ios - UIPickers 数据不会从 UITextField 显示

Question

我是 Swift 新手，但我觉得我学得很好。

我有四个带有显示 UIPickerViews 的 InputView 的 UITextField，并且我以编程方式将它们放置在应用程序中。我的代码没有显示错误，所有 UIPickerViews 都会弹出(picker、picker2、picker3、picker4)，但只有“climate”中的数组显示在所有四个 View 中。所以我明显的问题是......我到底如何让剩余的数组(环境、区域、预算)显示在他们受人尊敬的 UIPickerViews 中!

另外，侧面请求，我如何禁用文本字段，以便没有人能够将任何内容粘贴到文本字段中

这是我的代码:

import UIKit

class ViewController: UIViewController,UIPickerViewDataSource,UIPickerViewDelegate {

@IBOutlet weak var climateText: UITextField!
@IBOutlet weak var environmentText: UITextField!
@IBOutlet weak var regionText: UITextField!
@IBOutlet weak var budgetText: UITextField!

var picker = UIPickerView()
var picker2 = UIPickerView()
var picker3 = UIPickerView()
var picker4 = UIPickerView()


//MARK: Arrays for PickerViews
var climates = ["Hot","Warm","Cold","Anywhere"]
var environment = ["Beach","City","Mountain","Rural","Anywhere"]
var region = ["Central America","Carribean","Europe","North America","South America","Anywhere"]
var budget = ["$0-500","$501-1000","$1001-1500","$1501-2500","$2501 and up"]


override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    picker.tag = 0
    picker2.tag = 1
    picker3.tag = 2
    picker4.tag = 3

    picker.delegate = self
    picker2.delegate = self
    picker3.delegate = self
    picker4.delegate = self

    picker.dataSource = self
    picker2.dataSource = self
    picker3.dataSource = self
    picker4.dataSource = self

    climateText.inputView = picker
    environmentText.inputView = picker2
    regionText.inputView = picker3
    budgetText.inputView = picker4
}


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


func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    if picker.tag == 0 {
        return climates.count
    } else if picker2.tag == 1 {
        return environment.count
    } else if picker3.tag == 2 {
        return region.count
    } else if picker4.tag == 3 {
        return budget.count
    }
    return 1
}

func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    if picker.tag == 0 {
        return climates[row]
    } else if picker2.tag == 1 {
        return environment[row]
    } else if picker3.tag == 2 {
        return region[row]
    } else if picker4.tag == 3 {
        return budget[row]
    }
    return ""
}


func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    if picker.tag == 0 {
        climateText.text = climates[row]
    } else if picker2.tag == 1 {
        environmentText.text = environment[row]
    } else if picker3.tag == 2 {
        regionText.text = region[row]
    } else if picker4.tag == 3 {
        budgetText.text = budget[row]
    }
}


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


}

Answer 1

我不喜欢使用标签 ( see point 2 here )，但为了解决这个问题，请更改 didSelectRow 函数来执行此操作:

func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    if pickerView.tag == 0 {
        climateText.text = climates[row]
    } else if pickerView.tag == 1 {
        environmentText.text = environment[row]
    } else if pickerView.tag == 2 {
        regionText.text = region[row]
    } else if pickerView.tag == 3 {
        budgetText.text = budget[row]
    }
}

您的问题只是在于您不想从用户刚刚创建的部分的选择器 View 中看到标签。