在PickerView IOS Swift 4.2中从服务器加载数据

import UIKit

class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {
    var data: [String] = [] // 存储从服务器加载的数据
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建并配置PickerView
        let pickerView = UIPickerView()
        pickerView.dataSource = self
        pickerView.delegate = self
        
        // 将PickerView添加到视图中
        view.addSubview(pickerView)
        
        // 发送网络请求获取数据
        fetchDataFromServer()
    }
    
    // 从服务器获取数据
    func fetchDataFromServer() {
        guard let url = URL(string: "http://example.com/data") else {
            return
        }
        
        URLSession.shared.dataTask(with: url) { (data, response, error) in
            if let error = error {
                print("Error: \(error)")
                return
            }
            
            if let data = data {
                // 解析服务器返回的数据
                self.data = self.parseData(data)
                
                // 刷新PickerView
                DispatchQueue.main.async {
                    pickerView.reloadAllComponents()
                }
            }
        }.resume()
    }
    
    // 解析服务器返回的数据
    func parseData(_ data: Data) -> [String] {
        // 解析数据的逻辑
        // ...
        
        return ["Option 1", "Option 2", "Option 3"] // 返回解析后的数据
    }
    
    // MARK: - UIPickerViewDataSource
    
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1 // 单列PickerView
    }
    
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return data.count // 返回数据的行数
    }
    
    // MARK: - UIPickerViewDelegate
    
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return data[row] // 返回每个选项的标题
    }
    
    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        // 处理用户选择的逻辑
        // ...
    }
}