UIPickers 数据不会从 UITextField 显示

Question

我是 Swift 的新手，但我觉得我掌握得很好。

我有四个带有 InputView 的 UITextField 显示 UIPickerViews，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），但只有来自"climate"的数组显示在所有四个视图中。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，附带请求，我将如何禁用文本字段，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（请参阅此处的第 2 点），但为了让您解决此问题，请更改您的 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]
    }
}

您的问题只是您不希望从用户刚刚创建部分的选取器视图中查看标记。