Xcode - 我的两个选择器视图连接在一起如何使它们成为单独的选择器视图？ [重复]

Question

这个问题在这里已有答案：

• How do I use multiple picker views with different data sources in the same view? 2回答

我在一个视图控制器上有两个选择器视图（目前会有更多），当我在一个选择器视图中选择一个东西时，另一个选择器视图会自动更改为我在OTHER选择器视图中选择的值....我该如何让他们两个不同的选择器视图？我尝试为新的选择器视图创建新方法，但这似乎不起作用。我真的很感激任何帮助！提前致谢。

这是我的快速代码：

import UIKit

class AddRatioViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {

    @IBAction func BackToHome(_ sender: Any) {
        self.performSegue(withIdentifier: "BackToHome", sender: self)
    }
    @IBOutlet weak var ChooseDrivingGear: UIPickerView!
    @IBOutlet weak var ChooseDrivingGear2: UIPickerView!

    @IBOutlet weak var chooseBox1: UIButton!
    @IBOutlet weak var chooseBox2: UIButton!


    let drivingGear = ["1", "12", "36", "60", "84"]

    override var shouldAutorotate: Bool {
        return true
    }

    override func viewDidLoad() {
        ChooseDrivingGear.isHidden = true
        ChooseDrivingGear.delegate = self
        ChooseDrivingGear.dataSource = self

        ChooseDrivingGear2.isHidden = true
        ChooseDrivingGear2.delegate = self
        ChooseDrivingGear2.dataSource = self

        super.viewDidLoad()
    }

    @IBAction func chooseBox1Pressed(_ sender: UIButton) {
        sender.isHidden = true                                  //added (to prevent overlap)
        if ChooseDrivingGear.isHidden {
           ChooseDrivingGear.isHidden = false
        }
    }

    @IBAction func chooseBox2Pressed(_ sender: UIButton) {
        sender.isHidden = true                                  //added (to prevent overlap)
        if ChooseDrivingGear2.isHidden {
           ChooseDrivingGear2.isHidden = false
        }
    }
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }

    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return drivingGear[row]
    }

    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return drivingGear.count
    }

    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        chooseBox1.setTitle(drivingGear[row], for: .normal)
        chooseBox2.setTitle(drivingGear[row], for: .normal)
        ChooseDrivingGear.isHidden = true
        chooseBox1.isHidden = false                         //added (to prevent overlap)
        ChooseDrivingGear2.isHidden = true
        chooseBox2.isHidden = false                         //added (to prevent overlap)

    }

    func textFieldShouldBeginEditing(textField: UITextField) -> Bool {
        ChooseDrivingGear.isHidden = false
        ChooseDrivingGear2.isHidden = false
        return false
    }

    //second pickerView

}

Answer 1

之所以发生这种情况，是因为您没有检查选择器视图委托方法中现在更改的选择器视图

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    if pickerView == ChooseDrivingGear {
       //do staf for first picker 
    } else {
       //do staf for second one
    }    
}

或者最好使用标签

    override func viewDidLoad() {
    ChooseDrivingGear.isHidden = true
    ChooseDrivingGear.delegate = self
    ChooseDrivingGear.dataSource = self
    ChooseDrivingGear.tag = 0

    ChooseDrivingGear2.isHidden = true
    ChooseDrivingGear2.delegate = self
    ChooseDrivingGear2.dataSource = self
    ChooseDrivingGear2.tag = 1

    super.viewDidLoad()
}

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    if pickerView.tag == 0 {
       //do staf for first picker 
    } else {
       //do staf for second one
    }    
}

p.s同样在Swift方法和变量应该以小写开头。

Answer 2

在委托方法中，检查pickerView的实例。您可以使用==运算符甚至切换大小写来比较实例

e.g：

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    switch pickerView {
       case firstPickerView: //code here 
       case secondPickerView: //code here 
       default: break
    }

}

确保为所有选择器视图创建插座，并在ViewController中提供，如上所述，例如。 firstPickerView，secondPickerView等