进入uipickerview swift 3的国家列表

Posted 2023-02-24

【中文标题】进入uipickerview swift 3的国家列表

【英文标题】：list of countries into uipickerview swift 3

【发布时间】：2016-11-25 04:42:07

【问题描述】：

我在 Google 上搜索了如何找到国家/地区列表并尝试将其实施到 PickerView，但我被困在我尝试执行 countries.count 的这一点上，它给了我一个错误提示：

无法将“int”类型的返回表达式转换为“字符串”类型 有什么建议吗？

import UIKit

class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate
    @IBOutlet weak var pickerValue: UIPickerView!

    let countries = NSLocale.isoCountryCodes.map  (code:String) -> String in
        let id = NSLocale.localeIdentifier(fromComponents: [NSLocale.Key.countryCode.rawValue: code])
        return NSLocale(localeIdentifier: "en_US").displayName(forKey: NSLocale.Key.identifier, value: id) ?? "Country not found for code: \(code)"
    

    func numberOfComponents(in pickerView: UIPickerView) -> Int 
        return 1
    

    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? 
        return countries.count
    

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

    override func didReceiveMemoryWarning() 
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    

【参考方案1】：

您需要在方法numberOfRowsInComponent 中返回数组计数，在titleForRow 中您需要返回数组对象，表明它将显示在选择器中。

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


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