5, options:
                           .curveEaseInOut, animations: {
                    self.dropView.center.y -= self.dropView.frame.height / 2
                    self.dropView.layoutIfNeeded()

            }, completion: nil)
        }
    }
    func dismissMakeDropDown() {
        makeisOpen = false
        NSLayoutConstraint.deactivate([self.height])
        self.height.constant = 0
        NSLayoutConstraint.activate([self.height])
        UIView.animate(withDuration: 0.5, delay: 0,
                       usingSpringWithDamping: 0.5,initialSpringVelocity: 0.5, options:
                       .curveEaseInOut, animations: {
                self.dropView.center.y -= self.dropView.frame.height / 2
                self.dropView.layoutIfNeeded()
        }, completion: nil)
    }
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}
protocol DropDownViewProtocol {
    func dropDownPressed(string: String)
}
class DropDownView: UIView, UITableViewDelegate,UITableViewDataSource {

    var dropDownOptions = [String]() {
        didSet {
            tableView.reloadData()
        }
    }
    var tableView = UITableView()
    var delegate : DropDownViewProtocol!

    override init(frame: CGRect) {
        super.init(frame: frame)
        tableView.backgroundColor = UIColor.white
        self.backgroundColor = UIColor.white
        tableView.delegate = self
        tableView.dataSource = self
        tableView.translatesAutoresizingMaskIntoConstraints = false
        self.addSubview(tableView)
        tableView.leftAnchor.constraint(equalTo: self.leftAnchor).isActive = true
        tableView.rightAnchor.constraint(equalTo: self.rightAnchor).isActive = true
        tableView.topAnchor.constraint(equalTo: self.topAnchor).isActive = true
        tableView.bottomAnchor.constraint(equalTo: self.bottomAnchor).isActive = true
    }
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return dropDownOptions.count
    }
    func tableView(_ tableView: UITableView, cellForRowAt indexPath:
        IndexPath) -> UITableViewCell {
        let cell = UITableViewCell()
        cell.textLabel!.text = dropDownOptions[indexPath.row]
        cell.backgroundColor = UIColor.init(red: 255/255, green: 160/255, blue: 122/255, alpha: 0.8)
        return cell
    }
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        self.delegate.dropDownPressed(string: dropDownOptions[indexPath.row])
    }
}

关于arrays - 尝试根据在另一个下拉菜单中选择的值快速过滤一个下拉菜单中的值，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/56101323/

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rxjs - 过滤 BehaviorSubject
我有一个 BehaviorSubject我希望能够filter ，但要保持新订阅者在订阅时始终获得一个值的行为主题式质量，即使最后发出的值被过滤掉。有没有一种简洁的方法可以使用 rxjs 的内置函数来
过滤 RSS 提要以仅显示更受欢迎的链接
我有一个 RSS 提要，每天输出大约 100 篇文章。我希望过滤它以仅包含更受欢迎的链接，也许将其过滤到 50 个或更少。回到当天，我相信您可以使用“postrank”来做到这一点，但在谷歌收购后现已
xslt - XSLT-过滤
我有这样一个重复的xml树- this is a sample xml file yellowred blue greyredblue 如您所见，每个项目可以具有不同数量的颜色标签
Haskell迭代二维列表，过滤，输出一维列表
我以为我在 Haskell 学习中一帆风顺，直到... 我有一个 [[Int]] tiles = [[1,0,0] ,[0,1,0] ,[0,1,0]
javascript - 过滤 observableArray
我在使用 Knockout.js 过滤可观察数组时遇到问题我的js: 包含数据的数组 var docListData = [ { name: "Article Name 1", info:
javascript - Angular 过滤
我在 mongoDB 中有这个架构: var CostSchema = new Schema({ item: String, value: Number }); var Attachm
r - 根据列中的条件对数据框中的行进行子集化/过滤
给定一个数据框“foo”，我如何才能只选择“foo”中的那些行，例如foo$location =“那里”？ foo = data.frame(location = c("here", "there",

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arrays - 尝试根据在另一个下拉菜单中选择的值快速过滤一个下拉菜单中的值