用 json GET 创建的先前数组填充 UiPickerView（我得到“？”而不是数据）

Posted 2023-02-24

【中文标题】用 json GET 创建的先前数组填充 UiPickerView（我得到“？”而不是数据）

【英文标题】：fill the UiPickerView with a previous array created with json GET ( i get '?' instead the data)

【发布时间】：2015-02-18 15:53:00

【问题描述】：

当我尝试在 UiPickerView 中显示数组时遇到问题，我在控制台中检查数组数据（来自 json），数据在那里，但是当我尝试填充选择器时，我得到了'？ ' （数组的每一行 1 个）

这是我的代码

import UIKit

类 ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate

@IBOutlet var NameLabel: UILabel!

@IBOutlet var myPicker: UIPickerView!

var pickerData = [String]()




@IBAction func Butonio(sender: AnyObject) 

    var urlPath: String = "link with json encode response"
    //self.NameLabel.text = urlPath;

    var url: NSURL = NSURL(string: urlPath)!
    var request1: NSURLRequest = NSURLRequest(URL: url)
    let queue:NSOperationQueue = NSOperationQueue()
    NSURLConnection.sendAsynchronousRequest(request1, queue: queue, completionHandler: (response: NSURLResponse!, data: NSData!, error: NSError!) -> Void in
        var err: NSError?
       // println(data)


        if let json =  NSJSONSerialization.JSONObjectWithData(data, options: .MutableLeaves, error:
        &err) as? NSArray

        if let descripcion = json[0]["descripcion"] as? NSString 

            let descripcion2 = NSUUID().UUIDString

            var descripcion3 = UIDevice.currentDevice().identifierForVendor.UUIDString
            let stringo : Int = json.count
             println( "el nmuero es \(stringo)")

           var stringc = ""
           // NSArray colors = [[Int:String]]()
            //var pickerData = [String]()

           var j = 0
            while j == 0

                if self.pickerData.isEmpty
                j=1
                 else 
                self.pickerData.removeLast()
                
            

                for i in  0..<stringo
                if let descr =  json[i]["descripcion"] as? NSString
               //println( "la desc es \(descr)")
               //colors[i] = descr
                //var colors: [Int:String] = [i : descr]
                self.pickerData.append(descr)
                stringc += self.pickerData[i]+" , "
               println( "la desc/  es \(self.pickerData[i])")
                    

            

            self.myPicker.dataSource = self
            self.myPicker.delegate = self


            self.myPicker.reloadAllComponents()



            println( "la desc/total  es \(stringc)")

            return


            


        

    )






//MARK: - Delegates and data sources
//MARK Data Sources

func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int 
    return 1


func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int 
    return self.pickerData.count



//MARK Delegate
func pickerView(pickerView: UIPickerView, tittleForRow row: Int, forComponet component: Int) -> String!
     //println(row)
    return self.pickerData[row]


func pickerView(pickerView: UIPickerView, didSelectRow row: Int, forComponet component: Int) 
   //println(row)
  println( "la desc/  es \(self.pickerData[row])")
    // self.NameLabel.text = self.pickerData[row]

【问题讨论】：

除此之外，我无法让最后一部分工作“func pickerView(pickerView: UIPickerView, didSelectRow row: Int, forComponet component: Int) println("la desc/es (self. pickerData[row])") " 但我不知道它是否不起作用，因为我无法使 uipickerview 正常工作或在某些时候出错

【参考方案1】：

委托和数据源函数有一些问题，这是使用它们的正确方法

func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int
    return 1


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


func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! 
    return pickerData[row]


func pickerView(pickerView: UIPickerView!, didSelectRow row: Int, inComponent component: Int)
    NameLabel.text = pickerData[row]
    self.view.endEditing(true)