在swift中使用UIPickerView和多个组件

Question

嗨,我一直试图让这个工作多年没有成功,所以道歉,如果这对你们来说似乎很容易.

我想使用3轮UIPickerView - 第一轮didSelectRow值将用于更改剩余两个轮子的阵列,但它们将与转换应用程序相同.

当填充轮子说Anyobject与String不相同时,它似乎给我一个错误.我看不出有什么不对,但我知道这是我错过的基本内容.

任何指针都将非常感激.

Motty.

//  ViewController.swift
//  picker test

import UIKit

class ViewController: UIViewController, UIPickerViewDelegate {

    @IBOutlet weak var picker1Label: UILabel!
    @IBOutlet weak var picker2Label: UILabel!

    @IBOutlet weak var bigPicker: UIPickerView!

    var wheelContents = []
    var length = ["metres","feet","yards","inches","mm","cm","miles"]
    var volume = ["m3","US Gall","Imp Gall","Barrels", "cubic FT","litres"]
    var conType = ["length","volume"]


    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        wheelContents = [conType,length,length]

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


    //For main selection of type of conversion
    // returns the number of 'columns' to display.
    func numberOfComponentsInPickerView(bigPicker: UIPickerView) -> Int{

        return wheelContents.count

    }

    // returns the # of rows in each component..
    func pickerView(bigPicker: UIPickerView, numberOfRowsInComponent component: Int) -> Int{

        return wheelContents[component].count


    }

    func pickerView(bigPicker: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String!{

        return wheelContents[component][row]

    }
}

Answer 1

你需要告诉 Swift 你的wheelContents数组是一个数组的数组String：

var wheelContents:[[String]] = []

如果你没有明确给出wheelContents一个类型，Swift 会推断出它NSArray是什么给你带来了问题。