多个UIPickerView在同一个UIView中 [英] Multiple UIPickerView in the same UIView

问题描述

我是iOS开发人员的完全初学者，我想创建一个小iOS应用程序。在这个应用程序中，3 UIPickerViews 应该显示不同的数据。

I'm a complete beginner on iOS dev and I want to create a little iOS application. On this application, 3 UIPickerViews are supposed to display different data.

我的问题在显示屏上。我习惯在Android或Windows手机上开发，我不明白如何使用不同的数据填充 UIPickerViews 。

My problem is on the display. I'm used to dev on Android or Windows phone and I don't understand how to populate the UIPickerViews with different data.

这是我已编写的代码：

//
//  ViewController.swift
//  iphoneVersion
//
//  Created by fselva on 13/05/2015.
//  Copyright (c) 2015 fselva. All rights reserved.
//

import UIKit



class ViewController: UIViewController, UIPickerViewDelegate{



@IBOutlet weak var pickerView1: UIPickerView!
@IBOutlet weak var pickerView2: UIPickerView!
@IBOutlet weak var pickerView3: UIPickerView!

var test = ["Todo","Waiting","Maybe","Inbox","Note"]

var test2 = ["@Office","@Computer","@Home","@Meeting", "@Read", "@Achat", "@Call"]



override func viewDidLoad() {
    super.viewDidLoad()
    pickerView1.tag = 1
    pickerView2.tag = 2
    pickerView3.tag = 3
    // Do any additional setup after loading the view, typically from a nib.
}

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

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

func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int{
    if pickerView2.tag == 2 {
        return test.count
    } else if pickerView3 == 3{
        return test2.count
    }
    return 1
}

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

    if pickerView2 == 2 {
        return test[row]
    } else if pickerView3 == 3{
        return test2[row]
    }
        return ""
}


}

@IBOutlet weak var pickerView1：UIPickerView！已经通过Ctrl + Click从故事板自动创建到ViewController.swift。

@IBOutlet weak var pickerView1: UIPickerView!has been automatically created by Ctrl+Click from the storyboard to the ViewController.swift.

第一个 UIPickerView 目前应该什么都不显示。第二个应该显示 test ，第三个显示 test2 。

The first UIPickerView is currently supposed to display nothing. The second one is supposed to display test and the third one displays test2.

在互联网上经过数小时的调查后，我听说过标签来定义谁必须展示什么，但它不起作用。

After hours of investigation on internet, I have heard about tags to define who must display what, but it doesn't work.

我做错了什么，我错过了什么地方吗？

Am I doing something wrong, am I missing something somewhere?

推荐答案

你不需要标签，只需使用：

You don't need tags, just use:

 func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int{
        if pickerView == pickerView1 {
            //pickerView1
        } else if pickerView == pickerView2{
           //pickerView2
        }

也不要忘记在IB或代码中设置委托：

also don't forget to set delegate in IB or in code:

pickerView1.delegate = self

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