进入 uipickerview 的国家列表 swift 3

Question

我用谷歌搜索了如何找到国家/地区列表并尝试在 PickerView 中实施，但我在尝试执行 countries.count 时卡在了这一点上，它给了我一条错误消息：

cannot convert return expression of type 'int' to return type 'string' any suggestions?

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.
    }
}

Answer 1

您需要在方法 numberOfRowsInComponent 中 return 数组计数，在 titleForRow 中您需要 return 数组对象，显示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]
}

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