从Enum中获取数据以显示在UIPickerView上 [英] Take data from Enum to show on UIPickerView

问题描述

我正在创建一个简单的View，其中有一个UIPickerView，我想从枚举中显示PickerView上的选择。我创建了一个可能的饮料的枚举

I am creating a simple View where there is a UIPickerView and I want to display the choices on the PickerView from an enum. I have created an enum of possible drinks

enum drink{
  case coffee
  case tea
  case cola
  case water
}

我想知道可以在UIPickerView中显示饮料？我正在使用Swift 1.2和Xcode 6.3.1 ..谢谢！ ：）

I was wondering how it would be possible to display the drinks in an UIPickerView? I am using Swift 1.2 and Xcode 6.3.1.. Thanks!! :)

推荐答案

如 ABakerSmith 所述，您可以使用可打印协议在 UIPickerView 中显示 String 。

As mentioned by ABakerSmith you can use the Printable protocol to display the String in the UIPickerView.

在最后，您可以拥有一个 ViewController ，如下所示：

In the end you can have a ViewController looking as the following:

//
//  ViewController.swift
//  Test
//
//  Created by Stefan Veis Pennerup on 04/05/15.
//  Copyright (c) 2015 Kumuluzz. All rights reserved.
//

import UIKit

class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {

@IBOutlet weak var pickerView: UIPickerView!

enum Drink: Int, Printable {
    case Coffee = 0
    case Tea = 1
    case Cola = 2
    case Water = 3
    static var count: Int { return Drink.Water.rawValue + 1 }

    var description: String {
        switch self {
        case .Coffee: return "Coffee"
        case .Tea   : return "Tea"
        case .Cola  : return "Cola"
        case .Water : return "Water"
        default: return ""
        }
    }
}

// MARK: - UIPickerViewDataSource

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

func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return Drink.count
}

// MARK: - UIPickerViewDelegate

func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
    return Drink(rawValue: row)?.description;
}

// several optional methods:

// func pickerView(pickerView: UIPickerView!, widthForComponent component: Int) -> CGFloat

// func pickerView(pickerView: UIPickerView!, rowHeightForComponent component: Int) -> CGFloat

// func pickerView(pickerView: UIPickerView!, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString!

// func pickerView(pickerView: UIPickerView!, viewForRow row: Int, forComponent component: Int, reusingView view: UIView!) -> UIView!

// func pickerView(pickerView: UIPickerView!, didSelectRow row: Int, inComponent component: Int)
}

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