如何使用 Swift 3 UIPickerView 引用多行？答案

【问题标题】：How to reference multiple rows with Swift 3 UIPickerView?如何使用 Swift 3 UIPickerView 引用多行？
【发布时间】：2016-11-13 09:27:50
【问题描述】：

如何在标签中显示“Lamborghini and White”？

我正在尝试弄清楚如何在每列中独立引用选定的行。

import UIKit

class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {

@IBOutlet var titlelbl: UILabel!
@IBOutlet var pickerView: UIPickerView!

var cars = [["BMW","Lamborghini","Range Rover", "Bentley",     "Maserati", "Rolls Royce"],["Blue","Green","White"]]

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    pickerView.delegate = self
    pickerView.dataSource = self
}


func numberOfComponents(in pickerView: UIPickerView) -> Int {
    return 2
}

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

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

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    titlelbl.text = "\(cars[0][row]) and \(cars[1][row])"
}
   }

【问题讨论】：

标签： swift3 uipickerview

【解决方案1】：

想通了，

import UIKit

class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {

    @IBOutlet var titlelbl: UILabel!
    @IBOutlet var pickerView: UIPickerView!

    var cars = [["BMW","Lamborghini","Range Rover", "Bentley", "Maserati", "Rolls Royce"],["Blue","Green","White"]]

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

    }


    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 2
    }

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

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

    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        let selectedValue1 = pickerView.selectedRow(inComponent: 0)
        let selectedValue2 = pickerView.selectedRow(inComponent: 1)

       titlelbl.text = "\(cars[0][selectedValue1]) and \(cars[1][selectedValue2])"

    }

}

【讨论】：

【解决方案2】：

[ func numberOfComponents(in pickerView: UIPickerView) -> Int { 返回 2 }

func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {

    if component == 0{
       return bloodgroup.count
    }
    else if component == 1 {
       return districk.count
    }
    return 1
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    if component == 0{
        return bloodgroup[row]
    }
    else if component == 1 {
        return districk[row]
    }
   return ""

}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    if component == 0{
        print(bloodgroup[row])
    }
    else if component == 1 {
        print(districk[row])
    }

}

【讨论】：