UIPickerView

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Swift (Programmiersprache)

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//
//  ViewController.swift
//  ByteCoin
//
//  Created by Angela Yu on 11/09/2019.
//  Copyright © 2019 The App Brewery. All rights reserved.
//

import UIKit

class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {

    @IBOutlet weak var bitcoinLabel: UILabel!
    @IBOutlet weak var currencyLabel: UILabel!
    @IBOutlet weak var currencyPicker: UIPickerView! // Outlet for picker
    
    let coinManager = CoinManager()
   
    override func viewDidLoad() {
        super.viewDidLoad()
        // set the ViewController as the datasource for the picker
        currencyPicker.dataSource = self
        // set the ViewController as the delegate for the picker
        currencyPicker.delegate = self
    }
    
    
    //MARK: - UIPickerViewDataSource protocol
    
    // return number of columns of the picker
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }
    
    // return number of rows
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return coinManager.currencyArray.count
    }
    
    //MARK: - UIPickerView delegates

    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        // executed for every row
        return coinManager.currencyArray[row]
    }
    
    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        let selectedCurrency = coinManager.currencyArray[row]
        coinManager.getCoinPrice(for: selectedCurrency)
    }
}