Question

我是swift的新手，我正在尝试使用另一个类的名称数组重新填充pickerview。我有这个类Notes创建笔记，每个笔记都有一个名称/标题，我试图访问这些名称/标题并将它们放在pickerview中，任何人都可以帮助我。

import UIKit
var allNotes: [Note] = []
var currentNoteindex: Int = -1
var noteTable: UITableView?
let kAllNotes:String = "notes"

class Note: NSObject
{
    var date:String
    var note:String
    var name:String

    override init()
    {
        date = NSDate().description
        name = ""
        note = ""
    }

    func dictionary() -> NSDictionary
    {
        return ["note": note, "date": date, "name": name]
    }

我有两个不同的选择视图，一个工作，只是名称不起作用的那个。

override func viewDidLoad()
{
    super.viewDidLoad()

    fileNamePicker.dataSource = self
    fileNamePicker.delegate = self

    gradePicker.dataSource = self
    gradePicker.delegate = self

}


func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int
{
    if pickerView == gradePicker
    {
        return grades.count
    }
    else
    {
        return allNotes.count
    }

}

func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String?
{
    if pickerView == gradePicker
    {
       return grades[row]
    }

    else
    {
         //This is where the Problem is, but I don't know how to fix it.
        let nameFiles = allNotes[currentNoteindex].name 
        return nameFiles[row]
    }

}

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

Answer 1

nameFiles正在从记事中访问姓名。

nameFiles[row]无法正常工作，因为nameFiles不是数组。

如果要返回字符串，只需执行return nameFiles即可。首先检查以确保nameFiles实际上有值！

Answer 2

看起来你的allNotes数组是空的。你有initilaize但似乎没有追加对象。在initiliaze类

中创建Note方法

init(_ date: String, note: String, name: String) {
        self.date = date
        self.note = note
        self.name = name
    }

在你的viewcontroller类中尝试像这样追加。现在，您可以访问内部选择器视图方法： -

//You can append by doinf iteration based on your data
allNotes.append(Note(date: "value1", note: "Value", name: "name"))

从另一个viewController访问信息

2 个答案: