ios - 如何将选定的 UIPickerView 行元素与数组元素进行比较？

Question

import UIKit

class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {


    @IBOutlet weak var categoryFactsPincker: UIPickerView!

    @IBOutlet weak var randomFactLabel: UILabel!

这是我的 UIPickerView 数组

let categoryFactsArray = ["Interesting Facts", "Fun Facts", "Nutrition Facts", "Funny Facts", "Unbelievable Facts", "Did You Know", "Animal Facts", "Mind Blowing Facts", "Weird Facts"]


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

    categoryFactsPincker.delegate = self
    categoryFactsPincker.dataSource = self
}

我想用这个按钮来比较数组元素和选择用于打印不同类别的 UIPickerView

@IBAction func buttonPressed(_ sender: UIButton) {

    if categoryFactsArray[row] == 0 {

        updateInterestingFacts()
    }else if categoryFactsPincker.selectedRow(inComponent: 1){

    }
}

func updateInterestingFacts(){

    let random = interestingFactsArray[Int(arc4random_uniform(UInt32(interestingFactsArray.count)))]

    //        randomFactLabel.text = random

    let alert = UIAlertController(title: "Random Fact", message: "\(random)", preferredStyle: .alert)

    alert.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
    self.present(alert, animated: true)

}

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

    return 1
}

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

    return categoryFactsArray.count
}

func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {

    return categoryFactsArray[row]
}

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {

    categoryFactsArray[row]
}

Answer 1

试试这个

        @IBAction func buttonPressed(_ sender: UIButton) {

    if categoryFactsPincker.selectedRow(inComponent: 0) == 0 {
        updateInterestingFacts()
    }else{
        let categorySelected = categoryFactsArray[categoryFactsPincker.selectedRow(inComponent: 0)]
        print(categorySelected)
    }
}

这个打印应该显示选择的值，所以你可以用来比较，或者任何你需要的